Duplicate member signature error is not reported in signature files

[auduchinok]

There're two signatures of FSharpMemberOrFunctionOrValue.IsFunction in the signature file, and the error is not reported:

fsharp/src/Compiler/Symbols/Symbols.fsi

Line 937 in 0e8f267

member IsFunction: bool

fsharp/src/Compiler/Symbols/Symbols.fsi

Line 943 in 0e8f267

member IsFunction: bool

The issue was requested in a comment: #13824 (comment).

[edgarfgp]

@auduchinok This seems related to what I'm covering in #13964 . I can take a look after my PR is merged :) .
cc @dsyme

[abelbraaksma]

Iirc, this is a rather old bug, I thought it was reported before. We should probably add a test for this scenario?

[dsyme]

Iirc, this is a rather old bug, I thought it was reported before.

Can't see a duplicate of this