Better forward recovery of variable/function declarations with missing variable/function keyword.

[rhdunn]

Function-like declarations:

declare test() { ... };
               ^-------- Should not report an error, as an error has been reported.

Variable-like declarations:

declare test := 2;
        ^-------- Should not report an error, as an error has been reported.

declare $test := 2;
              ^-------- Should not report an error, as an error has been reported.