mg_arg_tys in MatchGroup should be a PostTc field
It appears that mg_arg_tys is only populated after typechecking but the type does not indicate this.
Instead of
mg_arg_tys :: [PostTc p Type]the type should be
mg_arg_tys :: PostTc p [Type]All that needs doing is modifying this type in compiler/HsSyn/HsExpr.hs and then fixing the resulting compiler errors.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 8.2.2 |
| Type | Task |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
| Differential revisions | |
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| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |