parser: expression parsing changes + migration-safety diagnostics#115
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breaking change: - update expression precedence/associativity (`+ - * / % &&` left-assoc, `↘/↖` at implication level, `< <= > >= !=` non-assoc) for migration safety, we compare new parse against old parser behavior and reject ambiguous changed parses. also updated tests, and unfortunately now the pgf example does not work anymore
i thought associative == has a useful application, but it doesn't
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breaking change:
+ - * / % &&left-assoc,↘/↖at implication level,< <= > >= !=non-assoc)for migration safety, we compare new parse against old parser behavior and reject ambiguous changed parses.
also updated tests, and unfortunately now the pgf example does not work anymore
fixes #112