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T9109.hs:8:13: error:
• Could not deduce ‘p ~ Bool’
from the context: a ~ Bool
bound by a pattern with constructor: GBool :: G Bool,
in an equation for ‘foo’
at T9109.hs:8:5-9
‘p’ is a rigid type variable bound by
the inferred type of foo :: G a -> p
at T9109.hs:8:1-16
• In the expression: True
In an equation for ‘foo’: foo GBool = True
• Relevant bindings include foo :: G a -> p (bound at T9109.hs:8:1)
Suggested fix: Consider giving ‘foo’ a type signature
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