diff --git a/library/std/src/thread/local.rs b/library/std/src/thread/local.rs index 338567777f753..2e13f433dcffb 100644 --- a/library/std/src/thread/local.rs +++ b/library/std/src/thread/local.rs @@ -186,12 +186,12 @@ macro_rules! thread_local { // empty (base case for the recursion) () => {}; - ($(#[$attr:meta])* $vis:vis static $name:ident: $t:ty = const { $init:expr }; $($rest:tt)*) => ( + ($(#[$attr:meta])* $vis:vis static $name:ident: $t:ty = const $init:block; $($rest:tt)*) => ( $crate::thread::local_impl::thread_local_inner!($(#[$attr])* $vis $name, $t, const $init); $crate::thread_local!($($rest)*); ); - ($(#[$attr:meta])* $vis:vis static $name:ident: $t:ty = const { $init:expr }) => ( + ($(#[$attr:meta])* $vis:vis static $name:ident: $t:ty = const $init:block) => ( $crate::thread::local_impl::thread_local_inner!($(#[$attr])* $vis $name, $t, const $init); ); diff --git a/library/std/tests/thread.rs b/library/std/tests/thread.rs index 754b264c6ad93..4ce81f2846ea9 100644 --- a/library/std/tests/thread.rs +++ b/library/std/tests/thread.rs @@ -1,3 +1,4 @@ +use std::cell::{Cell, RefCell}; use std::sync::{Arc, Mutex}; use std::thread; use std::time::Duration; @@ -14,3 +15,24 @@ fn sleep() { thread::sleep(Duration::from_millis(100)); assert_eq!(*finished.lock().unwrap(), false); } + +#[test] +fn thread_local_containing_const_statements() { + // This exercises the `const $init:block` cases of the thread_local macro. + // Despite overlapping with expression syntax, the `const { ... }` is not + // parsed as `$init:expr`. + thread_local! { + static CELL: Cell = const { + let value = 1; + Cell::new(value) + }; + + static REFCELL: RefCell = const { + let value = 1; + RefCell::new(value) + }; + } + + assert_eq!(CELL.get(), 1); + assert_eq!(REFCELL.take(), 1); +}