3.2.0-dev: StackThunk optimistic_yield was not declared in this scope

[InnuendoPi]

...\cores\esp8266\StackThunk.cpp: In function 'void stack_thunk_yield()':
...\cores\esp8266\StackThunk.cpp:155:5: error: 'optimistic_yield' was not declared in this scope
155 | optimistic_yield(10000);
| ^~~~~~~~~~~~~~~~

adding extern void optimistic_yield solves compile error

...
extern "C" {
extern void optimistic_yield(uint32_t);
uint32_t *stack_thunk_ptr = NULL;
...