assertables

Macro assert_option_none

source 
macro_rules! assert_option_none {
    ($a:expr $(,)?) => { ... };
    ($a:expr, $($message:tt)+) => { ... };
}
👎Deprecated: Please rename from assert_option_none to assert_none because more developers prefer the shorter name.
Expand description

Assert expression is None.

  • If true, return ().

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

§Examples

use assertables::*;

let a: Option<i8> = Option::None;
assert_option_none!(a);

// This will panic
let a: Option<i8> = Option::Some(1);
assert_option_none!(a);
// assertion failed: `assert_option_none!(a)`
// https://docs.rs/assertables/8.14.0/assertables/macro.assert_option_none.html
//  a label: `a`,
//  a debug: `Some(1)`

§Module macros