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T12844.hs:12:9: warning: [-Wpartial-type-signatures (in -Wdefault)]
• Found type wildcard ‘_’
standing for ‘(Foo rngs, Head rngs ~ '(r, r'))’
Where: ‘rngs’, ‘r’, ‘k’, ‘r'’, ‘k1’
are rigid type variables bound by
the inferred type of
bar :: (Foo rngs, Head rngs ~ '(r, r')) => FooData rngs
at T12844.hs:13:1-9
• In the type signature: bar :: _ => FooData rngs
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