Function.prototype.name getter brokes function name getter

[ColCh]

This code breaks Function.prototype.name in 100% of cases

var funcNameBeforeProtoCall = (function bar() {}).name
var funcNameBeforeProtoCallEquals = funcNameBeforeProtoCall === 'bar';
debugger;
Function.prototype.name;
var funcNameAfterProtoCall = (function foo() {}).name
var funcNameAfterProtoCallEquals = funcNameAfterProtoCall === 'foo';
debugger

launchable code: https://codepen.io/ColCh/pen/Oqpqqp

Try it in IE 11 and this would be resulted in this:

WHY ?!

Because this code is executed against this variable of Function.prototype

es6-shim/es6-sham.js

Lines 158 to 159 in 271142c

	var match = _call(_strMatch, str, /\s*function\s+([^(\s]*)\s*/);
	var name = match && match[1];

and this code assigns getter with for Function.prototype name property with null value.

es6-shim/es6-sham.js

Lines 160 to 165 in 271142c

	Object.defineProperty(this, 'name', {
	configurable: true,
	enumerable: false,
	writable: false,
	value: name
	});

Solution: skip defineProperty for null names

[ljharb]

ah, that's a really good catch - I don't think we ever expected anyone would refer to the name getter directly. Fix incoming.

[ColCh]

Omg that was fast! Thank you!