error[E0600]: cannot apply unary operator `!` to type `BytePos` --> $DIR/issue-14091-2.rs:15:5 | LL | assert!(x, x); | ^^^^^^^^^^^^^ cannot apply unary operator `!` | note: an implementation of `Not` might be missing for `BytePos` --> $DIR/issue-14091-2.rs:6:1 | LL | pub struct BytePos(pub u32); | ^^^^^^^^^^^^^^^^^^ must implement `Not` note: the trait `Not` must be implemented --> $SRC_DIR/core/src/ops/bit.rs:LL:COL = note: this error originates in the macro `assert` (in Nightly builds, run with -Z macro-backtrace for more info) error: aborting due to previous error For more information about this error, try `rustc --explain E0600`.