std: Enable usage of `thread_local!` through imports

The `thread_local!` macro delegated to an internal macro but it didn't
do so in a macros-and-the-module-system compatible fashion, meaning if a
`#![no_std]` crate imported `std` and tried to use `thread_local!` it
would fail due to missing a lookup of an internal macro.

This commit switches the macro to instead use `$crate` to invoke other
macros, ensuring that it'll work when `thread_local!` is imported alone.

1 files changed, 4 insertions, 4 deletions

diff --git a/src/libstd/thread/local.rs b/src/libstd/thread/local.rs
index 59f100fad1b..74bed0a64c5 100644
--- a/src/libstd/thread/local.rs
+++ b/src/libstd/thread/local.rs
@@ -145,13 +145,13 @@ macro_rules! thread_local {
 
     // process multiple declarations
     ($(#[$attr:meta])* $vis:vis static $name:ident: $t:ty = $init:expr; $($rest:tt)*) => (
-        __thread_local_inner!($(#[$attr])* $vis $name, $t, $init);
-        thread_local!($($rest)*);
+        $crate::__thread_local_inner!($(#[$attr])* $vis $name, $t, $init);
+        $crate::thread_local!($($rest)*);
     );
 
     // handle a single declaration
     ($(#[$attr:meta])* $vis:vis static $name:ident: $t:ty = $init:expr) => (
-        __thread_local_inner!($(#[$attr])* $vis $name, $t, $init);
+        $crate::__thread_local_inner!($(#[$attr])* $vis $name, $t, $init);
     );
 }
 
@@ -201,7 +201,7 @@ macro_rules! __thread_local_inner {
     };
     ($(#[$attr:meta])* $vis:vis $name:ident, $t:ty, $init:expr) => {
         $(#[$attr])* $vis const $name: $crate::thread::LocalKey<$t> =
-            __thread_local_inner!(@key $(#[$attr])* $vis $name, $t, $init);
+            $crate::__thread_local_inner!(@key $(#[$attr])* $vis $name, $t, $init);
     }
 }