Function getTupleElementLabel

test/fixtures/snapshot/typescript.js:77475–77478

(d)

            return type;
        }
        function getTupleElementLabel(d) {
            ts.Debug.assert(ts.isIdentifier(d.name)); // Parameter declarations could be binding patterns, but we only allow identifier names
            return d.name.escapedText;
        }
        function getParameterNameAtPosition(signature, pos, overrideRestType) {
            var paramCount = signature.parameters.length - (signatureHasRestParameter(signature) ? 1 : 0);
            if (pos < paramCount) {