Ignore case when parsing language pragmas
It's annoying to have to remember exactly how a language extension is supposed to be capitalized. It seems highly unlikely that we will ever have two different language extensions that differ only by case. Therefore, I think GHC should ignore case when matching {-# LANGUAGE #-} pragmas. Thus, we should accept not only UndecidableSuperClasses but also UndecidableSuperclasses, etc.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 8.0.1 |
| Type | FeatureRequest |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler (Parser) |
| Test case | |
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