pprFamInstLHS drops parentheses

If I say

data family (a + b) c d

data instance (Int + Bool) Double = Float

GHC says

    • Expecting one more argument to ‘Int + Bool Double’
      Expected a type, but ‘Int + Bool Double’ has kind ‘* -> *’
    • In the data instance declaration for ‘+’

Note the missing parens in the first line of the error.

Will fix shortly.

Trac metadata

Trac field	Value
Version	8.6.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
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