Enable 'PolyKinds' in Linear.Trace #122
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This turns on 'PolyKinds' for appropriate GHC versions in 'Linear.Trace'. The particular motivation is to generalize the `instance Dim * n => Trace (V * n)` to the kind `Nat`, such that `trace m` compiles for types like `m :: V 5 (V 5 n)`. Fixes ekmett#121
RyanGlScott
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This turns on
PolyKindsfor appropriate GHC versions inLinear.Trace. The particular motivation is to generalizeto the kind
Nat, such thattrace mcompiles for types likem :: V 5 (V 5 Double).Fixes #121.