bad pretty-printing of types with promoted data types

> :set -XDataKinds
> :set -XPolyKinds
> data Proxy k = Proxy
> _ :: Proxy '[ 'True ]
error:
  Found hole: _ :: Proxy '['True]
>             _ :: Proxy '['True]
error:
    Invalid type signature: _ :: ...
    Should be of form <variable> :: <type>

Alternatively, this could be attributed to the parser/lexer doing an insufficient job there.

Trac metadata

Trac field	Value
Version	8.2.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
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