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Fix ICE in resolve #32813

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jseyfried
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This fixes #32797, a regression caused by a bug in which we try to mutate a borrowed RefCell. The bug was introduced in #32328 (second to last commit).
r? @nikomatsakis

@@ -332,6 +332,7 @@ impl<'a> ::ModuleS<'a> {

fn define_in_glob_importers(&self, name: Name, ns: Namespace, binding: &'a NameBinding<'a>) {
if !binding.defined_with(DefModifiers::PUBLIC | DefModifiers::IMPORTABLE) { return }
let _resolutions = self.resolutions.borrow();
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A comment here, preferably one citing some example source, would be fantastic. e.g. I can kind of guess why this makes sense, but it's not at all obvious.

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Will do. This is actually somewhat of a hack -- see #32814

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Closing in favor of #32814.

@jseyfried jseyfried closed this Apr 11, 2016
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ICE: thread 'rustc' panicked at 'RefCell<T> already borrowed', ../src/libcore/cell.rs:444
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