diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /compiler/rustc_error_codes/src/error_codes/E0121.md | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'compiler/rustc_error_codes/src/error_codes/E0121.md')
-rw-r--r-- | compiler/rustc_error_codes/src/error_codes/E0121.md | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/compiler/rustc_error_codes/src/error_codes/E0121.md b/compiler/rustc_error_codes/src/error_codes/E0121.md new file mode 100644 index 000000000..06fe396d5 --- /dev/null +++ b/compiler/rustc_error_codes/src/error_codes/E0121.md @@ -0,0 +1,24 @@ +The type placeholder `_` was used within a type on an item's signature. + +Erroneous code example: + +```compile_fail,E0121 +fn foo() -> _ { 5 } // error + +static BAR: _ = "test"; // error +``` + +In those cases, you need to provide the type explicitly: + +``` +fn foo() -> i32 { 5 } // ok! + +static BAR: &str = "test"; // ok! +``` + +The type placeholder `_` can be used outside item's signature as follows: + +``` +let x = "a4a".split('4') + .collect::<Vec<_>>(); // No need to precise the Vec's generic type. +``` |