bors 5849a7eca9 Auto merge of #77594 - timvermeulen:chain_advance_by, r=scottmcm ... Implement advance_by, advance_back_by for iter::Chain Part of #77404. This PR does two things: - implement `Chain::advance[_back]_by` in terms of `advance[_back]_by` on `self.a` and `advance[_back]_by` on `self.b` - change `Chain::nth[_back]` to use `advance[_back]_by` on `self.a` and `nth[_back]` on `self.b` This ensures that `Chain::nth` can take advantage of an efficient `nth` implementation on the second iterator, in case it doesn't implement `advance_by`. cc `@scottmcm` in case you want to review this		2020-10-06 10:17:48 +00:00
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alloc	Rollup merge of #77514 - scottmcm:less-once-chain-once, r=estebank	2020-10-05 02:29:42 +02:00
backtrace@4083a90168	std: Switch from libbacktrace to gimli	2020-07-28 16:34:01 -07:00
core	Auto merge of #77594 - timvermeulen:chain_advance_by, r=scottmcm	2020-10-06 10:17:48 +00:00
panic_abort	Rollup merge of #76866 - est31:master, r=lcnr	2020-09-20 15:51:50 +02:00
panic_unwind	library/{panic_,}unwind: Add definitions for sparc-unknow-linux-gnu	2020-09-28 00:39:57 +02:00
proc_macro	Add a feature gate for basic function pointer use in const fn	2020-09-27 10:46:41 -07:00
profiler_builtins	Fix warning whe building profiler_builtins crate	2020-09-04 15:10:29 +02:00
rtstartup	mv std libs to library/	2020-07-27 19:51:13 -05:00
rustc-std-workspace-alloc	mv std libs to library/	2020-07-27 19:51:13 -05:00
rustc-std-workspace-core	mv std libs to library/	2020-07-27 19:51:13 -05:00
rustc-std-workspace-std	mv std libs to library/	2020-07-27 19:51:13 -05:00
std	Rollup merge of #77528 - tamird:avoid-cast-net-parser, r=dtolnay	2020-10-06 16:26:02 +09:00
stdarch@3c3664355e	Update stdarch submodule	2020-10-01 13:06:22 -04:00
term	mv std libs to library/	2020-07-27 19:51:13 -05:00
test	Rollup merge of #77389 - jyn514:THE-PAPERCLIP-COMETH, r=Mark-Simulacrum	2020-10-02 08:25:24 +09:00
unwind	library/{panic_,}unwind: Add definitions for sparc-unknow-linux-gnu	2020-09-28 00:39:57 +02:00