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auto merge of #12602 : alexcrichton/rust/backtrace, r=brson
Whenever a failure happens, if a program is run with `RUST_LOG=std::rt::backtrace` a backtrace will be printed to the task's stderr handle. Stack traces are uncondtionally printed on double-failure and rtabort!(). This ended up having a nontrivial implementation, and here's some highlights of it: * We're bundling libbacktrace for everything but OSX and Windows * We use libgcc_s and its libunwind apis to get a backtrace of instruction pointers * On OSX we use dladdr() to go from an instruction pointer to a symbol * On unix that isn't OSX, we use libbacktrace to get symbols * Windows, as usual, has an entirely separate implementation Lots more fun details and comments can be found in the source itself. Closes #10128
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