diff options
| -rw-r--r-- | src/libcore/macros.rs | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/src/libcore/macros.rs b/src/libcore/macros.rs index 2eb506cedd4..b9b235969da 100644 --- a/src/libcore/macros.rs +++ b/src/libcore/macros.rs @@ -46,9 +46,12 @@ macro_rules! assert_eq { match (&$left, &$right) { (left_val, right_val) => { if !(*left_val == *right_val) { + // The reborrows below are intentional. Without them, the stack slot for the + // borrow is initialized even before the values are compared, leading to a + // noticeable slow down. panic!(r#"assertion failed: `(left == right)` left: `{:?}`, - right: `{:?}`"#, left_val, right_val) + right: `{:?}`"#, &*left_val, &*right_val) } } } @@ -60,9 +63,12 @@ macro_rules! assert_eq { match (&($left), &($right)) { (left_val, right_val) => { if !(*left_val == *right_val) { + // The reborrows below are intentional. Without them, the stack slot for the + // borrow is initialized even before the values are compared, leading to a + // noticeable slow down. panic!(r#"assertion failed: `(left == right)` left: `{:?}`, - right: `{:?}`: {}"#, left_val, right_val, + right: `{:?}`: {}"#, &*left_val, &*right_val, format_args!($($arg)+)) } } @@ -97,9 +103,12 @@ macro_rules! assert_ne { match (&$left, &$right) { (left_val, right_val) => { if *left_val == *right_val { + // The reborrows below are intentional. Without them, the stack slot for the + // borrow is initialized even before the values are compared, leading to a + // noticeable slow down. panic!(r#"assertion failed: `(left != right)` left: `{:?}`, - right: `{:?}`"#, left_val, right_val) + right: `{:?}`"#, &*left_val, &*right_val) } } } @@ -111,9 +120,12 @@ macro_rules! assert_ne { match (&($left), &($right)) { (left_val, right_val) => { if *left_val == *right_val { + // The reborrows below are intentional. Without them, the stack slot for the + // borrow is initialized even before the values are compared, leading to a + // noticeable slow down. panic!(r#"assertion failed: `(left != right)` left: `{:?}`, - right: `{:?}`: {}"#, left_val, right_val, + right: `{:?}`: {}"#, &*left_val, &*right_val, format_args!($($arg)+)) } } |