#[lang = "sized"] pub trait Sized {} mod core { mod ops { #[lang = "add"] pub trait Add { type Output; fn add(self, rhs: Rhs) -> Self::Output; } } } impl core::ops::Add for f32 { type Output = f32; fn add(self, rhs: Self) -> Self::Output { self + rhs } } pub fn foo>(a: T) -> i32 { a + a } pub fn main() { foo(123f32); // { dg-error "type mismatch, expected .i32. but got .f32." "" { target *-*-* } .-1 } // { dg-error "bounds not satisfied for f32 .Add. is not satisfied" "" { target *-*-* } .-2 } }