[Issue 17186] Type inference for parameters with default argument

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=17186

--- Comment #3 from Stefan Koch <uplink.coder at gmail.com> ---
(In reply to Jacob Carlborg from comment #2)
> It's already allowed for the return type.

Which already wrecks havoc when trying to generate headers.

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