File: extern-prelude-extern-crate-cfg.rs

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//@ build-pass (FIXME(62277): could be check-pass?)
//@ compile-flags:--cfg my_feature --check-cfg=cfg(my_feature)

#![no_std]

#[cfg(my_feature)]
extern crate std;

mod m {
    #[cfg(my_feature)]
    fn conditional() {
        std::vec::Vec::<u8>::new(); // OK
    }
}

fn main() {}