mark std::str::replace(,n) as #[must_use] #50177
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src/liballoc/str.rs
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| @@ -247,6 +247,7 @@ impl str { | |||
| /// assert_eq!(s, s.replacen("cookie monster", "little lamb", 10)); | |||
| /// ``` | |||
| #[stable(feature = "str_replacen", since = "1.16.0")] | |||
| #[must_use] | |||
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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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Apr 23, 2018
src/liballoc/str.rs
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| @@ -37,6 +37,7 @@ | |||
| // Many of the usings in this module are only used in the test configuration. | |||
| // It's cleaner to just turn off the unused_imports warning than to fix them. | |||
| #![allow(unused_imports)] | |||
| #![feature(fn_must_use)] | |||
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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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…_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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let x = "a b c c";
x.replacen("c", "d", 2");
might not do what people might think it does.