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Top level module identifiers shadow imported identifiers

Let's try this out as a language pragma and see if we like it?

Artificial example:

{-# LANGUAGE TopLevelShadowsImports #-}
import Data.Monoid
(<>) = mappend
main = putStrLn ("Hello" <> " " <> "World")

Current behavior: error: ambiguous occurrence of (<>) Desired behavior: uses top-level definition of (<>), prints "hello world"

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Type FeatureRequest
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
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