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First, the ES5 fallback in
reallyParse
is now unnecessary because the bug is now fixed in acorn, although a major bump is required since ES6 and ES5 are not fully compatible.Second, a bug-fix in the AST walker made the walker now go through CatchClause as well, changing the number of parents before the
param
property while making it possible to attach the locals on the entire CatchClause, which is a cleaner solution.