Compiler crash when implementing a trait with unmet supertrait bound

Code

trait UnitValue: NewTrait {
    fn value(&self) -> i32;
}
impl UnitValue for i32 {
    fn value(&self) -> i32 {
        *self
    }
}
trait UnitExt: UnitValue {
    fn double_value(&self) -> i32 {
        self.value() + self.value()
    }
}
impl<T: UnitValue> UnitExt for T {}
pub fn main() {
    let _x = 42;
    let _y = test().double_value();
}
fn test() -> impl UnitValue {
    100
}
trait NewTrait<const N: usize> {}

Meta

1a91028

Error output

bug.rs:9:6: error: the trait bound ‘i32: NewTrait’ is not satisfied [E0277]
    6 | trait UnitValue: NewTrait {
      |                          required by this bound in: UnitValue
......
    9 | impl UnitValue for i32 {
      |      ^~~~~~~~~
      |               the trait NewTrait is not implemented for i32
bug.rs:19:20: error: the trait bound ‘T: NewTrait’ is not satisfied [E0277]
    6 | trait UnitValue: NewTrait {
      |                          required by this bound in: UnitValue
......
   19 | impl<T: UnitValue> UnitExt for T {}
      |                    ^~~~~~~
      |                           the trait NewTrait is not implemented for T

Segmentation fault (core dumped)