screwy deshadowing logic - failing test case

test/function/deshadow-top-level-declaration/_config.js

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+module.exports = {
+	solo: true,
+	description: 'deshadows top-level declarations'
+};

test/function/deshadow-top-level-declaration/a.js

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+import './x';

test/function/deshadow-top-level-declaration/b.js

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+import { foo as _foo } from './foo';
+
+export default function foo () {
+	_foo();
+}

test/function/deshadow-top-level-declaration/foo.js

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+function foo () {}
+
+export { foo };

test/function/deshadow-top-level-declaration/main.js

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+import './foo';
+import './a';
+import b from './b';
+
+assert.equal( typeof b, 'function' );

test/function/deshadow-top-level-declaration/x.js

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+import { foo } from './foo';
+
+function x () {
+	foo();
+}