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[1 of 1] Compiling ShouldFail[sig of Prelude] ( tcfail220.hsig, nothing )
tcfail220.hsig:4:1: error:
Type constructor ‘Either’ has conflicting definitions in the module
and its hsig file
Main module: data Either a b = Left a | Right b
Hsig file: type role Either representational phantom phantom
data Either a b c = Left a
The types have different kinds
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