Template Haskell's Exact names don't shadow correctly
Having two Exact names shadow one another confuses the renamer. In particular, if an Exact name is used twice in kind annotations of a type declaration, the hsq_implicit field of the HsQTyVars gets a duplicate. I've been unable to cause harm with this, but it's definitely wrong as is.
Fix en route.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 8.1 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Template Haskell |
| Test case | |
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