'toString' is supposed to be a valid operation argument name

[nektro]

Under https://webidl.spec.whatwg.org/#idl-names

The identifier of any of the abovementioned IDL constructs (except operation arguments) must not be "constructor", "toString", or begin with a U+005F (_). These are known as reserved identifiers.

this is to have users use Constructor and Stringifier respectively.

however, taking note of the exception, it appears the following code should pass even though today it fails the checker:

[Exposed]
interface Foo {
  undefined foo(int toString);
};

WebIDLParseError: Syntax error at line 3:
  undefined foo(int toString
                    ^ toString is a reserved identifier and must not be used.

[saschanaz]

Ah "(except operation arguments)". Thanks for reporting.

[nektro]

fwiw i prefer the checker's current behavior, but since it currently disagrees with the spec as-written I wanted to have a paper trail. currently searching to see if i can find the historical reason that exception was originally added.

[nektro]

did some more playing around. i rescind the previous comment.