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ASSERT failed: TcCanonical:520 for kind-checking unsaturated type families

    • Closed Issue created by Richard Eisenberg @rae 
    {-# LANGUAGE TypeFamilies, PolyKinds #-}

type family Foo (x :: k)
    ghci> :k Foo
*** Exception: ASSERT failed! file compiler/typecheck/TcCanonical.lhs, line 520

    This was tested on a checkout from 22 May.

    Trac metadata
    Trac field Value
    Version 7.7
    Type Bug
    TypeOfFailure OtherFailure
    Priority normal
    Resolution Unresolved
    Component Compiler
    Test case
    Differential revisions
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    Operating system
    Architecture
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