mark std::str::replace(,n) as #[must_use]#50177
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The same reasoning applies to the |
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Just for consistency, the #[must_use] attribute usually comes before the stability attribute.
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Ok, will update. I'll wait with that + the replace() must_use attr until travis is done, in case this introduces bootstrap compiler warnings.
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Hm. I hoped this would get rid of
[00:24:20] warning: `#[must_use]` on methods is experimental (see issue #43302)
[00:24:20] --> liballoc/str.rs:211:5
[00:24:20] |
[00:24:20] 211 | #[must_use]
[00:24:20] | ^^^^^^^^^^^
[00:24:20] |
[00:24:20] = help: add #![feature(fn_must_use)] to the crate attributes to enable
[00:24:20]
[00:24:20] warning: `#[must_use]` on methods is experimental (see issue #43302)
[00:24:20] --> liballoc/str.rs:251:5
[00:24:20] |
[00:24:20] 251 | #[must_use]
[00:24:20] | ^^^^^^^^^^^
[00:24:20] |
[00:24:20] = help: add #![feature(fn_must_use)] to the crate attributes to enable
[00:24:20]
but apparently it does't. What am I doing wrong?
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You need to add #![feature(fn_must_use)] to src/liballoc/lib.rs instead.
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@bors r+ |
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📌 Commit 5d37ba1 has been approved by |
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@bors rollup |
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⌛ Testing commit 5d37ba1 with merge 765cd68743868b2c9568307cf43d5df96dc361e8... |
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💔 Test failed - status-appveyor |
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…_use, r=oli-obk
mark std::str::replace(,n) as #[must_use]
let x = "a b c c";
x.replacen("c", "d", 2");
might not do what people might think it does.
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☔ The latest upstream changes (presumably #50245) made this pull request unmergeable. Please resolve the merge conflicts. |
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let x = "a b c c";
x.replacen("c", "d", 2");
might not do what people might think it does.