[Webkit-unassigned] [Bug 106176] Non-helpful SyntaxError message for duplicate parameters in strict mode

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=106176

--- Comment #2 from Joseph Pecoraro <joepeck at webkit.org> ---
Compare to our error message for classes and arrow functions which force the stricter parsing, these are more helpful because they even note the duplicate parameter:

js> (class { f(a,a){} })
Cannot declare a parameter named 'a' in strict mode as it has already been declared.:1
js> (class { f(a,a){''} })
Cannot declare a parameter named 'a' in strict mode as it has already been declared.:1
js> (class { f(a,a){return a} })
Cannot declare a parameter named 'a' in strict mode as it has already been declared.:1
js> (a,a) => {}
Duplicate parameter 'a' not allowed in an arrow function.:1
js> (a,a) => {''}
Duplicate parameter 'a' not allowed in an arrow function.:1
js> (a,a) => {return a}
Duplicate parameter 'a' not allowed in an arrow function.:1

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