GHC doesn't warn on typos in language pragmas

In particular, I was struggling with the QuasiQuotes language extension. I had -

{-# LANGAUGE QuasiQuotes #-}

site = [shamelet|Hello World!|]

Notice the transposed A and U in LANGUAGE

The error that ghc was emitting was - Main.hs:23:47: parse error on input ‘]’

It took me a long time and a lot of head-banging to figure out that it was a typo in the language pragma, especially because the language pragma was surrounded by other language pragmas and it was at the top of the file.

I would think that this should at least emit a warning when there is a typo in a pragma.

Trac metadata

Trac field	Value
Version	7.8.4
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
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Blocking
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Architecture	Unknown/Multiple