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Auto merge of #693 - Aaron1011:feature/panic_unwind_final, r=oli-obk
Support unwinding after a panic Fixes #658 This commit adds support for unwinding after a panic. It requires a companion rustc PR to be merged, in order for the necessary hooks to work properly. Currently implemented: * Selecting between unwind/abort mode based on the rustc Session * Properly popping off stack frames, unwinding back the caller * Running 'unwind' blocks in Mir terminators Not yet implemented: * 'Abort' terminators This PR was getting fairly large, so I decided to open it for review without implementing 'Abort' terminator support. This could either be added on to this PR, or merged separately. I've a test to exercise several different aspects of unwind panicking. Ideally, we would run Miri against the libstd panic tests, but I haven't yet figured out how to do that. This depends on rust-lang/rust#60026
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