rust/src/test/rustdoc-ui/cfg-test.rs

// compile-pass
// compile-flags:--test
// normalize-stdout-test: "src/test/rustdoc-ui" -> "$$DIR"

// Crates like core have doctests gated on `cfg(not(test))` so we need to make
// sure `cfg(test)` is not active when running `rustdoc --test`.

/// this doctest will be ignored:
///
/// ```
/// assert!(false);
/// ```
#[cfg(test)]
pub struct Foo;

/// this doctest will be tested:
///
/// ```
/// assert!(true);
/// ```
#[cfg(not(test))]
pub struct Foo;