Make capture-by-ref unboxed closures work #17731
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…losures This prevents a later ICE in borrowck. Closes issue rust-lang#17655
In particular, this causes mutation of an upvar to correctly mark it as mutable during adjustment. This makes borrowck correctly flag conflicting borrows, etc. We still seem to generate incorrect code in trans which copies the upvar by value into the closure. This remains to be fixed.
Treat upvars of capture-by-reference unboxed closures as references with appropriate regions and mutability.
Store references to the freevars instead of copies when constructing the environment and insert an additional load when reading them from the environment.
This test works as a regression test for issue rust-lang#17655. It also exercises mutation of by-ref upvars.
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r? @pcwalton |
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This looks good. Could you add some tests for |
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Added some more tests. |
This was referenced Oct 17, 2014
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perf: Segregate syntax and semantic diagnostics Closes rust-lang#17731
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This began as an attempt to fix an ICE in borrowck (issue #17655), but the rabbit hole went pretty deep. I ended up plumbing support for capture-by-reference unboxed closures all the way into trans.
Closes issue #17655.