Bad trait suggestion of rustc 1.47.0

main.rs

#[derive(Debug)]
#[derive(Copy, Clone)]
pub struct Vec3<T> {
	pub x: T,
	pub y: T,
	pub z: T
}

impl<T> Vec3<T> {
	pub fn new(x:T, y:T, z:T) -> Vec3<T> {
		Vec3 { x: x, y: y, z: z }
	}
}

impl <T: std::ops::Add<Output = T> + Copy> std::ops::Add<Vec3<T>> for Vec3<T> {
	type Output = Vec3<T>;
	fn add(self, rhs:Vec3<T>) -> Self::Output {
		Vec3 { x: self.x + rhs.x, y: self.y + rhs.y, z: self.z + rhs.z }
	}
}

impl <T: std::ops::Mul<Output = T> + Copy> std::ops::Mul<T> for Vec3<T> {
	type Output = Vec3<T>;
	fn mul(self, rhs:T) -> Self::Output {
		Vec3 { x: self.x * rhs, y: self.y * rhs, z: self.z * rhs }
	}
}

pub fn travel <T: std::ops::Mul<Output = T>> (dir:Vec3<T>, t:T) -> Vec3<T> {
	dir * t
}

fn main() {
	println!("{:?}", travel(Vec3::new(1., 2., 3.), 15.));
}

/*
error[E0369]: cannot multiply `T` to `Vec3<T>`
  --> src/main.rs:30:6
   |
30 |     dir * t
   |     --- ^ - T
   |     |
   |     Vec3<T>
   |
help: consider further restricting this bound
   |
29 | pub fn travel <T: std::ops::Mul<Output = T> + std::ops::Mul<Output = T>> (dir:Vec3<T>, t:T) -> Vec3<T> {
   |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^
*/