Pragmas after a module declaration are ignored without warning.
Normally pragmas are placed above the module declaration like so:
{-# LANGUAGE OverloadedStrings #-}
module Main where
However if the above 2 lines are flipped around like this:
module Main where
{-# LANGUAGE OverloadedStrings #-}
Then the behaviour seen by a user is that equivalent to the pragma not being present, because it would appear GHC ignores the multi-line comment it looks like.
For a novice (I'm not one but it just tripped me up) this would be incredibly baffling (it was for me), it would be nice to see a warning for this at the least.
Trac metadata
Trac field | Value |
---|---|
Version | 7.10.3 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
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Blocking | |
CC | |
Operating system | |
Architecture |