[dmd-internals] Strange assumption in FuncDeclaration::semantic

[Daniel Murphy]

When making other changes to the compiler, I managed to trigger a crash at

https://github.com/D-Programming-Language/dmd/blob/master/src/func.c#L476

The line above calls isFuncDeclaration, then there is no check before using
the result.

Is it valid to assume baseClass->search will always return either null or a
FuncDeclaration?

I think I'm missing something here.

Thanks,
Daniel.
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