src/test/ui/resolve/resolve-primitive-fallback.rs

fn main() {
    // Make sure primitive type fallback doesn't work in value namespace
    std::mem::size_of(u16);
    //~^ ERROR expected value, found builtin type `u16`
    //~| ERROR this function takes 0 parameters but 1 parameter was supplied

    // Make sure primitive type fallback doesn't work with global paths
    let _: ::u8;
    //~^ ERROR cannot find type `u8` in the crate root
}