Fix error message when variables in a static form are not in scope

If an identifier is out-of-scope but inside a static form (static f) then GHC says expression not closed, when really it should just say identifier out of scope.

t.hs:6:5: error:
    Only identifiers of top-level bindings can appear in the body of the static form:
      static f
    but the following identifiers were found instead:
      f

We just want:

t.hs:6:12: error: Not in scope: ‘f’

Trac metadata

Trac field	Value
Version	7.10.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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