[Issue 22025] Exception within a delegate can't be thrown.

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22025

Mathias LANG <pro.mathias.lang at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pro.mathias.lang at gmail.com

--- Comment #1 from Mathias LANG <pro.mathias.lang at gmail.com> ---
Reproduced.

```
(lldb) bt
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS
(code=2, address=0x1003c7c00)
  * frame #0: 0x00007fff2032f50c libsystem_pthread.dylib`___chkstk_darwin + 96
    frame #1: 0x00007fff2032f4ac libsystem_pthread.dylib`thread_start + 20
    frame #2: 0x00007fff2a4adb2d
libunwind.dylib`libunwind::UnwindCursor<libunwind::LocalAddressSpace,
libunwind::Registers_x86_64>::getInfoFromDwarfSection(unsigned long,
libunwind::UnwindInfoSections const&, unsigned int) + 191
    frame #3: 0x00007fff2a4ada01
libunwind.dylib`libunwind::UnwindCursor<libunwind::LocalAddressSpace,
libunwind::Registers_x86_64>::setInfoBasedOnIPRegister(bool) + 999
    frame #4: 0x00007fff2a4afec9
libunwind.dylib`libunwind::UnwindCursor<libunwind::LocalAddressSpace,
libunwind::Registers_x86_64>::step() + 461
    frame #5: 0x00007fff2a4b1a18 libunwind.dylib`_Unwind_RaiseException + 189
    frame #6: 0x000000010005c0fd future`_d_throwdwarf + 185
    frame #7: 0x0000000100001e9d
future`_D4mainQfFZ9__lambda3MFNaNfiZi(__capture=0x0000000100600000, x=30) at
object.d:2478
    frame #8: 0x0000000100025aea
future`_D7toolkit7promise__T9asyncImplTDFNaNfiZiTiZQxFQpiZ9__lambda6MFZv(__capture=0x0000000100604030)
at promise.d:446
    frame #9: 0x0000000100058d79
future`_D4core6thread7context8Callable6opCallMFZv + 41
    frame #10: 0x0000000100055227 future`fiber_entryPoint + 99
```

I've been seeing this issue for a while:
https://github.com/dlang/dub/issues/2120

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