gcc/testsuite/rust/execute/torture/trait15.rs


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/* { dg-output "parent123\r*\nchild\r*\n" } */
// Testing generics passing with supertraits

extern "C" {
    fn printf(s: *const i8, ...);
}
 
#[lang = "sized"]
pub trait Sized {}

struct Foo {
    my_int: u32,
}

trait Parent<T> {
    fn parent(&self) -> T;
}

trait Child<T> : Parent<T> {
    fn child(&self);
}

impl Parent<u32> for Foo {
    fn parent(&self) -> u32 {
        unsafe {
            let parent = "parent%i\n\0";
            let msg = parent as *const str;
            printf(msg as *const i8,self.my_int);
            return self.my_int;
        }
    }
}

impl Child<u32> for Foo {
    fn child(&self) {
        let _ = self;
        unsafe {
            let child = "child\n\0";
            let msg = child as *const str;
            printf(msg as *const i8);
        }
    }
}

pub fn main() -> i32 {
    let a = Foo{my_int: 123};
    let b: &dyn Child<u32> = &a;

    b.parent();
    b.child();

    //Silence bogus warning
    let _ = a.my_int;
    
    0
}