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[1 of 3] Processing p
[1 of 2] Compiling A[sig] ( p\A.hsig, nothing )
[2 of 2] Compiling B ( p\B.hs, nothing )
[2 of 3] Processing a
Instantiating a
[1 of 1] Compiling A ( a\A.hs, bkpfail45.out\a\A.o )
[3 of 3] Processing q
Instantiating q
[1 of 1] Including p[A=a:A]
Instantiating p[A=a:A]
[1 of 2] Compiling A[sig] ( p\A.hsig, bkpfail45.out\p\p-KvF5Y9pEVY39j64PHPNj9i\A.o )
bkpfail45.bkp:14:9: error: [GHC-15843]
• Type constructor ‘T’ has conflicting definitions in the module
and its hsig file.
Main module: type role T phantom
type T :: * -> *
data T a = T
Hsig file: type role T nominal
type T :: * -> *
data T a = T
The roles do not match.
• While checking that ‘a:A’ implements signature ‘A’ in ‘p[A=a:A]’.
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