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| author | Mark Simulacrum <mark.simulacrum@gmail.com> | 2018-06-02 19:55:08 -0600 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2018-06-02 19:55:08 -0600 |
| commit | 5bbe1ebe00428b77708c4d29989be09963ee2880 (patch) | |
| tree | 5be90d9b1ebc170531ee1734e20b54191f7777de | |
| parent | 0c695e01dafa6046660d0e92844827d104aa4ab2 (diff) | |
| parent | 0ff8d40fa1c6be4428a65f6539ffe98c83245eab (diff) | |
| download | rust-5bbe1ebe00428b77708c4d29989be09963ee2880.tar.gz rust-5bbe1ebe00428b77708c4d29989be09963ee2880.zip | |
Rollup merge of #51306 - kennytm:impl-default-for-mut-str, r=SimonSapin
impl Default for &mut str Rationale: There is already `impl Default for &mut [T]`. Note: This impl is insta-stable.
| -rw-r--r-- | src/liballoc/tests/str.rs | 1 | ||||
| -rw-r--r-- | src/libcore/str/mod.rs | 6 |
2 files changed, 7 insertions, 0 deletions
diff --git a/src/liballoc/tests/str.rs b/src/liballoc/tests/str.rs index 03d295d16e6..75306ac82df 100644 --- a/src/liballoc/tests/str.rs +++ b/src/liballoc/tests/str.rs @@ -1326,6 +1326,7 @@ fn test_str_default() { t::<&str>(); t::<String>(); + t::<&mut str>(); } #[test] diff --git a/src/libcore/str/mod.rs b/src/libcore/str/mod.rs index 3169893fcde..5e1a9c25a21 100644 --- a/src/libcore/str/mod.rs +++ b/src/libcore/str/mod.rs @@ -3875,6 +3875,12 @@ impl<'a> Default for &'a str { fn default() -> &'a str { "" } } +#[stable(feature = "default_mut_str", since = "1.28.0")] +impl<'a> Default for &'a mut str { + /// Creates an empty mutable str + fn default() -> &'a mut str { unsafe { from_utf8_unchecked_mut(&mut []) } } +} + /// An iterator over the non-whitespace substrings of a string, /// separated by any amount of whitespace. /// |