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werror.hs:6:1: error: [-Wmissing-signatures (in -Wall), -Werror=missing-signatures]
Top-level binding with no type signature: main :: IO ()
werror.hs:7:13: error: [-Wname-shadowing (in -Wall), -Werror=name-shadowing]
This binding for ‘main’ shadows the existing binding
defined at werror.hs:6:1
werror.hs:7:13: error: [-Wunused-local-binds (in -Wextra, -Wunused-binds), -Werror=unused-local-binds]
Defined but not used: ‘main’
werror.hs:8:1: error: [-Wtabs (in -Wdefault), -Werror=tabs]
Tab character found here.
Please use spaces instead.
werror.hs:10:1: error: [-Wunused-top-binds (in -Wextra, -Wunused-binds), -Werror=unused-top-binds]
Defined but not used: ‘f’
werror.hs:10:1: error: [-Wmissing-signatures (in -Wall), -Werror=missing-signatures]
Top-level binding with no type signature: f :: [a1] -> [a2]
werror.hs:10:1: error: [-Wincomplete-patterns (in -Wextra), -Werror=incomplete-patterns]
Pattern match(es) are non-exhaustive
In an equation for ‘f’: Patterns of type ‘[a]’ not matched: (_:_)
werror.hs:11:1: error: [-Woverlapping-patterns (in -Wdefault), -Werror=overlapping-patterns]
Pattern match is redundant
In an equation for ‘f’: f [] = ...
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