[Issue 20821] Aliased template method confuses overload resolution

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20821

Basile-z <b2.temp at gmx.com> changed:

           What    |Removed                     |Added
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           Keywords|                            |rejects-valid
                 CC|                            |b2.temp at gmx.com

--- Comment #2 from Basile-z <b2.temp at gmx.com> ---
overload insertion in the problematic example happens here:

https://github.com/dlang/dmd/blob/b81f10c4b62bb55813f031ee18ef7f4d08cfcb80/src/dmd/declaration.d#L784-L791

something is missing when the symbol is a OverDeclaration created at this
place. When replaced with an OverloadSet the TC works but a couple of things
break in the test suite.

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