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T9171.hs:10:20: error:
• Couldn't match expected type ‘GetParam
@* @k2 @* Base (GetParam @* @* @k2 Base Int)’
with actual type ‘GetParam
@* @k20 @* Base (GetParam @* @* @k20 Base Int)’
NB: ‘GetParam’ is a non-injective type family
The type variable ‘k20’ is ambiguous
• In the ambiguity check for an expression type signature
To defer the ambiguity check to use sites, enable AllowAmbiguousTypes
In an expression type signature: GetParam Base (GetParam Base Int)
In the expression: undefined :: GetParam Base (GetParam Base Int)
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