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| author | Trevor Gross <tmgross@umich.edu> | 2025-06-19 06:12:28 +0000 |
|---|---|---|
| committer | Trevor Gross <tmgross@umich.edu> | 2025-06-24 11:07:16 +0000 |
| commit | 0e4de4ceb0086b7befab6736e45ac3efbc560cea (patch) | |
| tree | c8a821b0095be52479016b0827422d6462048a03 /library/std/src/lib.rs | |
| parent | c978c8986f700bc8fa83b5f98cc96f41772fa281 (diff) | |
| download | rust-0e4de4ceb0086b7befab6736e45ac3efbc560cea.tar.gz rust-0e4de4ceb0086b7befab6736e45ac3efbc560cea.zip | |
Remove the deprecated `concat_idents!` macro
In [137653], the lang and libs-API teams did a joint FCP to deprecate
and eventually remove the long-unstable `concat_idents!` macro. The
deprecation is landing in 1.88, so do the removal here (target version
1.90).
This macro has been superseded by the more recent `${concat(...)}`
metavariable expression language feature, which avoids some of the
limitations of `concat_idents!`. The metavar expression is unstably
available under the [`macro_metavar_expr_concat`] feature.
History is mildly interesting here: `concat_idents!` goes back to 2011
when it was introduced with 513276e595f8 ("Add #concat_idents[] and
about the same:
let asdf_fdsa = "<.<";
assert(#concat_idents[asd,f_f,dsa] == "<.<");
assert(#ident_to_str[use_mention_distinction]
== "use_mention_distinction");
(That test existed from introduction until its removal here.)
Closes: https://www.github.com/rust-lang/rust/issues/29599
[137653]: https://www.github.com/rust-lang/rust/pull/137653
[`macro_metavar_expr_concat`]: https://www.github.com/rust-lang/rust/issues/124225
Diffstat (limited to 'library/std/src/lib.rs')
| -rw-r--r-- | library/std/src/lib.rs | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/library/std/src/lib.rs b/library/std/src/lib.rs index 2bb7a63772d..13fb08a9210 100644 --- a/library/std/src/lib.rs +++ b/library/std/src/lib.rs @@ -281,7 +281,6 @@ #![feature(cfg_target_thread_local)] #![feature(cfi_encoding)] #![feature(char_max_len)] -#![feature(concat_idents)] #![feature(core_float_math)] #![feature(decl_macro)] #![feature(deprecated_suggestion)] @@ -717,10 +716,9 @@ pub use core::primitive; pub use core::todo; // Re-export built-in macros defined through core. #[stable(feature = "builtin_macro_prelude", since = "1.38.0")] -#[allow(deprecated)] pub use core::{ - assert, assert_matches, cfg, column, compile_error, concat, concat_idents, const_format_args, - env, file, format_args, format_args_nl, include, include_bytes, include_str, line, log_syntax, + assert, assert_matches, cfg, column, compile_error, concat, const_format_args, env, file, + format_args, format_args_nl, include, include_bytes, include_str, line, log_syntax, module_path, option_env, stringify, trace_macros, }; // Re-export macros defined in core. |