Macro matches::debug_assert_matches
source · [−]macro_rules! debug_assert_matches {
($expression:expr, $($pattern:tt)+) => { ... };
}
Expand description
Assert that an expression matches a refutable pattern using debug assertions.
Syntax: debug_assert_matches!(
expression ,
pattern )
If debug assertions are enabled, panic with a message that shows the expression if it does not match the pattern.
When debug assertions are not enabled, this macro does nothing.
Examples
#[macro_use]
extern crate matches;
fn main() {
let data = [1, 2, 3];
debug_assert_matches!(data.get(1), Some(_));
}