Add a failing test illustrating a renaming bug in ES6 output.

test/form/external-import-alias-shadow/_config.js

@@ -0,0 +1,6 @@
+module.exports = {
+	description: 'handles external aliased named imports that shadow another name',
+	options: {
+		external: [ 'acorn' ]
+	}
+};

test/form/external-import-alias-shadow/_expected/amd.js

@@ -0,0 +1,9 @@
+define(['acorn'], function (acorn) { 'use strict';
+
+	function parse(source) {
+		return acorn.parse(source, { ecmaVersion: 6 });
+	}
+
+	console.log(parse('foo'));
+
+});

test/form/external-import-alias-shadow/_expected/cjs.js

@@ -0,0 +1,9 @@
+'use strict';
+
+var acorn = require('acorn');
+
+function parse(source) {
+	return acorn.parse(source, { ecmaVersion: 6 });
+}
+
+console.log(parse('foo'));

test/form/external-import-alias-shadow/_expected/es6.js

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+import { parse } from 'acorn';
+
+function parse$$(source) {
+	return parse(source, { ecmaVersion: 6 });
+}
+
+console.log(parse$$('foo'));

test/form/external-import-alias-shadow/_expected/iife.js

@@ -0,0 +1,10 @@
+(function (acorn) {
+	'use strict';
+
+	function parse(source) {
+		return acorn.parse(source, { ecmaVersion: 6 });
+	}
+
+	console.log(parse('foo'));
+
+}(acorn));

test/form/external-import-alias-shadow/_expected/umd.js

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+(function (global, factory) {
+	typeof exports === 'object' && typeof module !== 'undefined' ? factory(require('acorn')) :
+	typeof define === 'function' && define.amd ? define(['acorn'], factory) :
+	(factory(global.acorn));
+}(this, function (acorn) { 'use strict';
+
+	function parse(source) {
+		return acorn.parse(source, { ecmaVersion: 6 });
+	}
+
+	console.log(parse('foo'));
+
+}));

test/form/external-import-alias-shadow/main.js

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+import parse from './parse';
+
+console.log(parse('foo'));

test/form/external-import-alias-shadow/parse.js

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+import { parse as acornParse } from 'acorn';
+
+export default function parse(source) {
+	return acornParse(source, { ecmaVersion: 6 });
+}