std::assert_eq!
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( $ left : expr , $ right : expr ) => ( { match ( & ( $ left ) , & ( $ right ) ) { ( left_val , right_val ) => { if ! ( ( * left_val == * right_val ) && ( * right_val == * left_val ) ) { panic ! ( "assertion failed: `(left == right) && (right == left)` \ (left: `{:?}`, right: `{:?}`)" , * left_val , * right_val ) } } } } )
Asserts that two expressions are equal to each other, testing equality in both directions.
On panic, this macro will print the values of the expressions.
Example
fn main() { let a = 3; let b = 1 + 2; assert_eq!(a, b); }let a = 3; let b = 1 + 2; assert_eq!(a, b);