rust/tests/ui/env-macro/option_env-not-defined.rs

//@ run-pass

pub fn main() {
    assert!(option_env!("__HOPEFULLY_DOESNT_EXIST__").is_none());
}
tests: Add missing run-pass annotations 2019-07-26 21:54:25 +00:00			`//@ run-pass`

Fix run-pass tests to have 'pub fn main' This is required by the check-fast target because each test is slurped up into a submodule. 2013-09-25 07:43:37 +00:00			`pub fn main() {`
Fixed option_env! type The type of the result of option_env! was not fully specified in the None case, leading to type check failures in the case where the variable was not defined (e.g. option_env!("FOO").is_none()). 2013-08-10 18:09:30 +00:00			`assert!(option_env!("__HOPEFULLY_DOESNT_EXIST__").is_none());`
env! syntax extension changes env! aborts compilation of the specified environment variable is not defined and takes an optional second argument containing a custom error message. option_env! creates an Option<&'static str> containing the value of the environment variable. There are no run-pass tests that check the behavior when the environment variable is defined since the test framework doesn't support setting environment variables at compile time as opposed to runtime. However, both env! and option_env! are used inside of rustc itself, which should act as a sufficient test. Close #2248 2013-08-07 04:50:23 +00:00			`}`