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’