rust/tests/ui/consts/control-flow/try.rs

// The `?` operator is still not const-evaluatable because it calls `From::from` on the error
// variant.

const fn opt() -> Option<i32> {
    let x = Some(2);
    x?; //~ ERROR `?` is not allowed in a `const fn`
    None
}

fn main() {}
Reorganize, bless and add tests for const control flow This creates a new test directory, `ui/consts/control-flow` to hold tests related to control flow in a const context. It also blesses all existing tests with the new error messages, and adds new tests for the `const_if_match` feature. 2019-11-18 05:11:42 +00:00			// The `?` operator is still not const-evaluatable because it calls `From::from` on the error
			`// variant.`

			`const fn opt() -> Option<i32> {`
			`let x = Some(2);`
			x?; //~ ERROR `?` is not allowed in a `const fn`
			`None`
			`}`

			`fn main() {}`