Bug 22042 – shared(delegate[]) causes dmd to fail

The minimal reproducible example: ---------------------- struct Event { } shared(void delegate()[]) onRelease; void subscribe(E)() { onRelease ~= (){}; } void main() { subscribe!Event; } ---------------------- And result (running with dub a minimal application): Performing "debug" build using /Library/D/dmd/bin/dmd for x86_64. dtest ~master: building configuration "application"... /Library/D/dmd/bin/dmd failed with exit code -11. dmd version: DMD64 D Compiler v2.097.0

Tagged as backend because the error happens in the DMD-specific glue layer (run.dlang.io suggests an assertion failure in todt.c)

Actually not a backend issue, the error is caused by a missing deco for the `TypeDelegate` which wasn't set by merge.

Worked up until 2.064 according to run.dlang.io

Further reduction: shared(void delegate()[]) onRelease; void main() { onRelease ~= (){}; }

@MoonlightSentinel created dlang/dmd pull request #13271 "Fix 22042 - Merge `funcptr` type before merging `TypeDelegate`'s" fixing this issue: - Fix 22042 - Merge `funcptr` type before merging `TypeDelegate`'s Ensures that `deco` is set for the `funcptr` (`next`) whenever possible s.t. `merge` doesn't exit early in the `default` case. Previously `TypeDelegate`s without `deco` could reach the `TypeInfo` generation and trigger the assertion due to the missing mangling string. Also could cause problems with non-unique types but didn't find a test case (yet?). https://github.com/dlang/dmd/pull/13271

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