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[1 of 3] Processing p
[1 of 1] Compiling A[sig] ( p\A.hsig, nothing )
[2 of 3] Processing q
[1 of 1] Compiling A[sig] ( q\A.hsig, nothing )
[3 of 3] Processing r
[1 of 3] Compiling A[sig] ( r\A.hsig, nothing )
bkpfail47.bkp:10:9: error: [GHC-15843]
• Type constructor ‘T’ has conflicting definitions in the module
and its hsig file.
Main module: type role T representational nominal
type T :: * -> * -> *
data T a b = MkT
Hsig file: type role T nominal representational
type T :: * -> * -> *
data T a b
The roles are not compatible:
Main module: [nominal, representational]
Hsig file: [representational, nominal]
• while merging the signatures from:
• p[A=<A>]:A
• q[A=<A>]:A
• ...and the local signature for A
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