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rustc_const_unstable attribute ignored in const promotion #50901

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oli-obk opened this issue May 19, 2018 · 0 comments · Fixed by #50909
Closed

rustc_const_unstable attribute ignored in const promotion #50901

oli-obk opened this issue May 19, 2018 · 0 comments · Fixed by #50909
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A-const-eval Area: Constant evaluation (MIR interpretation) A-const-fn Area: const fn foo(..) {..}. Pure functions which can be applied at compile time. C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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oli-obk commented May 19, 2018 

let x: &'static _ = &std::time::Duration::from_millis(42).subsec_millis();

works on nightly but not on beta, because the subsec_millis function wasn't unstably const fn when beta was split off.
@oli-obk oli-obk added T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. A-const-fn Area: const fn foo(..) {..}. Pure functions which can be applied at compile time. C-bug Category: This is a bug. WG-compiler-const A-const-eval Area: Constant evaluation (MIR interpretation) labels May 19, 2018
@oli-obk oli-obk mentioned this issue May 24, 2018
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bors added a commit that referenced this issue May 24, 2018
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Auto merge of #50909 - oli-obk:unstable_const_fn_promotion, r=eddyb
0746522 
Enforce stability of const fn in promoteds

r? @eddyb

fixes #50901

what's going on here? Why do we have two promoted computation algorithms?
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A-const-eval Area: Constant evaluation (MIR interpretation) A-const-fn Area: const fn foo(..) {..}. Pure functions which can be applied at compile time. C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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Enforce stability of const fn in promoteds oli-obk/rust
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