local config = require 'config'

TEST 'nil' [[
local <?t?> = nil
]]

TEST 'string' [[
local <?var?> = '111'
]]

TEST 'boolean' [[
local <?var?> = true
]]

TEST 'integer' [[
local <?var?> = 1
]]

TEST 'number' [[
local <?var?> = 1.0
]]

TEST 'unknown' [[
local <?var?>
]]

TEST 'unknown' [[
local <?var?>
var = y
]]

TEST 'any' [[
function f(<?x?>)
    
end
]]

TEST 'any' [[
function f(<?x?>)
    x = 1
end
]]

TEST 'string' [[
local var = '111'
t.<?x?> = var
]]

TEST 'string' [[
local <?var?>
var = '111'
]]

TEST 'string' [[
local var
<?var?> = '111'
]]

TEST 'string' [[
local var
var = '111'
print(<?var?>)
]]

TEST 'function' [[
function <?xx?>()
end
]]

TEST 'function' [[
local function <?xx?>()
end
]]

TEST 'function' [[
local xx
<?xx?> = function ()
end
]]

TEST 'table' [[
local <?t?> = {}
]]

TEST 'unknown' [[
<?x?>()
]]

TEST 'boolean' [[
<?x?> = not y
]]

TEST 'integer' [[
<?x?> = #y
]]

TEST 'integer' [[
<?x?> = #'aaaa'
]]

TEST 'integer' [[
<?x?> = #{}
]]

TEST 'number' [[
<?x?> = - y
]]

TEST 'number' [[
<?x?> = - 1.0
]]

TEST 'integer' [[
<?x?> = ~ y
]]

TEST 'integer' [[
<?x?> = ~ 1
]]

TEST 'boolean' [[
<?x?> = 1 < 2
]]

TEST 'integer' [[
local a = true
local b = 1
<?x?> = a and b
]]

TEST 'integer' [[
local a = false
local b = 1
<?x?> = a or b
]]

TEST 'boolean' [[
<?x?> = a == b
]]

TEST 'unknown' [[
<?x?> = a << b
]]

TEST 'integer' [[
<?x?> = 1 << 2
]]

TEST 'integer' [[
local a = 1 << 20
local <?b?> = a << 1
]]

TEST 'integer' [[
local a = 1 << 20
local <?b?> = (a << 1) - 1
]]

TEST 'unknown' [[
<?x?> = a .. b
]]

TEST 'string' [[
<?x?> = 'a' .. 'b'
]]

TEST 'string' [[
<?x?> = 'a' .. 1
]]

TEST 'string' [[
<?x?> = 'a' .. 1.0
]]

TEST 'unknown' [[
<?x?> = a + b
]]

TEST 'number' [[
<?x?> = 1 + 2.0
]]

TEST 'integer' [[
<?x?> = 1 + 2
]]

TEST 'integer' [[
---@type integer
local a

<?x?> = - a
]]

TEST 'number' [[
local a

<?x?> = - a
]]

TEST 'unknown' [[
<?x?> = 1 + X
]]

TEST 'unknown' [[
<?x?> = 1.0 + X
]]

TEST 'tablelib' [[
---@class tablelib
table = {}

<?table?>()
]]

TEST 'string' [[
_VERSION = 'Lua 5.4'

<?x?> = _VERSION
]]

TEST 'function' [[
---@class stringlib
local string

string.xxx = function () end

return ('x').<?xxx?>
]]

TEST 'function' [[
---@class stringlib
String = {}

String.xxx = function () end

return ('x').<?xxx?>
]]

TEST 'function' [[
---@class stringlib
local string

string.xxx = function () end

<?x?> = ('x').xxx
]]

TEST 'function' [[
---@class stringlib
local string

string.xxx = function () end

_VERSION = 'Lua 5.4'

<?x?> = _VERSION.xxx
]]

TEST 'table' [[
<?x?> = setmetatable({})
]]

TEST 'integer' [[
local function x()
    return 1
end
<?y?> = x()
]]

TEST 'integer|nil' [[
local function x()
    return 1
    return nil
end
<?y?> = x()
]]

TEST 'unknown|nil' [[
local function x()
    return a
    return nil
end
<?y?> = x()
]]

TEST 'unknown|nil' [[
local function x()
    return nil
    return f()
end
<?y?> = x()
]]

TEST 'unknown|nil' [[
local function x()
    return nil
    return f()
end
_, <?y?> = x()
]]

TEST 'integer' [[
local function x()
    return 1
end
_, <?y?> = pcall(x)
]]

TEST 'integer' [[
function x()
    return 1
end
_, <?y?> = pcall(x)
]]

TEST 'integer' [[
local function x()
    return 1
end
_, <?y?> = xpcall(x)
]]

-- A declared function without returns leaves nothing to take the second result from, but
-- `pcall` still has one of its own: the error value.
TEST 'any' [[
---@type fun()
local x
_, <?y?> = pcall(x)
]]

TEST 'any' [[
---@type fun()
local x
_, <?y?> = xpcall(x, debug.traceback)
]]

TEST 'A' [[
---@class A

---@return A
local function f2() end

local function f()
    return f2()
end

local <?x?> = f()
]]

-- 不根据调用者的输入参数来推测
--TEST 'number' [[
--local function x(a)
--    return <?a?>
--end
--x(1)
--]]

--TEST 'table' [[
--setmetatable(<?b?>)
--]]

-- 不根据对方函数内的使用情况来推测
TEST 'unknown' [[
local function x(a)
    _ = a + 1
end
local b
x(<?b?>)
]]

TEST 'unknown' [[
local function x(a, ...)
    local _, <?b?>, _ = ...
end
x(nil, 'xx', 1, true)
]]

-- 引用不跨越参数
TEST 'unknown' [[
local function x(a, ...)
    return true, 'ss', ...
end
local _, _, _, <?b?>, _ = x(nil, true, 1, 'yy')
]]

TEST 'nil' [[
local <?k?>, <?v?> = next()
local <?k?>, <?v?> = next({})
]]

TEST 'integer?' [[
local <?k?>, <?v?> = next({1})
]]

TEST 'integer?' [[
local a
local <?k?>, v = next({a})
]]

-- probably explicit unknown generic should be unknown
TEST 'nil' [[
local a
local k, <?v?> = next({a})
]]

TEST 'unknown' [[
---@generic T
---@param t T?
---@return T
local function F(t) end
local <?x?> = F()
]]

TEST 'unknown' [[
local a, b
function a()
    return b()
end
function b()
    return a()
end
local <?x?> = a()
]]

TEST 'class' [[
---@class class
local <?x?>
]]

TEST 'string' [[
---@class string

---@type string
local <?x?>
]]

TEST '1' [[
---@type 1
local <?v?>
]]

TEST 'string[]' [[
---@class string

---@type string[]
local <?x?>
]]

TEST 'string|table' [[
---@class string
---@class table

---@type string | table
local <?x?>
]]

TEST [['enum1'|'enum2']] [[
---@type 'enum1' | 'enum2'
local <?x?>
]]

TEST [["enum1"|"enum2"]] [[
---@type "enum1" | "enum2"
local <?x?>
]]

config.set(nil, 'Lua.hover.expandAlias', false)
TEST 'A' [[
---@alias A 'enum1' | 'enum2'

---@type A
local <?x?>
]]

TEST 'A' [[
---@alias A 'enum1' | 'enum2' | A

---@type A
local <?x?>
]]

TEST 'A' [[
---@alias A 'enum1' | 'enum2' | B

---@type A
local <?x?>
]]
config.set(nil, 'Lua.hover.expandAlias', true)
TEST [['enum1'|'enum2']] [[
---@alias A 'enum1' | 'enum2'

---@type A
local <?x?>
]]

TEST [['enum1'|'enum2']] [[
---@alias A 'enum1' | 'enum2' | A

---@type A
local <?x?>
]]

TEST [['enum1'|'enum2'|B]] [[
---@alias A 'enum1' | 'enum2' | B

---@type A
local <?x?>
]]

TEST '1|true' [[
---@alias A 1 | true

---@type A
local <?x?>
]]

TEST 'fun()' [[
---@type fun()
local <?x?>
]]

TEST 'fun(a: string, b: any, ...any)' [[
---@type fun(a: string, b, ...)
local <?x?>
]]

TEST 'fun(a: string, b: any, c?: boolean, ...any):c, d?, ...unknown' [[
---@type fun(a: string, b, c?: boolean, ...):c, d?, ...
local <?x?>
]]

TEST '{ [string]: string }' [[
---@type { [string]: string }
local <?x?>
]]

TEST 'table<string, number>' [[
---@class string
---@class number

---@type table<string, number>
local <?x?>
]]

TEST 'A<string, number>' [[
---@class A

---@type A<string, number>
local <?x?>
]]

TEST 'string' [[
---@class string

---@type string[]
local x
local <?y?> = x[1]
]]

TEST 'string' [[
---@class string

---@return string[]
local function f() end
local x = f()
local <?y?> = x[1]
]]

TEST 'table' [[
local t = {}
local <?v?> = setmetatable(t)
]]

TEST 'CCC' [[
---@class CCC

---@type table<string, CCC>
local t = {}

print(t.<?a?>)
]]

TEST [['aaa'|'bbb']] [[
---@type table<string, 'aaa'|'bbb'>
local t = {}

print(t.<?a?>)
]]

TEST 'integer' [[
---@generic K
---@type fun(a?: K):K
local f

local <?n?> = f(1)
]]

TEST 'unknown' [[
---@generic K
---@type fun(a?: K):K
local f

local <?n?> = f(nil)
]]

TEST 'unknown' [[
---@generic K
---@type fun(a: K|integer):K
local f

local <?n?> = f(1)
]]

TEST 'integer' [[
---@class integer

---@generic T: table, V
---@param t T
---@return fun(table: V[], i?: integer):integer, V
---@return T
---@return integer i
local function ipairs() end

for <?i?> in ipairs() do
end
]]

TEST 'table<string, boolean>' [[
---@generic K, V
---@param t table<K, V>
---@return K
---@return V
local function next(t) end

---@type table<string, boolean>
local t
local k, v = next(<?t?>)
]]

TEST 'string' [[
---@class string

---@generic K, V
---@param t table<K, V>
---@return K
---@return V
local function next(t) end

---@type table<string, boolean>
local t
local <?k?>, v = next(t)
]]

TEST 'boolean' [[
---@class boolean

---@generic K, V
---@param t table<K, V>
---@return K
---@return V
local function next(t) end

---@type table<string, boolean>
local t
local k, <?v?> = next(t)
]]

TEST 'boolean' [[
---@generic K
---@type fun(arg: K):K
local f

local <?r?> = f(true)
]]

TEST 'string' [[
---@class string

---@generic K, V
---@type fun(arg: table<K, V>):K, V
local f

---@type table<string, boolean>
local t

local <?k?>, v = f(t)
]]

TEST 'boolean' [[
---@class boolean

---@generic K, V
---@type fun(arg: table<K, V>):K, V
local f

---@type table<string, boolean>
local t

local k, <?v?> = f(t)
]]

TEST 'fun()' [[
---@return fun()
local function f() end

local <?r?> = f()
]]

TEST 'table<string, boolean>' [[
---@return table<string, boolean>
local function f() end

local <?r?> = f()
]]

TEST 'string' [[
---@class string

---@generic K, V
---@return fun(arg: table<K, V>):K, V
local function f() end

local f2 = f()

---@type table<string, boolean>
local t

local <?k?>, v = f2(t)
]]

TEST 'fun(a: <V>):integer, <V>' [[
---@generic K, V
---@param a K
---@return fun(a: V):K, V
local function f(a) end

local <?f2?> = f(1)
]]

TEST 'integer' [[
---@generic K, V
---@param a K
---@return fun(a: V):K, V
local function f(a) end

local f2 = f(1)
local <?i?>, v = f2(true)
]]

TEST 'boolean' [[
---@generic K, V
---@param a K
---@return fun(a: V):K, V
local function f(a) end

local f2 = f(1)
local i, <?v?> = f2(true)
]]

TEST 'fun(table: table<K, V>, index?: <K>):<K>, <V>' [[
---@generic T: table, K, V
---@param t T
---@return fun(table: table<K, V>, index?: K):K, V
---@return T
---@return nil
local function pairs(t) end

local <?next?> = pairs(dummy)
]]

TEST 'string' [[
---@generic T: table, K, V
---@param t T
---@return fun(table: table<K, V>, index?: K):K, V
---@return T
---@return nil
local function pairs(t) end

local next = pairs(dummy)

---@type table<string, boolean>
local t
local <?k?>, v = next(t)
]]

TEST 'boolean' [[
---@generic T: table, K, V
---@param t T
---@return fun(table: table<K, V>, index?: K):K, V
---@return T
---@return nil
local function pairs(t) end

local next = pairs(dummy)

---@type table<string, boolean>
local t
local k, <?v?> = next(t)
]]

TEST 'string' [[
---@generic T: table, K, V
---@param t T
---@return fun(table: table<K, V>, index?: K):K, V
---@return T
---@return nil
local function pairs(t) end

local next = pairs(dummy)

---@type table<string, boolean>
local t
local <?k?>, v = next(t, nil)
]]

TEST 'boolean' [[
---@generic T: table, K, V
---@param t T
---@return fun(table: table<K, V>, index?: K):K, V
---@return T
---@return nil
local function pairs(t) end

local next = pairs(dummy)

---@type table<string, boolean>
local t
local k, <?v?> = next(t, nil)
]]

TEST 'string' [[
---@generic T: table, K, V
---@param t T
---@return fun(table: table<K, V>, index?: K):K, V
---@return T
---@return nil
local function pairs(t) end

local next = pairs(dummy)

---@type table<string, boolean>
local t

for <?k?>, v in next, t do
end
]]

TEST 'boolean' [[
---@class boolean

---@generic T: table, K, V
---@param t T
---@return fun(table: table<K, V>, index?: K):K, V
---@return T
local function pairs(t) end

local f = pairs(t)

---@type table<string, boolean>
local t

for k, <?v?> in f, t do
end
]]

TEST 'string' [[
---@generic T: table, K, V
---@param t T
---@return fun(table: table<K, V>, index?: K):K, V
---@return T
local function pairs(t) end

---@type table<string, boolean>
local t

for <?k?>, v in pairs(t) do
end
]]

TEST 'boolean' [[
---@generic T: table, K, V
---@param t T
---@return fun(table: table<K, V>, index: K):K, V
---@return T
---@return nil
local function pairs(t) end

---@type table<string, boolean>
local t

for k, <?v?> in pairs(t) do
end
]]

TEST 'boolean' [[
---@generic T: table, V
---@param t T
---@return fun(table: V[], i?: integer):integer, V
---@return T
---@return integer i
local function ipairs(t) end

---@type boolean[]
local t

for _, <?v?> in ipairs(t) do
end
]]

TEST 'boolean' [[
---@generic T: table, V
---@param t T
---@return fun(table: V[], i?: integer):integer, V
---@return T
---@return integer i
local function ipairs(t) end

---@type table<integer, boolean>
local t

for _, <?v?> in ipairs(t) do
end
]]

TEST 'boolean' [[
---@generic T: table, V
---@param t T
---@return fun(table: V[], i?: integer):integer, V
---@return T
---@return integer i
local function ipairs(t) end

---@class MyClass
---@field [integer] boolean
local t

for _, <?v?> in ipairs(t) do
end
]]

TEST '<T>' [[
---@generic T: table, V
---@param t T
---@return fun(table: V[], i?: integer):integer, V
---@return T
---@return integer i
local function ipairs(t) end

---@class list<T>
---@field [integer] T

---@generic T
---@param self list<T>
function list:foo()
    for _, <?v?> in ipairs(self) do
    end
end
]]

TEST '<T>' [[
---@generic T: table, V
---@param t T
---@return fun(table: V[], i?: integer):integer, V
---@return T
---@return integer i
local function ipairs(t) end

---@class listB<T>: {[integer]:T}

---@generic T
---@param self listB<T>
function listB:foo()
    for _, <?v?> in ipairs(self) do
    end
end
]]

TEST 'boolean' [[
---@generic T: table, K, V
---@param t T
---@return fun(table: table<K, V>, index: K):K, V
---@return T
---@return nil
local function pairs(t) end

---@type boolean[]
local t

for k, <?v?> in pairs(t) do
end
]]

TEST 'integer' [[
---@generic T: table, K, V
---@param t T
---@return fun(table: table<K, V>, index?: K):K, V
---@return T
local function pairs(t) end

---@type boolean[]
local t

for <?k?>, v in pairs(t) do
end
]]

TEST 'E' [[
---@class A
---@class B: A
---@class C: B
---@class D: C

---@class E: D
local m

function m:f()
    return <?self?>
end
]]

TEST 'Cls' [[
---@class Cls
local Cls = {}

---@generic T
---@param self T
---@return T
function Cls.new(self) return self end

local <?test?> = Cls:new()
]]

TEST 'Cls' [[
---@class Cls
local Cls = {}

---@generic T
---@param self T
---@return T
function Cls:new() return self end

local <?test?> = Cls:new()
]]

TEST 'Cls' [[
---@class Cls
local Cls = {}

---@generic T
---@param self T
---@return T
function Cls.new(self) return self end

local <?test?> = Cls.new(Cls)
]]

TEST 'Cls' [[
---@class Cls
local Cls = {}

---@generic T
---@param self T
---@return T
function Cls:new() return self end

local <?test?> = Cls.new(Cls)
]]

TEST 'Rct' [[
---@class Obj
local Obj = {}

---@generic T
---@param self T
---@return T
function Obj.new(self) return self end


---@class Pnt:Obj
local Pnt = {x = 0, y = 0}


---@class Rct:Pnt
local Rct = {w = 0, h = 0}


local <?test?> = Rct.new(Rct)

-- local test = Rct:new()

return test
]]

TEST 'function' [[
string.gsub():gsub():<?gsub?>()
]]

config.set(nil, 'Lua.hover.enumsLimit', 5)
TEST [['a'|'b'|'c'|'d'|'e'...(+5)]] [[
---@type 'a'|'b'|'c'|'d'|'e'|'f'|'g'|'h'|'i'|'j'
local <?t?>
]]

config.set(nil, 'Lua.hover.enumsLimit', 1)
TEST [['a'...(+9)]] [[
---@type 'a'|'b'|'c'|'d'|'e'|'f'|'g'|'h'|'i'|'j'
local <?t?>
]]

config.set(nil, 'Lua.hover.enumsLimit', 0)
TEST '...(+10)' [[
---@type 'a'|'b'|'c'|'d'|'e'|'f'|'g'|'h'|'i'|'j'
local <?t?>
]]

config.set(nil, 'Lua.hover.enumsLimit', 5)

TEST 'string|fun():string' [[
---@type string | fun(): string
local <?t?>
]]

TEST 'string' [[
local valids = {
    ['Lua 5.1'] = false,
    ['Lua 5.2'] = false,
    ['Lua 5.3'] = false,
    ['Lua 5.4'] = false,
    ['LuaJIT']  = false,
}

for <?k?>, v in pairs(valids) do
end
]]

TEST 'boolean' [[
local valids = {
    ['Lua 5.1'] = false,
    ['Lua 5.2'] = false,
    ['Lua 5.3'] = false,
    ['Lua 5.4'] = false,
    ['LuaJIT']  = false,
}

for k, <?v?> in pairs(valids) do
end
]]

TEST 'string' [[
local t = {
    a = 1,
    b = 1,
}

for <?k?>, v in pairs(t) do
end
]]

TEST 'integer' [[
local t = {'a', 'b'}

for <?k?>, v in pairs(t) do
end
]]

TEST 'string' [[
local t = {'a', 'b'}

for k, <?v?> in pairs(t) do
end
]]

TEST 'fun():number, boolean' [[
---@type fun():number, boolean
local <?t?>
]]


TEST 'fun(value: Class)' [[
---@class Class

---@param callback fun(value: Class)
function work(callback)
end

work(<?function?> (value)
end)
]]

TEST 'Class' [[
---@class Class

---@param callback fun(value: Class)
function work(callback)
end

work(function (<?value?>)
end)
]]

TEST 'fun(value: Class)' [[
---@class Class

---@param callback fun(value: Class)
function work(callback)
end

pcall(work, <?function?> (value)
end)
]]

TEST 'Class' [[
---@class Class

---@param callback fun(value: Class)
function work(callback)
end

xpcall(work, debug.traceback, function (<?value?>)
end)
]]

config.set(nil, "Lua.type.inferParamType", true)

TEST 'Class' [[
---@class Class

---@param callback fun(value: Class)
function work(callback) end

local function cb(<?value?>) end
work(cb)
]]

TEST 'any' [[
---@class Class

---@param callback fun(value: Class)
function work(callback) end

---@param value any
local function cb(<?value?>) end
work(cb)
]]

TEST 'any' [[
---@class Class

function work(callback) end

local function cb(<?value?>) end
work(cb)
]]

TEST 'string' [[
---@class Class

function work(callback) end

---@param value string
local function cb(<?value?>) end
work(cb)
]]


TEST 'Parent' [[
---@class Parent
local Parent

---@generic T
---@param self T
---@param callback fun(self: T)
function Parent:work(callback) end

local function cb(<?self?>) end
Parent:work(cb)
]]

TEST 'Child' [[
---@class Parent
local Parent

---@generic T
---@param self T
---@param callback fun(self: T)
function Parent:work(callback) end

---@class Child: Parent
local Child

local function cb(<?self?>) end
Child:work(cb)
]]

config.set(nil, "Lua.type.inferParamType", false)

TEST 'string' [[
---@generic T
---@param x T
---@return { x: T }
local function f(x) end

local t = f('')

print(t.<?x?>)
]]

TEST 'string' [[
---@generic T
---@param t T[]
---@param callback fun(v: T)
local function f(t, callback) end

---@type string[]
local t

f(t, function (<?v?>) end)
]]

TEST 'unknown' [[
---@generic T
---@param t T[]
---@param callback fun(v: T)
local function f(t, callback) end

local t = {}

f(t, function (<?v?>) end)
]]

TEST 'table' [[
local <?t?> = setmetatable({}, { __index = function () end })
]]

TEST 'player' [[
---@class player
local t

<?t?>:getOwner()
]]

TEST 'string[][]' [[
---@type string[][]
local <?t?>
]]

TEST 'table' [[
---@type {}[]
local t

local <?v?> = t[1]
]]

TEST 'string' [[
---@type string[][]
local v = {}

for _, a in ipairs(v) do
    for i, <?b?> in ipairs(a) do
    end
end
]]

--TEST 'number' [[
-----@param x number
--local f
--
--f = function (<?x?>) end
--]]

TEST 'fun(i: integer)' [[
--- @class Emit
--- @field on fun(eventName: string, cb: function)
--- @field on fun(eventName: 'died', cb: fun(i: integer))
--- @field on fun(eventName: 'won', cb: fun(s: string))
local emit = {}

emit.on("died", <?function?> (i)
end)
]]

TEST 'integer' [[
--- @class Emit
--- @field on fun(eventName: string, cb: function)
--- @field on fun(eventName: 'died', cb: fun(i: integer))
--- @field on fun(eventName: 'won', cb: fun(s: string))
local emit = {}

emit.on("died", function (<?i?>)
end)
]]

TEST 'integer' [[
--- @class Emit
--- @field on fun(self: Emit, eventName: string, cb: function)
--- @field on fun(self: Emit, eventName: 'died', cb: fun(i: integer))
--- @field on fun(self: Emit, eventName: 'won', cb: fun(s: string))
local emit = {}

emit:on("died", function (<?i?>)
end)
]]

TEST 'integer' [[
--- @class Emit
--- @field on fun(self: Emit, eventName: string, cb: function)
--- @field on fun(self: Emit, eventName: '"died"', cb: fun(i: integer))
--- @field on fun(self: Emit, eventName: '"won"', cb: fun(s: string))
local emit = {}

emit.on(self, "died", function (<?i?>)
end)
]]

TEST '👍' [[
---@class 👍
local <?x?>
]]

TEST 'integer' [[
---@type boolean
local x

<?x?> = 1
]]

TEST 'integer' [[
---@class Class
local x

<?x?> = 1
]]

TEST 'unknown' [[
---@return number
local function f(x)
    local <?y?> = x()
end
]]

TEST 'unknown' [[
local mt

---@return number
function mt:f() end

local <?v?> = mt()
]]

TEST 'unknown' [[
local <?mt?>

---@class X
function mt:f(x) end
]]

TEST 'any' [[
local mt

---@class X
function mt:f(<?x?>) end
]]

TEST 'unknown' [[
local <?mt?>

---@type number
function mt:f(x) end
]]

TEST 'any' [[
local mt

---@type number
function mt:f(<?x?>) end
]]

TEST 'Test' [[
---@class Test
_G.<?Test?> = {}
]]

TEST 'integer' [[
rawset(_G, 'Test', 1)
print(<?Test?>)
]]

TEST 'string' [[
rawset(_G, 'Test', '')
print(<?Test?>)
]]

TEST 'boolean' [[
rawset(_G, 'Test', true)
print(<?Test?>)
]]

TEST 'table' [[
rawset(_G, 'Test', {})
print(<?Test?>)
]]

TEST 'Test' [[
---@class Test
rawset(_G, 'Test', {})
print(<?Test?>)
]]

TEST 'integer' [[
local mt = {}

---@param callback fun(i: integer)
function mt:loop(callback) end

mt:loop(function (<?i?>)
    
end)
]]

TEST 'C' [[
---@class D
---@field y integer # D comment

---@class C
---@field x integer # C comment
---@field d D

---@param c C
local function f(c) end

f <?{?>
    x = ,
}
]]

TEST 'integer' [[
---@class D
---@field y integer # D comment

---@class C
---@field x integer # C comment
---@field d D

---@param c C
local function f(c) end

f {
    <?x?> = ,
}
]]

TEST 'integer' [[
---@class D
---@field y integer # D comment

---@class C
---@field x integer # C comment
---@field d D

---@param c C
local function f(c) end

f {
    d = {
        <?y?> = ,
    }
}
]]

TEST 'integer' [[
for <?i?> = a, b, c do end
]]

TEST 'number' [[
---@param x number
function F(<?x?>) end

---@param x boolean
function F(x) end
]]

TEST 'B' [[
---@class A
local A

---@return A
function A:x() end

---@class B: A
local B

---@return B
function B:x() end

---@type B
local t

local <?v?> = t.x()
]]

TEST 'function' [[
---@overload fun()
function <?f?>() end
]]

TEST 'integer' [[
---@type table<string, integer>
local t

t.<?a?>
]]

TEST '"a"|"b"|"c"' [[
---@type table<string, "a"|"b"|"c">
local t

t.<?a?>
]]

TEST 'integer' [[
---@class A
---@field x integer

---@type A
local t
t.<?x?>
]]

TEST 'boolean' [[
local <?var?> = true
var = 1
var = 1.0
]]

TEST 'unknown' [[
---@return ...
local function f() end

local <?x?> = f()
]]

TEST 'unknown' [[
---@return ...
local function f() end

local _, <?x?> = f()
]]

TEST 'unknown' [[
local t = {
    x = 1,
    y = 2,
}

local <?x?> = t[#t]
]]

TEST 'string' [[
local t = {
    x   = 1,
    [1] = 'x',
}

local <?x?> = t[#t]
]]

TEST 'string' [[
local t = { 'x' }

local <?x?> = t[#t]
]]

TEST '(string|integer)[]' [[
---@type (string|integer)[]
local <?x?>
]]

TEST 'boolean' [[
---@type table<string, boolean>
local t

---@alias uri string

---@type string
local uri

local <?v?> = t[uri]
]]

TEST 'A' [[
---@class A
G = {}

<?G?>:A()
]]

TEST 'A' [[
---@type A
local <?x?> = nil
]]

TEST 'A' [[
---@class A
---@field b B
local mt

function mt:f()
    self.b:x()
    print(<?self?>)
end
]]

TEST 'string?' [[
---@return string?
local function f() end

local <?x?> = f()
]]

TEST 'AA' [[
---@class AA
---@overload fun():AA
local AAA


local <?x?> = AAA()
]]

TEST 'AA' [[
---@class AA
---@overload fun():AA
AAA = {}


local <?x?> = AAA()
]]

TEST 'string' [[
local <?x?>
x = '1'
x = 1
]]

TEST 'string' [[
local x
<?x?> = '1'
x = 1
]]

TEST 'integer' [[
local x
x = '1'
<?x?> = 1
]]

TEST 'unknown' [[
local x
print(<?x?>)
x = '1'
x = 1
]]

TEST 'string' [[
local x
x = '1'
print(<?x?>)
x = 1
]]

TEST 'integer' [[
local x
x = '1'
x = 1
print(<?x?>)
]]

TEST 'unknown' [[
local x

function A()
    print(<?x?>)
end
]]

TEST 'string' [[
local x

function A()
    print(<?x?>)
end

x = '1'
x = 1
]]

TEST 'string' [[
local x

x = '1'

function A()
    print(<?x?>)
end

x = 1
]]

TEST 'integer' [[
local x

x = '1'
x = 1

function A()
    print(<?x?>)
end

]]

TEST 'boolean' [[
local x

function A()
    x = true
    print(<?x?>)
end

x = '1'
x = 1
]]

TEST 'unknown' [[
local x

function A()
    x = true
end

print(<?x?>)
x = '1'
x = 1
]]

TEST 'boolean' [[
local x

function A()
    x = true
    function B()
        print(<?x?>)
    end
end

x = '1'
x = 1
]]

TEST 'table' [[
local x

function A()
    x = true
    function B()
        x = {}
        print(<?x?>)
    end
end

x = '1'
x = 1
]]

TEST 'boolean' [[
local x

function A()
    x = true
    function B()
        x = {}
    end
    print(<?x?>)
end

x = '1'
x = 1
]]

TEST 'unknown' [[
local x

function A()
    x = true
    function B()
        x = {}
    end
end

function C()
    print(<?x?>)
end

x = '1'
x = 1
]]

TEST 'integer' [[
local x
x = true
do
    x = 1
end
print(<?x?>)
]]

TEST 'boolean' [[
local x
x = true
function XX()
    do
        x = 1
    end
end
print(<?x?>)
]]

TEST 'integer?' [[
---@type integer?
local <?x?>
]]

TEST 'integer?' [[
---@type integer?
local x

if <?x?> then
    print(x)
end
]]
--[[
context 0 integer?

save copy 'block'
save copy 'out'
push 'block'
get
push copy
truthy
falsy ref 'out'
get
save HEAD 'final'
push 'out'

push copy HEAD
merge 'final'
]]

TEST 'integer' [[
---@type integer?
local x

if x then
    print(<?x?>)
end
]]

TEST 'integer?' [[
---@type integer?
local x

if x then
    print(x)
end

print(<?x?>)
]]

TEST 'nil' [[
---@type integer?
local x

if not x then
    print(<?x?>)
end

print(x)
]]

TEST 'integer' [[
---@type integer?
local x

if not x then
    x = 1
end

print(<?x?>)
]]

TEST 'integer' [[
---@type integer?
local x

if not x then
    return
end

print(<?x?>)
]]

TEST 'integer' [[
---@type integer?
local x

if xxx and x then
    print(<?x?>)
end
]]

TEST 'unknown' [[
---@type integer?
local x

if not x and x then
    print(<?x?>)
end
]]

TEST 'integer' [[
---@type integer?
local x

if x and not mark[x] then
    print(<?x?>)
end
]]

TEST 'integer?' [[
---@type integer?
local x

if xxx and x then
end

print(<?x?>)
]]

TEST 'integer?' [[
---@type integer?
local x

if xxx and x then
    return
end

print(<?x?>)
]]

TEST 'integer' [[
---@type integer?
local x

if x ~= nil then
    print(<?x?>)
end

print(x)
]]

TEST 'integer|nil' [[
---@type integer?
local x

if x ~= nil then
    print(x)
end

print(<?x?>)
]]

TEST 'nil' [[
---@type integer?
local x

if x == nil then
    print(<?x?>)
end

print(x)
]]

TEST 'integer|nil' [[
---@type integer?
local x

if x == nil then
    print(x)
end

print(<?x?>)
]]

TEST 'integer' [[
---@type integer?
local x

<?x?> = x or 1
]]

TEST 'integer' [[
---@type integer?
local x

<?x?> = x or y
]]

TEST 'integer' [[
---@type integer?
local x

if not x then
    return
end

print(<?x?>)
]]

TEST 'integer' [[
---@type integer?
local x

if not x then
    goto ANYWHERE
end

print(<?x?>)
]]

TEST 'integer' [=[
local x

print(<?x?>--[[@as integer]])
]=]

TEST 'integer' [=[
print(<?io?>--[[@as integer]])
]=]

TEST 'integer' [=[
print(io.<?open?>--[[@as integer]])
]=]

TEST 'integer' [=[
local <?x?> = io['open']--[[@as integer]])
]=]

TEST 'integer' [=[
local <?x?> = 1 + 1--[[@as integer]])
]=]

TEST 'integer' [=[
local <?x?> = not 1--[[@as integer]])
]=]

TEST 'integer' [=[
local <?x?> = ()--[[@as integer]])
]=]

TEST 'integer?' [[
---@param x? integer
local function f(<?x?>)

end
]]

TEST 'integer' [[
local x = 1
x = <?x?>
]]

TEST 'integer?' [[
---@class A
---@field x? integer
local t

t.<?x?>
]]

TEST 'integer?' [[
---@type { x?: integer }
local t

t.<?x?>
]]

TEST 'boolean' [[
---@class A
---@field [integer] boolean
local t

local <?x?> = t[1]
]]

TEST 'unknown' [[
local <?x?> = y and z
]]

TEST 'integer' [[
---@type integer?
local x

assert(x)

print(<?x?>)
]]

TEST 'integer' [[
---@type integer?
local x

assert(x ~= nil)

print(<?x?>)
]]

TEST 'integer' [[
---@type integer | nil
local x

assert(x)

print(<?x?>)
]]

TEST 'integer' [[
---@type integer | nil
local x

assert(x ~= nil)

print(<?x?>)
]]

TEST 'integer' [[
local x

assert(x == 1)

print(<?x?>)
]]

TEST 'integer' [[
---@type integer?
local x

if x and <?x?>.y then
end
]]

TEST 'integer?' [[
---@type integer?
local x

if x and x.y then
end

print(<?x?>)
]]

TEST 'integer?' [[
---@type integer?
local x

if x and x.y then
    return
end

print(<?x?>)
]]

TEST 'integer' [[
---@type integer?
local x

if not x or <?x?>.y then
end
]]

TEST 'integer?' [[
---@type integer?
local x

if not x or x.y then
    print(<?x?>)
end
]]

TEST 'integer?' [[
---@type integer?
local x

if x or x.y then
    print(<?x?>)
end
]]

TEST 'integer?' [[
---@type integer?
local x

if x.y or x then
    print(<?x?>)
end
]]

TEST 'integer?' [[
---@type integer?
local x

if x.y or not x then
    print(<?x?>)
end
]]

TEST 'integer' [[
---@type integer?
local x

if not x or not y then
    return
end

print(<?x?>)
]]

TEST 'integer' [[
---@type integer?
local x

if not y or not x then
    return
end

print(<?x?>)
]]

TEST 'integer' [[
---@type integer?
local x

while true do
    if not x then
        break
    end
    print(<?x?>)
end
]]

TEST 'integer?' [[
---@type integer?
local x

while true do
    if not x then
        break
    end
end

print(<?x?>)
]]

TEST 'integer' [[
---@type integer?
local x

while x do
    print(<?x?>)
end
]]

TEST 'integer' [[
---@type fun():integer?
local iter

for <?x?> in iter do
end
]]

TEST 'integer' [[
local x

---@type integer
<?x?> = XXX
]]

TEST 'unknown' [[
for _ = 1, 999 do
    local <?x?>
end
]]

TEST 'integer' [[
local x

---@cast x integer

print(<?x?>)
]]

TEST 'unknown' [[
local x

---@cast x integer

local x
print(<?x?>)
]]

TEST 'unknown' [[
local x

if true then
    local x
    ---@cast x integer
    print(x)
end

print(<?x?>)
]]

TEST 'boolean|integer' [[
local x = 1

---@cast x +boolean

print(<?x?>)
]]

TEST 'boolean' [[
---@type integer|boolean
local x

---@cast x -integer

print(<?x?>)
]]

TEST 'boolean?' [[
---@type boolean
local x

---@cast x +?

print(<?x?>)
]]

TEST 'boolean' [[
---@type boolean?
local x

---@cast x -?

print(<?x?>)
]]

TEST 'nil' [[
---@type string?
local x

if x then
    return
else
    print(<?x?>)
end

print(x)
]]

TEST 'string' [[
---@type string?
local x

if not x then
    return
else
    print(<?x?>)
end

print(x)
]]

TEST 'string' [[
---@type string?
local x

if not x then
    return
else
    print(x)
end

print(<?x?>)
]]

TEST 'true' [[
---@type boolean | nil
local x

if not x then
    return
end

print(<?x?>)
]]

TEST 'true' [[
---@type boolean
local t

if t then
    print(<?t?>)
    return
end

print(t)
]]

TEST 'false' [[
---@type boolean
local t

if t then
    print(t)
    return
end

print(<?t?>)
]]

TEST 'nil' [[
---@type integer?
local t

if t then
else
    print(<?t?>)
end

print(t)
]]

TEST 'table' [[
local function f()
    if x then
        return y
    end
    return {}
end

local <?z?> = f()
]]

TEST 'integer|table' [[
local function returnI()
    return 1
end

local function f()
    if x then
        return returnI()
    end
    return {}
end

local <?z?> = f()
]]

TEST 'number' [[
for _ in _ do
    ---@type number
    local <?x?>
end
]]

TEST 'unknown' [[
for _ in _ do
    ---@param x number
    local <?x?>
end
]]

TEST 'unknown' [[
---@type number
for <?x?> in _ do
end
]]

TEST 'number' [[
---@param x number
for <?x?> in _ do
end
]]

TEST 'table' [[
---@alias tp table

---@type tp
local <?x?>
]]

TEST '{ name: boolean }' [[
---@alias tp {name: boolean}

---@type tp
local <?x?>
]]

TEST 'boolean|{ name: boolean }' [[
---@alias tp boolean | {name: boolean}

---@type tp
local <?x?>
]]

TEST '`1`|`true`' [[
---@type `1` | `true`
local <?x?>
]]

TEST 'function' [[
local x

function x() end

print(<?x?>)
]]

TEST 'unknown' [[
local x

if x.field == 'haha' then
    print(<?x?>)
end
]]

TEST 'string' [[
---@type string?
local t

if not t or xxx then
    return
end

print(<?t?>)
]]

TEST 'table' [[
---@type table|nil
local t

return function ()
    if not t then
        return
    end
    
    print(<?t?>)
end
]]

TEST 'table' [[
---@type table|nil
local t

f(function ()
    if not t then
        return
    end
    
    print(<?t?>)
end)
]]

TEST 'table' [[
---@type table?
local t

t = t or {}

print(<?t?>)
]]

TEST 'unknown|nil' [[
local x

if x == nil then
end

print(<?x?>)
]]

TEST 'table<xxx, true>' [[
---@alias xxx table<xxx, true>

---@type xxx
local <?t?>
]]

TEST 'xxx[][]' [[
---@alias xxx xxx[]

---@type xxx
local <?t?>
]]

TEST 'fun(x: fun(x: xxx))' [[
---@alias xxx fun(x: xxx)

---@type xxx
local <?t?>
]]

TEST 'table' [[
---@type table|nil
local t

while t do
    print(<?t?>)
end
]]

TEST 'table|nil' [[
---@type table|nil
local t

while <?t?> do
    print(t)
end
]]

TEST 'table' [[
---@type table|nil
local t

while t ~= nil do
    print(<?t?>)
end
]]

TEST 'table|nil' [[
---@type table|nil
local t

while <?t?> ~= nil do
    print(t)
end
]]

TEST 'integer' [[
---@type integer?
local n

if not n then
    error('n is nil')
end

print(<?n?>)
]]

TEST 'integer' [[
---@type integer?
local n

if not n then
    os.exit()
end

print(<?n?>)
]]

TEST 'table' [[
---@type table?
local n

print((n and <?n?>.x))
]]

TEST 'table' [[
---@type table?
local n

n = n and <?n?>.x or 1
]]

TEST 'table' [[
---@type table?
local n

n = ff[n and <?n?>.x]
]]

TEST 'integer' [[
local x

if type(x) == 'integer' then
    print(<?x?>)
end
]]

TEST 'boolean|integer' [[
local x

if type(x) == 'integer'
or type(x) == 'boolean' then
    print(<?x?>)
end
]]

TEST 'fun()' [[
---@type fun()?
local x

if type(x) == 'function' then
    print(<?x?>)
end
]]

TEST 'function' [[
local x

if type(x) == 'function' then
    print(<?x?>)
end
]]

TEST 'integer' [[
local x
local tp = type(x)

if tp == 'integer' then
    print(<?x?>)
end
]]

TEST 'integer' [[
---@type integer?
local x

if (x == nil) then
else
    print(<?x?>)
end
]]

TEST 'B' [[
---@class A
---@class B

---@type A
local x

---@type B
x = call(x)

print(<?x?>)
]]

TEST 'nil' [[
local function f()
end

local <?x?> = f()
]]

TEST 'integer[]' [[
---@type integer[]
local x
if not x then
    return
end

print(<?x?>)
]]

TEST 'unknown' [[
---@type string[]
local t

local <?x?> = t.x
]]

TEST 'integer|unknown' [[
local function f()
    return GG
end

local t

t.x = 1
t.x = f()

print(t.<?x?>)
]]

TEST 'integer' [[
local function f()
    if X then
        return X
    else
        return 1
    end
end

local <?n?> = f()
]]

TEST 'unknown' [[
local function f()
    return t[k]
end

local <?n?> = f()
]]

TEST 'integer|nil' [[
local function f()
    if x then
        return
    else
        return 1
    end
end

local <?n?> = f()
]]

TEST 'integer' [[
---@class A
---@field x integer
local m

m.<?x?> = true

print(m.x)
]]

TEST 'integer' [[
---@class A
---@field x integer
local m

m.x = true

print(m.<?x?>)
]]

TEST 'integer' [[
---@class A
---@field x integer --> 1st
local m = {
    x = '' --> 2nd
}

---@type boolean
m.x = true --> 3rd (with ---@type above)

m.x = {} --> 4th

print(m.<?x?>)
]]

TEST 'string' [[
---@class A
----@field x integer --> 1st
local m = {
    x = '' --> 2nd
}

---@type boolean
m.x = true --> 3rd (with ---@type above)

m.x = {} --> 4th

print(m.<?x?>)
]]

TEST 'boolean' [[
---@class A
----@field x integer --> 1st
local m = {
    --x = '' --> 2nd
}

---@type boolean
m.x = true --> 3rd (with ---@type above)

m.x = {} --> 4th

print(m.<?x?>)
]]

TEST 'table' [[
---@class A
----@field x integer --> 1st
local m = {
    --x = '' --> 2nd
}

---@type boolean
--m.x = true --> 3rd (with ---@type above)

m.x = {} --> 4th

print(m.<?x?>)
]]

TEST 'boolean?' [[
---@generic T
---@param x T
---@return T
local function echo(x) end

---@type boolean?
local b

local <?x?> = echo(b)
]]

TEST 'boolean' [[
---@generic T
---@param x T?
---@return T
local function echo(x) end

---@type boolean?
local b

local <?x?> = echo(b)
]]

TEST 'boolean' [[
---@generic T
---@param x? T
---@return T
local function echo(x) end

---@type boolean?
local b

local <?x?> = echo(b)
]]

TEST 'boolean' [[
---@type {[integer]: boolean, xx: integer}
local t

local <?n?> = t[1]
]]

TEST 'boolean' [[
---@type integer
local i

---@type {[integer]: boolean, xx: integer}
local t

local <?n?> = t[i]
]]

TEST 'string' [=[
local x = true
local y = x--[[@as integer]] --is `integer` here
local z = <?x?>--[[@as string]] --is `true` here
]=]

TEST 'integer' [[
---@type integer
local x

if type(x) == 'number' then
    print(<?x?>)
end
]]

TEST 'boolean' [[
---@class A
---@field [integer] boolean
local mt

function mt:f()
    ---@type integer
    local index
    local <?x?> = self[index]
end
]]

TEST 'boolean' [[
---@class A
---@field [B] boolean

---@class B

---@type A
local a

---@type B
local b

local <?x?> = a[b]
]]

TEST 'number' [[
---@type {x: string ; y: boolean; z: number}
local t

local <?z?> = t.z
]]

TEST 'fun():number, boolean' [[
---@type {f: fun():number, boolean}
local t

local <?f?> = t.f
]]

TEST 'fun():number' [[
---@type {(f: fun():number), x: boolean}
local t

local <?f?> = t.f
]]

TEST 'boolean' [[
---@param ... boolean
local function f(...)
    local <?n?> = ...
end
]]

TEST 'boolean' [[
---@param ... boolean
local function f(...)
    local _, <?n?> = ...
end
]]

TEST 'boolean' [[
---@return boolean ...
local function f() end

local <?n?> = f()
]]

TEST 'boolean' [[
---@return boolean ...
local function f() end

local _, <?n?> = f()
]]

TEST 'boolean' [[
---@type fun():name1: boolean, name2:number
local f

local <?n?> = f()
]]

TEST 'number' [[
---@type fun():name1: boolean, name2:number
local f

local _, <?n?> = f()
]]
TEST 'boolean' [[
---@type fun():(name1: boolean, name2:number)
local f

local <?n?> = f()
]]

TEST 'number' [[
---@type fun():(name1: boolean, name2:number)
local f

local _, <?n?> = f()
]]

TEST 'boolean' [[
---@type fun():...: boolean
local f

local _, <?n?> = f()
]]

TEST 'string' [[
local s
while true do
    s = ''
end
print(<?s?>)
]]

TEST 'string' [[
local s
for _ in _ do
    s = ''
end
print(<?s?>)
]]

TEST 'A' [[
---@class A: string

---@type A
local <?s?> = ''
]]

TEST 'number' [[
---@return number
local function f() end
local x, <?y?> = 1, f()
]]

TEST 'boolean' [[
---@return number, boolean
local function f() end
local x, y, <?z?> = 1, f()
]]

TEST 'number' [[
---@return number, boolean
local function f() end
local x, y, <?z?> = 1, 2, f()
]]

TEST 'unknown' [[
local f

print(<?f?>)

function f() end
]]

TEST 'unknown' [[
local f

do
    print(<?f?>)
end

function f() end
]]

TEST 'function' [[
local f

function A()
    print(<?f?>)
end

function f() end
]]

TEST 'number' [[
---@type number|nil
local n

local t = {
    x = n and <?n?>,
}
]]

TEST 'table' [[
---@type table?
local n

if not n or not <?n?>.x then
end
]]

TEST 'table' [[
---@type table?
local n

if not n or not <?n?>[1] then
end
]]

TEST 'number' [[
---@type number|false
local n

---@cast n -false

print(<?n?>)
]]

TEST 'table' [[
---@type number|table
local n

if  n
---@cast n table
and <?n?>.type == 'xxx' then
end
]]

TEST 'integer' [[
---@type integer?
local n
if true then
    n = 0
end
local <?x?> = n or 0
]]

TEST 'number' [=[
local <?x?> = F()--[[@as number]]
]=]

TEST 'number' [=[
local function f()
    return F()--[[@as number]]
end

local <?x?> = f()
]=]

TEST 'number' [=[
local <?x?> = X --[[@as number]]
]=]

TEST 'number' [[
---@return number?, number?
local function f() end

for <?x?>, y in f do
end
]]

TEST 'number' [[
---@return number?, number?
local function f() end

for x, <?y?> in f do
end
]]

TEST 'number|nil' [[
---@type table|nil
local a

---@type number|nil
local b

local <?c?> = a and b
]]

TEST 'number|table|nil' [[
---@type table|nil
local a

---@type number|nil
local b

local <?c?> = a or b
]]

TEST 'number|table|nil' [[
---@type table|nil
local a

---@type number|nil
local b

local c = a and b
local <?d?> = a or b
]]

TEST 'number' [[
local x

---@return number
local function f()
end

x = f()

print(<?x?>)
]]

TEST 'number' [[
local x

---@return number
local function f()
end

_, x = pcall(f)

print(<?x?>)
]]

TEST 'string' [[
---@type table<string|number, string>
local t

---@type number
local n
---@type string
local s

local <?test?>  = t[n] 
local test2 = t[s] --test and test2 are unknow
]]

TEST 'string' [[
---@type table<string|number, string>
local t

---@type number
local n
---@type string
local s

local test  = t[n] 
local <?test2?> = t[s] --test and test2 are unknow
]]

TEST 'table<number, boolean>' [[
---@type table<number, boolean>
local t

<?t?> = {}
]]

TEST 'integer' [[
---@type integer[]|A
local t

local <?x?> = t[1]
]]

TEST 'integer' [[
---@type integer
---@diagnostic disable
local <?t?>
]]

TEST 'A' [[
---@class A
---@diagnostic disable
local <?t?>
]]

TEST '{ [string]: number, [true]: string, [1]: boolean, tag: integer }' [[
---@type {[string]: number, [true]: string, [1]: boolean, tag: integer}
local <?t?>
]]

TEST 'unknown' [[
local mt = {}
mt.<?x?> = nil
]]

TEST 'unknown' [[
mt = {}
mt.<?x?> = nil
]]

TEST 'A' [[
---@class A
---@operator unm: A

---@type A
local a
local <?b?> = -a
]]

TEST 'A' [[
---@class A
---@operator bnot: A

---@type A
local a
local <?b?> = ~a
]]

TEST 'A' [[
---@class A
---@operator len: A

---@type A
local a
local <?b?> = #a
]]

TEST 'A' [[
---@class A
---@operator add: A

---@type A
local a
local <?b?> = a + 1
]]

TEST 'A' [[
---@class A
---@operator sub: A

---@type A
local a
local <?b?> = a - 1
]]

TEST 'A' [[
---@class A
---@operator mul: A

---@type A
local a
local <?b?> = a * 1
]]

TEST 'A' [[
---@class A
---@operator div: A

---@type A
local a
local <?b?> = a / 1
]]

TEST 'A' [[
---@class A
---@operator mod: A

---@type A
local a
local <?b?> = a % 1
]]

TEST 'A' [[
---@class A
---@operator pow: A

---@type A
local a
local <?b?> = a ^ 1
]]

TEST 'A' [[
---@class A
---@operator idiv: A

---@type A
local a
local <?b?> = a // 1
]]

TEST 'A' [[
---@class A
---@operator band: A

---@type A
local a
local <?b?> = a & 1
]]

TEST 'A' [[
---@class A
---@operator bor: A

---@type A
local a
local <?b?> = a | 1
]]

TEST 'A' [[
---@class A
---@operator bxor: A

---@type A
local a
local <?b?> = a ~ 1
]]

TEST 'A' [[
---@class A
---@operator shl: A

---@type A
local a
local <?b?> = a << 1
]]

TEST 'A' [[
---@class A
---@operator shr: A

---@type A
local a
local <?b?> = a >> 1
]]

TEST 'A' [[
---@class A
---@operator concat: A

---@type A
local a
local <?b?> = a .. 1
]]

TEST 'A' [[
---@class A
---@operator add(boolean): boolean
---@operator add(integer): A

---@type A
local a
local <?b?> = a + 1
]]

TEST 'boolean' [[
---@class A
---@operator add(boolean): boolean
---@operator add(integer): A

---@type A
local a
local <?b?> = a + true
]]

TEST 'A' [[
---@class A
---@operator call: A

---@type A
local a
local <?b?> = a()
]]

TEST 'A' [[
---@class A
---@operator call: A

---@type A
local a

local t = {
    <?x?> = a(),
}
]]

TEST 'boolean' [[
---@class A
---@field n number
---@field [string] boolean
local t

local <?x?> = t.xx
]]

TEST 'number' [[
---@class A
---@field n number
---@field [string] boolean
local t

local <?x?> = t.n
]]

TEST 'function' [[
---@class A
---@field [string] boolean
local t
function t.f() end

local <?f?> = t.f
]]

TEST 'function' [[
---@class A
---@field [string] boolean
local t = {
    f = function () end
}

local <?f?> = t.f
]]

TEST 'string' [[
---@class string
---@operator mod: string

local <?b?> = '' % 1
]]

TEST 'string|integer' [[
---@type boolean
local bool

local <?x?> = bool and '' or 0
]]

TEST 'string|integer' [[
local bool

if X then
    bool = true
else
    bool = false
end

local <?x?> = bool and '' or 0
]]

TEST 'boolean' [[
---@type boolean|true|false
local <?b?>
]]

TEST 'integer|false' [[
local <?b?> = X == 1 and X == 1 and 1
]]

TEST 'unknown|nil' [[
local function f()
    if X then
        return ({})[1]
    end
    return nil
end

local <?n?> = f()
]]

TEST 'integer' [[
---@generic T
---@vararg T # ERROR
---@return T
local function test(...)
    return ...
end

local <?n?> = test(1)
]]

TEST 'boolean' [[
---@type boolean, number
local <?x?>, y
]]

TEST 'number' [[
---@type boolean, number
local x, <?y?>
]]

TEST 'unknown' [[
---@type _, number
local <?x?>, y
]]

TEST 'number[]' [[
local t
---@cast t number[]?

local x = t and <?t?>[i]
]]

TEST 'number?' [[
---@type number[]?
local t

local <?x?> = t and t[i]
]]

TEST 'number' [[
---@type number
local x

if not <?x?>.y then
    x = nil
end
]]

TEST 'number' [[
---@type number|nil
local x
while x == nil do
    if x == nil then
        return
    end

    x = nil
end

print(<?x?>)
]]

TEST 'integer' [[
local A = {
    ---@class XXX
    B = {}
}

A.B.C = 1

print(A.B.<?C?>)
]]

TEST '-2|-3|1' [[
---@type 1|-2|-3
local <?n?>
]]

TEST 'enum A' [[
---@enum A
local m = {}

print(<?m?>)
]]

TEST 'A' [[
---@class A
---@overload fun():A
local m = {}

---@return A
function m:init()
    return <?self?>
end
]]

TEST 'string' [[
---@vararg string
function F(...)
    local t = {...}
    for k, <?v?> in pairs(t) do
    end
end
]]

TEST 'string' [[
---@vararg string
function F(...)
    local t = {...}
    for k, <?v?> in ipairs(t) do
    end
end
]]

TEST 'integerA' [[
---@type integerA
for <?i?> = 1, 10 do
end
]]

TEST 'string' [[
---@class A
---@field x string

---@class B : A
local t = {}

t.x = t.x

print(t.<?x?>)
]]

TEST 'unknown' [[
local t = {
    x = 1,
}

local x

local <?v?> = t[x]
]]

TEST 'A|B' [[
---@class A
---@class B: A

---@type A|B
local <?t?>
]]

TEST 'function' [[
---@class myClass
local myClass = { has = { nested = {} } }

function myClass.has.nested.fn() end

---@type myClass
local class

class.has.nested.<?fn?>()
]]

TEST 'integer[]' [[
---@generic T
---@param f fun(x: T)
---@return T[]
local function x(f) end

---@param x integer
local <?arr?> = x(function (x) end)
]]

TEST 'integer[]' [[
---@generic T
---@param f fun():T
---@return T[]
local function x(f) end

local <?arr?> = x(function ()
    return 1
end)
]]

TEST 'integer[]' [[
---@generic T
---@param f fun():T
---@return T[]
local function x(f) end

---@return integer
local <?arr?> = x(function () end)
]]

TEST 'integer[]' [[
---@generic T
---@param f fun(x: T)
---@return T[]
local function x(f) end

---@type fun(x: integer)
local cb

local <?arr?> = x(cb)
]]

TEST 'integer[]' [[
---@generic T
---@param f fun():T
---@return T[]
local function x(f) end

---@type fun(): integer
local cb

local <?arr?> = x(cb)
]]

TEST 'integer' [[
---@return fun(x: integer)
local function f()
    return function (<?x?>)
    end
end
]]

TEST 'string' [[
---@class A
---@field f fun(x: string)

---@type A
local t = {
    f = function (<?x?>) end
}
]]

config.set(nil, 'Lua.runtime.special', {
    ['xx.assert'] = 'assert'
})

TEST 'number' [[
---@type number?
local t

xx.assert(t)

print(<?t?>)
]]

config.set(nil, 'Lua.runtime.special', nil)

TEST 'A' [[
---@class A
local mt

---@return <?self?>
function mt:init()
end
]]

TEST 'A' [[
---@class A
local mt

---@return self
function mt:init()
end

local <?o?> = mt:init()
]]

TEST 'A' [[
---@class A
---@field x <?self?>
]]

TEST 'A' [[
---@class A
---@field x self

---@type A
local o

print(o.<?x?>)
]]

TEST 'A' [[
---@class A
---@overload fun(): self
local A

local <?o?> = A()
]]

TEST 'number' [[
---@type table<'Test1', fun(x: number)>
local t = {
    ["Test1"] = function(<?x?>) end,
}
]]

TEST 'number' [[
---@type table<5, fun(x: number)>
local t = {
    [5] = function(<?x?>) end,
}
]]

TEST 'number' [[
---@type fun(x: number)
local function f(<?x?>) end
]]

TEST 'number' [[
---@type fun(x:number)[]
local t = {
    function (<?x?>) end,
}
]]

TEST 'number' [[
---@type fun(x:number)[]
local t = {
    [1] = function (<?x?>) end,
}
]]

TEST 'number' [[
---@type {[integer]: fun(x:number)}
local t = {
    function (<?x?>) end,
}
]]

TEST 'number' [[
---@type {[integer]: fun(x:number)}
local t = {
    [1] = function (<?x?>) end,
}
]]

TEST 'boolean' [[
---@generic T: string | boolean | table
---@param x T
---@return T
local function f(x)
    return x
end

local <?x?> = f(true)
]]

TEST 'number' [[
---@class A
---@field [1] number
---@field [2] boolean
local t

local <?n?> = t[1]
]]

TEST 'boolean' [[
---@class A
---@field [1] number
---@field [2] boolean
local t

local <?n?> = t[2]
]]

TEST 'N' [[
---@class N: number
local x

if x == 0.1 then
    print(<?x?>)
end
]]

TEST 'vec3' [[
---@class mat4
---@operator mul(vec3): vec3 -- matrix * vector
---@operator mul(number): mat4 -- matrix * constant

---@class vec3: number

---@type mat4, vec3
local m, v

local <?r?> = m * v
]]

TEST 'mat4' [[
---@class mat4
---@operator mul(number): mat4 -- matrix * constant
---@operator mul(vec3): vec3 -- matrix * vector

---@class vec3: number

---@type mat4, vec3
local m, v

local <?r?> = m * v
]]

TEST 'A|B' [[
---@class A
---@class B

---@type A|B
local t

if x then
    ---@cast t A
else
    print(<?t?>)
end
]]

TEST 'A|B' [[
---@class A
---@class B

---@type A|B
local t

if x then
    ---@cast t A
elseif <?t?> then
end
]]

TEST 'A|B' [[
---@class A
---@class B

---@type A|B
local t

if x then
    ---@cast t A
    print(t)
elseif <?t?> then
end
]]

TEST 'A|B' [[
---@class A
---@class B

---@type A|B
local t

if x then
    ---@cast t A
    print(t)
elseif <?t?> then
    ---@cast t A
    print(t)
end
]]

TEST 'function' [[
local function x()
    print(<?x?>)
end
]]

TEST 'number' [[
---@type number?
local x

do
    if not x then
        return
    end
end

print(<?x?>)
]]

TEST 'number' [[
---@type number[]
local xs

---@type fun(x): number?
local f

for _, <?x?> in ipairs(xs) do
    x = f(x)
end
]]

TEST 'number' [[
---@type number?
X = Y

if X then
    print(<?X?>)
end
]]

TEST 'number' [[
---@type number|boolean
X = Y

if type(X) == 'number' then
    print(<?X?>)
end
]]

TEST 'boolean' [[
---@type number|boolean
X = Y

if type(X) ~= 'number' then
    print(<?X?>)
end
]]

TEST 'boolean' [[
---@type number
X = Y

---@cast X boolean

print(<?X?>)
]]

TEST 'number' [[
---@type number
local t

if xxx == <?t?> then
    print(t)
end
]]

TEST 'V' [[
---@class V
X = 1

print(<?X?>)
]]

TEST 'V' [[
---@class V
X.Y = 1

print(X.<?Y?>)
]]

TEST 'integer' [[
local x = {}

x.y = 1
local y = x.y
x.y = nil

print(<?y?>)
]]

TEST 'function' [[
function X()
    <?Y?>()
end

function Y()
end
]]

TEST 'A_Class' [[
---@class A_Class
local A = { x = 5 }

function A:func()
    for i = 1, <?self?>.x do
        print(i)
    end

    self.y = 3
    self.y = self.y + 3
end
]]

TEST 'number' [[
---@type number?
local n
local <?v?> = n or error('')
]]

TEST 'Foo' [[
---@class Foo
---@operator mul(Foo): Foo
---@operator mul(Bar): Foo
---@class Bar

---@type Foo
local foo

---@type Foo|Bar
local fooOrBar

local <?b?> = foo * fooOrBar
]]

TEST 'number' [[
local a = 4;
local b = 2;

local <?c?> = a / b;
]]

TEST 'string' [[
local a = '4';
local b = '2';

local <?c?> = a .. b;
]]

TEST 'number|{ [1]: string }' [[
---@alias Some
---| { [1]: string }
---| number

local x ---@type Some

print(<?x?>)
]]

TEST 'integer' [[
---@class metatable : table
---@field __index table

---@param table      table
---@param metatable? metatable
---@return table
function setmetatable(table, metatable) end

local m = setmetatable({},{ __index = { a = 1 } })

m.<?a?>
]]

TEST 'integer' [[
---@class metatable : table
---@field __index table

---@param table      table
---@param metatable? metatable
---@return table
function setmetatable(table, metatable) end

local mt = {a = 1 }
local m = setmetatable({},{ __index = mt })

m.<?a?>
]]

TEST 'integer' [[
local x = 1
repeat
until <?x?>
]]

-- #2144
TEST 'A' [=[
local function f()
    return {} --[[@as A]]
end

local <?x?> = f()
]=]

TEST 'A' [=[
local function f()
    ---@type A
    return {}
end

local <?x?> = f()
]=]

TEST 'boolean|number' [[
---@alias A number
---@alias(partial) A boolean

---@type A
local <?x?>
]]

--reverse binary operator tests

TEST 'A' [[
---@class A
---@operator add(number): A

---@type A
local x
local <?y?> = x + 1
]]

TEST 'A' [[
---@class A
---@operator add(number): A

---@type A
local x
local <?y?> = 1 + x
]]

TEST 'A' [[
---@class A
---@operator sub(number): A

---@type A
local x
local <?y?> = x - 1
]]

TEST 'A' [[
---@class A
---@operator sub(number): A

---@type A
local x
local <?y?> = 1 - x
]]

TEST 'A' [[
---@class A
---@operator mul(number): A

---@type A
local x
local <?y?> = x * 1
]]

TEST 'A' [[
---@class A
---@operator mul(number): A

---@type A
local x
local <?y?> = 1 * x
]]

TEST 'A' [[
---@class A
---@operator div(number): A

---@type A
local x
local <?y?> = x / 1
]]

TEST 'A' [[
---@class A
---@operator div(number): A

---@type A
local x
local <?y?> = 1 / x
]]

TEST 'A' [[
---@class A
---@operator idiv(number): A

---@type A
local x
local <?y?> = x // 1
]]

TEST 'A' [[
---@class A
---@operator idiv(number): A

---@type A
local x
local <?y?> = 1 // x
]]

TEST 'A' [[
---@class A
---@operator mod(number): A

---@type A
local x
local <?y?> = x % 1
]]

TEST 'A' [[
---@class A
---@operator mod(number): A

---@type A
local x
local <?y?> = 1 % x
]]

TEST 'A' [[
---@class A
---@operator pow(number): A

---@type A
local x
local <?y?> = x ^ 1
]]

TEST 'A' [[
---@class A
---@operator pow(number): A

---@type A
local x
local <?y?> = 1 ^ x
]]

TEST 'A' [[
---@class A
---@operator concat(number): A

---@type A
local x
local <?y?> = x .. 1
]]

TEST 'A' [[
---@class A
---@operator concat(number): A

---@type A
local x
local <?y?> = 1 .. x
]]

TEST 'A' [[
---@class A
---@operator band(number): A

---@type A
local x
local <?y?> = x & 1
]]

TEST 'A' [[
---@class A
---@operator band(number): A

---@type A
local x
local <?y?> = 1 & x
]]

TEST 'A' [[
---@class A
---@operator bor(number): A

---@type A
local x
local <?y?> = x | 1
]]

TEST 'A' [[
---@class A
---@operator bor(number): A

---@type A
local x
local <?y?> = 1 | x
]]

TEST 'A' [[
---@class A
---@operator bxor(number): A

---@type A
local x
local <?y?> = x ~ 1
]]

TEST 'A' [[
---@class A
---@operator bxor(number): A

---@type A
local x
local <?y?> = 1 ~ x
]]

TEST 'A' [[
---@class A
---@operator shl(number): A

---@type A
local x
local <?y?> = x << 1
]]

TEST 'A' [[
---@class A
---@operator shl(number): A

---@type A
local x
local <?y?> = 1 << x
]]

TEST 'A' [[
---@class A
---@operator shr(number): A

---@type A
local x
local <?y?> = x >> 1
]]

TEST 'A' [[
---@class A
---@operator shr(number): A

---@type A
local x
local <?y?> = 1 >> x
]]

TEST 'number' [[
---@class A
local A = {}

---@param x number
function A:func(x) end

---@class B: A
local B = {}

function B:func(<?x?>) end
]]

TEST 'number' [[
---@class A
local A = {}

---@param x number
function A:func(x) end

---@type A
local a = {}
function a:func(<?x?>) end
]]

-- #3089
TEST 'fun(x: number, y: number)' [[
---@class Person
---@field age? number
---@field foo fun(x: number, y: number)

---@param person Person
local function test(person)
    if person.foo ~= nil then
        local <?b?> = person.foo
    end
end
]]

-- #2952
TEST 'A' [[
---@class A
---@field b {[C]:D}
local A

if A.b ~= {} then
    local C = <?A?>
end
]]

TEST 'A' [[
---@class A
---@field type 'a'
---@field field1 integer

---@class B
---@field type 'b'

local obj --- @type A|B

if obj.type == 'a' and obj.field1 > 0 then
    local <?r?> = obj
end
]]

TEST 'B' [[
---@class A
---@field type 'a'

---@class B
---@field type 'b'

local obj --- @type A|B

if obj.type == 'a' then
    ---
else
    local <?r?> = obj
end
]]

TEST 'A' [[
---@class A
---@field type 'a'

---@class B
---@field type 'b'

---@class C
---@field type 'c'

---@alias AB A|B

local obj --- @type C|AB

if obj.type == 'a' then
    local <?r?> = obj
end
]]

TEST 'A|B' [[
--- @class A
--- @field mode? 'a' | 'b'

--- @class B

local a --- @type A | B

if a.mode == 'a' then
    local b = a
else
    local <?b?> = a
end
]]

TEST 'A|B' [[
--- @class A
--- @field mode? 'a' | 'b'

--- @class B

local a --- @type A | B

if a.mode ~= 'a' then
    local <?b?> = a
end
]]

TEST 'A' [[
--- @class A
--- @field mode? 'a' | 'b'

--- @class B

local a --- @type A | B

if a.mode ~= 'a' then
else
    local <?b?> = a
end
]]

TEST 'nil' [[
---@generic T
---@param v T
---@return T
---@overload fun(): nil
local function f(v) end

local <?r?> = f()
]]

TEST 'string' [[
---@generic T
---@param v T
---@return T
---@overload fun(): nil
local function f(v) end

local <?r?> = f('')
]]

TEST 'A' [[
---@class A
local A = {}

---@generic T
---@param self T
---@param s string
---@return T
function A:f(s) end

---@generic T
---@param self T
---@param i integer
---@return T
function A:f(i) end

local <?r?> = A:f('')
]]

TEST 'B' [[
---@class A
local A = {}

---@generic T
---@param self T
---@param s string
---@return T
function A:f(s) end

---@generic T
---@param self T
---@param i integer
---@return T
function A:f(i) end

---@class B: A
local B = {}
local <?r?> = B:f('')
]]

TEST 'integer' [[
local function F(...)
    local t = {...}
    for <?k?> in pairs(t) do
    end
end
]]

TEST '1' [[
---@type [1, 2, 3]
local t

---@generic T1, T2, T3, T4, T5, T6, T7, T8, T9, T10
---@param arr {
--- [1]?: T1,
--- [2]?: T2,
--- [3]?: T3,
--- [4]?: T4,
--- [5]?: T5,
--- [6]?: T6,
--- [7]?: T7,
--- [8]?: T8,
--- [9]?: T9,
--- [10]?: T10,
---}
---@return T1, T2, T3, T4, T5, T6, T7, T8, T9, T10
local function unpack(arr)
end

local <?a?>, b, c, d = unpack(t)
]]

TEST '2' [[
---@type [1, 2, 3]
local t

---@generic T1, T2, T3, T4, T5, T6, T7, T8, T9, T10
---@param arr {
--- [1]?: T1,
--- [2]?: T2,
--- [3]?: T3,
--- [4]?: T4,
--- [5]?: T5,
--- [6]?: T6,
--- [7]?: T7,
--- [8]?: T8,
--- [9]?: T9,
--- [10]?: T10,
---}
---@return T1, T2, T3, T4, T5, T6, T7, T8, T9, T10
local function unpack(arr)
end

local a, <?b?>, c, d = unpack(t)
]]

TEST '3' [[
---@type [1, 2, 3]
local t

---@generic T1, T2, T3, T4, T5, T6, T7, T8, T9, T10
---@param arr {
--- [1]?: T1,
--- [2]?: T2,
--- [3]?: T3,
--- [4]?: T4,
--- [5]?: T5,
--- [6]?: T6,
--- [7]?: T7,
--- [8]?: T8,
--- [9]?: T9,
--- [10]?: T10,
---}
---@return T1, T2, T3, T4, T5, T6, T7, T8, T9, T10
local function unpack(arr)
end

local a, b, <?c?>, d = unpack(t)
]]

-- Test for overflow in circular resolve, only pass requirement is no overflow
TEST 'Callback<string>' [[
--- @alias Success fun(): Success
--- @alias Callback<T> fun(): Success, T

--- @return Success
local function success()
    return success
end

--- @generic T
--- @param callback Callback<T>
--- @return Callback<T>
local function make_callback(callback)
    return callback
end

local <?callback?> = make_callback(function()
    return success, ""
end)
]]

TEST 'table' [[
function f(...args)
    print(<?args?>)
end
]]

TEST 'integer' [[
---@class Foo<T>
---@field a T

---@class Bar: Foo<integer>

---@type Bar
local x
local <?what?> = x.a
]]

TEST 'string' [[
---@class GenericBase<T>
---@field value T

---@class StringHolder: GenericBase<string>

---@type StringHolder
local holder
local <?v?> = holder.value
]]

TEST 'boolean' [[
---@class Container<K, V>
---@field key K
---@field val V

---@class BoolContainer: Container<string, boolean>

---@type BoolContainer
local c
local <?b?> = c.val
]]

TEST 'string' [[
---@class Container<K, V>
---@field key K
---@field val V

---@class BoolContainer: Container<string, boolean>

---@type BoolContainer
local c
local <?k?> = c.key
]]

TEST 'string' [[
---@class Box<T>
---@field value T
local Box = {}

---@return T
function Box:getValue()
    return self.value
end

---@type Box<string>
local b

local <?v?> = b:getValue()
]]

TEST 'integer' [[
---@class Wrapper<V>
---@field item V
local Wrapper = {}

---@return V
function Wrapper:unwrap()
    return self.item
end

---@type Wrapper<integer>
local w

local <?result?> = w:unwrap()
]]

-- Issue #1856: Generic class display format
-- Generic class with resolved type parameters
TEST 'list<string>|{ [integer]: string }' [[
---@class list<T>: {[integer]:T}

---@generic T
---@param class `T`
---@return list<T>
local function new_list(class)
    return {}
end

local <?strings?> = new_list('string')
]]

-- Issue #1853: Recursive expansion on hover of generic type
-- Self-referential generic classes should not expand infinitely
TEST 'store<string>' [[
---@class store<T>: {set:fun(self:store<T>, key:integer, value:T), get:fun(self:store<T>, key:integer):T}

local <?string_store?> ---@type store<string>
]]

-- Test composite return types with generics (T[] should resolve to string[])
TEST 'string[]' [[
---@class Container<T>
local Container = {}

---@return T[]
function Container:getAll()
    return {}
end

---@type Container<string>
local c

local <?items?> = c:getAll()
]]

-- Test nested generic return types (Wrapper<T> should resolve to Wrapper<string>)
TEST 'Wrapper<string>' [[
---@class Wrapper<V>
---@field value V

---@class Factory<T>
local Factory = {}

---@return Wrapper<T>
function Factory:wrap()
    return {}
end

---@type Factory<string>
local f

local <?wrapped?> = f:wrap()
]]

-- Issue #723: Generics in @overload
-- @generic should work with @overload annotations
TEST 'string' [[
---@generic T
---@param x T
---@return T
---@overload fun(x: T): T
local function identity(x)
    return x
end

local <?result?> = identity("hello")
]]

-- Issue #723: Multiple generics in @overload
TEST 'integer' [[
---@generic K, V
---@param k K
---@param v V
---@return V
---@overload fun(k: K, v: V): V
local function getValue(k, v)
    return v
end

local <?result?> = getValue("key", 42)
]]

-- Issue #1170: Generics in function type format (fun<T>)
TEST 'string' [[
---@type fun<T>(x: T): T
local identity

local <?result?> = identity("hello")
]]

-- Issue #1170: Multiple generics in function type
TEST 'boolean' [[
---@type fun<K, V>(k: K, v: V): V
local getSecond

local <?result?> = getSecond("key", true)
]]

-- Issue #1170: Generic function in @field
TEST 'integer' [[
---@class Mapper
---@field transform fun<T, U>(input: T, fn: fun(x: T): U): U

---@type Mapper
local m

local <?result?> = m.transform("hello", function(x) return #x end)
]]

-- Issue #1532: Promise-like method chaining
-- Method returning self-type should preserve generic param through chain
TEST 'string' [[
---@class Promise<T>
---@field value T
local Promise = {}

---@return Promise<T>
function Promise:next(fn)
    return self
end

---@return T
function Promise:await()
    return self.value
end

---@type Promise<string>
local p

local <?result?> = p:next(function() end):await()
]]

-- Issue #1532: Multiple chained methods
TEST 'number' [[
---@class Chain<V>
local Chain = {}

---@return Chain<V>
function Chain:map(fn)
    return self
end

---@return Chain<V>
function Chain:filter(fn)
    return self
end

---@return V
function Chain:first()
    return nil
end

---@type Chain<number>
local c

local <?result?> = c:map(function() end):filter(function() end):first()
]]

-- Issue #1000: Generic self parameter should resolve to concrete type
-- When @generic T and @param self T, calling on List<number> should return List<number>
TEST 'List<number>' [[
---@class List<V>
local List = {}

---@generic T
---@param self T
---@return T
function List:identity()
    return self
end

---@type List<number>
local mylist

local <?result?> = mylist:identity()
]]

-- Discussion #3438: Method-level generic return type not clobbered by receiver block
-- When a generic class method has @return R where R is method-only (not in class genericMap),
-- the receiver block should not overwrite Round 1's correct resolution.
TEST 'integer' [[
---@class MyClass<T>
local MyClass = {}

---@generic R
---@param val R
---@return R
function MyClass:pass(val) return val end

---@type MyClass<string>
local myClass

local <?result?> = myClass:pass(42)
]]
