Matthew Olsson 419bce6915 LibJS: Fix syntax error for arrow function non-decl variable assignment ...

A regression was introduced in dc9b4da where the parser would
incorrectly parse the assignment of arrow functions to (non-declaration)
variables. For example, consider:

    a = () => {}

Because the parser was aware of default parameters, in
try_parse_arrow_function, the equals sign would be interpreted as a
default argument, leading to incorrect parsing of the overall
expression. Also resulted in some funny behavior
(a = () => {} => {} worked just fine!).

The simple fix is to only look for default parameters if the arrow
function is required to have parenthesis.

2020-05-06 12:21:29 +02:00

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