rust/tests/run-make/coverage/lib/doctest_crate.rs

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/// A function run only from within doctests
pub fn fn_run_in_doctests(conditional: usize) {
match conditional {
1 => assert_eq!(1, 1), // this is run,
2 => assert_eq!(1, 1), // this,
3 => assert_eq!(1, 1), // and this too
_ => assert_eq!(1, 2), // however this is not
}
}