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T15692.hs:9:18: warning: [-Wdeferred-type-errors (in -Wdefault)]
• Couldn't match expected type ‘F (f x)’ with actual type ‘Bool’
• In the pattern: False
In the pattern: FS False
In the declaration for pattern synonym ‘FS'’
T15692.hs:9:18: warning: [-Wdeferred-type-errors (in -Wdefault)]
• Couldn't match expected type ‘F (f0 x)’ with actual type ‘Bool’
• In the first argument of ‘FS’, namely ‘False’
In the expression: FS False
In an equation for ‘FS'’: FS' = FS False
• Relevant bindings include $bFS' :: F x (bound at T15692.hs:9:9)
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