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werror.hs:6:1: warning: [-Wmissing-signatures (in -Wall)]
Top-level binding with no type signature: main :: IO ()
werror.hs:7:13: warning: [-Wname-shadowing (in -Wall)]
This binding for ‘main’ shadows the existing binding
defined at werror.hs:6:1
werror.hs:7:13: warning: [-Wunused-local-binds (in -Wextra, -Wunused-binds)]
Defined but not used: ‘main’
werror.hs:8:1: warning:
Tab character found here.
Please use spaces instead.
werror.hs:10:1: warning: [-Wunused-local-binds (in -Wextra, -Wunused-binds)]
Defined but not used: ‘f’
werror.hs:10:1: warning: [-Wmissing-signatures (in -Wall)]
Top-level binding with no type signature:
f :: forall t t1. [t] -> [t1]
werror.hs:10:1: warning: [-Wincomplete-patterns (in -Wextra)]
Pattern match(es) are non-exhaustive
In an equation for ‘f’: Patterns not matched: (_:_)
werror.hs:11:1: warning: [-Woverlapping-patterns (in -Wdefault)]
Pattern match is redundant
In an equation for ‘f’: f [] = ...
<no location info>: error:
Failing due to -Werror.
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