For #19: Fix an edge case parsing =
and instanceof
#228
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This does not fix every single edge case.
This only fixes the edge cases for unary operators
on the left hand side of binary operators expecting a variable.
if (!$x = expr())
is something I've seen frequently, which is why I'm fixing this here. A complete fix would probably be more complex (e.g. deeply nested binary operators)(That probably isn't even every single binary operator or unary operator)
See #19 (comment) and #19 (comment)