Fix parsing of lambda parameter named "scoped"

[jjonescz]

Fixes #63469

[AlekseyTs]

@jjonescz The underlying issue is probably fixed in #64088. Could you confirm that? If so, then let's wait for that PR to go in and adjust this one to only add tests.

[jjonescz]

The underlying issue is probably fixed in #64088. Could you confirm that?

Yes, it's fixed, except the last of my tests (ScopedAsParameterName_06) does not pass, i.e., this code is not reporting any errors (I am not sure whether it should?):

(scoped scoped) => { }

The tree also does not contain ScopedKeyword; it looks like this:

N(SyntaxKind.ParenthesizedLambdaExpression);
{
    N(SyntaxKind.ParameterList);
    {
        N(SyntaxKind.OpenParenToken);
        N(SyntaxKind.Parameter);
        {
            N(SyntaxKind.IdentifierName);
            {
                N(SyntaxKind.IdentifierToken, "scoped");
            }
            N(SyntaxKind.IdentifierToken, "scoped");
        }
        N(SyntaxKind.CloseParenToken);
    }
    N(SyntaxKind.EqualsGreaterThanToken);
    N(SyntaxKind.Block);
    {
        N(SyntaxKind.OpenBraceToken);
        N(SyntaxKind.CloseBraceToken);
    }
}
EOF();

Also feel free to just copy my tests into your branch and close this PR if that would be simpler.

[AlekseyTs]

this code is not reporting any errors

This matches my expectations and the syntax tree looks good to me a s well.

[AlekseyTs]

LGTM (commit 4). This is a test only change, this means it can be merged with a single sign-off. Please squash commits and adjust the comment to accurately reflect the nature of the change (an addition of tests) while merging.