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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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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/E0521.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/E0521.md')
-rw-r--r-- | compiler/rustc_error_codes/src/error_codes/E0521.md | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/compiler/rustc_error_codes/src/error_codes/E0521.md b/compiler/rustc_error_codes/src/error_codes/E0521.md new file mode 100644 index 000000000..fedf6365f --- /dev/null +++ b/compiler/rustc_error_codes/src/error_codes/E0521.md @@ -0,0 +1,28 @@ +Borrowed data escapes outside of closure. + +Erroneous code example: + +```compile_fail,E0521 +let mut list: Vec<&str> = Vec::new(); + +let _add = |el: &str| { + list.push(el); // error: `el` escapes the closure body here +}; +``` + +A type annotation of a closure parameter implies a new lifetime declaration. +Consider to drop it, the compiler is reliably able to infer them. + +``` +let mut list: Vec<&str> = Vec::new(); + +let _add = |el| { + list.push(el); +}; +``` + +See the [Closure type inference and annotation][closure-infere-annotation] and +[Lifetime elision][lifetime-elision] sections of the Book for more details. + +[closure-infere-annotation]: https://doc.rust-lang.org/book/ch13-01-closures.html#closure-type-inference-and-annotation +[lifetime-elision]: https://doc.rust-lang.org/reference/lifetime-elision.html |