error[E0117]: only traits defined in the current crate can be implemented for primitive types --> $DIR/const-and-non-const-impl.rs:5:1 | LL | impl const std::ops::Add for i32 { | ^^^^^^^^^^^-------------^^^^^--- | | | | | | | `i32` is not defined in the current crate | | `i32` is not defined in the current crate | impl doesn't use only types from inside the current crate | = note: define and implement a trait or new type instead error[E0119]: conflicting implementations of trait `std::ops::Add` for type `Int` --> $DIR/const-and-non-const-impl.rs:22:1 | LL | impl std::ops::Add for Int { | -------------------------- first implementation here ... LL | impl const std::ops::Add for Int { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `Int` error: aborting due to 2 previous errors Some errors have detailed explanations: E0117, E0119. For more information about an error, try `rustc --explain E0117`.