Disambiguate const array literals from parenthesized primary expressions #292
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This PR fixes a parsing bug where const array literal expressions would be confused with parenthesized primary expressions.
The official parser builds type information incrementally during parsing and relies on it to know what may appear on the right side of an assignment (which is another point in favor of #261).
With our current approach to parsing, the fix for this problem is a slightly gnarly repetition of rules in the ANTLR3 grammar.