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Roles12.hs:6:1: error: [GHC-15843]
Type constructor ‘T’ has conflicting definitions in the module
and its hs-boot file.
Main module: type role T phantom
type T :: * -> *
data T a
Boot file: type T :: * -> *
data T a
The roles do not match.
NB: roles on abstract types default to ‘representational’ in hs-boot files.
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