
HISTORY: <>
 ACTIVE: unhandled

HISTORY: <>
 ACTIVE: main handler
 CALLED: main handler

HISTORY: < 1|>
 ACTIVE: normal sub handler
 CALLED: normal sub handler

HISTORY: <>
 ACTIVE: main handler
 CALLED: main handler

HISTORY: < 1|>
 ACTIVE: recursive sub handler
 CALLED: recursive sub handler

HISTORY: < 3| 1|>
 ACTIVE: recursive sub handler
 CALLED: recursive sub handler

HISTORY: < 3| 3| 1|>
 ACTIVE: recursive sub handler
 CALLED: recursive sub handler

HISTORY: < 3| 1|>
 ACTIVE: recursive sub handler

HISTORY: < 1|>
 ACTIVE: recursive sub handler

HISTORY: <>
 ACTIVE: main handler
 CALLED: main handler

HISTORY: <>
 ACTIVE: unhandled
