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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:
• 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.
Roles on abstract types default to ‘representational’ in boot files.
• while checking that a:A implements signature A in p[A=a:A]
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