error[E0119]: conflicting implementations of trait `Send` for type `MyStruct` --> $DIR/overlap-not-permitted-for-builtin-trait.rs:7:1 | LL | impl !Send for MyStruct {} | ----------------------- first implementation here LL | impl !Send for MyStruct {} | ^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `MyStruct` error: aborting due to previous error For more information about this error, try `rustc --explain E0119`.