Make the "extract" functions in RnTypes pure
Once upon a time, the extract functions at the bottom of RnTypes were pure. Then, along came -XTypeInType, which needed to do a check in these functions for users mixing type variables with kind variables. Now, however, with -XTypeInType gone again, we no longer do this check. Thus, there is no reason to keep these functions monadic.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 8.6.1 |
| Type | Task |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
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