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Allow any `const` expression blocks in `thread_local!` This PR contains a rebase of the macro change from #116392, together with adding a test under library/std/tests. Testing this feature by making the documentation's example code needlessly more complicated was not appropriate as pointed out in https://github.com/rust-lang/rust/pull/116392#pullrequestreview-1753097757. Without the macro change, this new test would fail to build as follows: ```console error: no rules expected the token `let` --> library/std/tests/thread.rs:26:13 | 26 | let value = 1; | ^^^ no rules expected this token in macro call | note: while trying to match meta-variable `$init:expr` --> library/std/src/thread/local.rs:189:69 | 189 | ($(#[$attr:meta])* $vis:vis static $name:ident: $t:ty = const { $init:expr }; $($rest:tt)*) => ( | ^^^^^^^^^^ ``` Closes #116392. |
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