tests/mir-opt/inline/polymorphic_recursion.rs

// skip-filecheck
// Make sure that the MIR inliner does not loop indefinitely on polymorphic recursion.
//@ compile-flags: --crate-type lib

// Randomize `def_path_hash` by defining them under a module with different names
macro_rules! emit {
    ($($m:ident)*) => {$(
        pub mod $m {
            pub trait Tr { type Next: Tr; }

            pub fn hoge<const N: usize, T: Tr>() {
                inner::<N, T>();
            }

            #[inline(always)]
            fn inner<const N: usize, T: Tr>()
            {
                inner::<N, T::Next>();
                inner::<N, T::Next>();
            }
        }
    )*};
}

// Increase the chance of triggering the bug
emit!(m00 m01 m02 m03 m04 m05 m06 m07 m08 m09 m10 m11 m12 m13 m14 m15 m16 m17 m18 m19);