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T11667.hs:12:22: error:
• Could not deduce ‘Num a’ arising from the literal ‘42’
from the context: Eq a
bound by the signature for pattern synonym ‘Pat1’
at T11667.hs:12:1-23
Possible fix:
add (Num a) to the "required" context of
the signature for pattern synonym ‘Pat1’
• In the pattern: 42
In the pattern: Just 42
In the declaration for pattern synonym ‘Pat1’
T11667.hs:18:28: error:
• Couldn't match type ‘b’ with ‘Bool’
arising from the "provided" constraints claimed by
the signature of ‘Pat2’
‘b’ is a rigid type variable bound by
the signature for pattern synonym ‘Pat2’
at T11667.hs:17:17-50
• In the declaration for pattern synonym ‘Pat2’
• Relevant bindings include y :: b (bound at T11667.hs:18:21)
T11667.hs:24:24: error:
• No instance for ‘Show a’
arising from the "provided" constraints claimed by
the signature of ‘Pat3’
In other words, a successful match on the pattern
Just x
does not provide the constraint (Show a)
• In the declaration for pattern synonym ‘Pat3’
T11667.hs:31:16: error:
• Could not deduce ‘Num a’ arising from a use of ‘MkS’
from the context: (Eq a, Show a)
bound by the signature for pattern synonym ‘Pat4’
at T11667.hs:31:1-21
Possible fix:
add (Num a) to the "required" context of
the signature for pattern synonym ‘Pat4’
• In the expression: MkS 42
In an equation for ‘Pat4’: Pat4 = MkS 42
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