Error message to suggest rewriting some syntax as a function call

[goretkin]

Perhaps it is worth making these work automatically:

@fix "not a call $(_)"
@fix (:not_a_call, _))
@fix (;a=:not_a_call, b=_)))

I think instead they should just error and provide a suggestion to rewrite like

@fix string("a call ", _)
@fix tuple(:a_call, _)
@fix NamedTuple{(:a, :b)}(@fix tuple(:a_call, _))

(the last one requires #17)