error: const `impl` for trait `Add` which is not marked with `#[const_trait]`
  --> $DIR/generic-bound.rs:16:15
   |
LL | impl<T> const std::ops::Add for S<T> {
   |               ^^^^^^^^^^^^^
   |
   = note: marking a trait with `#[const_trait]` ensures all default method bodies are `const`
   = note: adding a non-const method body in the future would be a breaking change

error[E0015]: cannot call non-const operator in constant functions
  --> $DIR/generic-bound.rs:25:5
   |
LL |     arg + arg
   |     ^^^^^^^^^
   |
   = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0015`.