Macro assertables::assert_result_err

macro_rules! assert_result_err {
    ($result:expr $(,)?) => { ... };
    ($result:expr, $($message:tt)+) => { ... };
}

Assert expression.is_err() is true.

• If true, return ().

• Otherwise, call panic! with a message and the values of the expressions with their debug representations.

Examples

let a: Result<(), i8> = Result::Err(1);
assert_result_err!(a);

let a: Result<(), i8> = Result::Ok(());
assert_result_err!(a);
// assertion failed: `assert_result_err!(result)`
//   result label: `a`,
//   result debug: `Ok(())`,
//  result.is_err(): `false`

Module macros

• assert_result_err
• assert_result_err_as_result
• debug_assert_result_err