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bors 2e880bb9f7 Auto merge of #131 - japaric:rustup, r=alexcrichton
CI: use a recent nightly

- add #[no_mangle] to the panic_fmt lang item to adjust to changes in
the visibility algorithm

- adjust to changes in the layout of Cargo's target directory

- use a newer Xargo to reduce the build time of the sysroot (only core
is compiled as part of the sysroot now)

r? @alexcrichton
2016-12-31 18:42:35 +00:00
library/compiler-builtins more #[no_mangle] 2016-12-31 10:04:40 -05:00