[Issue 23626] [REG2.096] Template deduction with auto const ref Args... and delegate

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23626

Iain Buclaw <ibuclaw at gdcproject.org> changed:

           What    |Removed                     |Added
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                 CC|                            |ibuclaw at gdcproject.org
           See Also|                            |https://issues.dlang.org/sh
                   |                            |ow_bug.cgi?id=21518

--- Comment #2 from Iain Buclaw <ibuclaw at gdcproject.org> ---
(In reply to johanengelen from comment #1)
> This frontend change "fixes" the errors (3 lines removed):
> diff dmd/mtype.d:
> ```
>     /** Extends TypeNext.constConv by also checking for matching attributes
> **/
>     override MATCH constConv(Type to)
>     {
> -        // Attributes need to match exactly, otherwise it's an implicit
> conversion
> -        if (this.ty != to.ty || !this.attributesEqual(cast(TypeFunction)
> to))
> -            return MATCH.nomatch;
> ```
Those three lines come from https://github.com/dlang/dmd/pull/12090 which was
first released in v2.096.0.  This conveniently fits your timeline, so is a
possible introducer of the regression.

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