error[E0412]: cannot find type `PhantomData` in this scope --> $DIR/issue-77919.rs:9:9 | LL | _n: PhantomData, | ^^^^^^^^^^^ not found in this scope | help: consider importing this struct | LL | use std::marker::PhantomData; | error[E0412]: cannot find type `VAL` in this scope --> $DIR/issue-77919.rs:11:63 | LL | impl TypeVal for Multiply where N: TypeVal {} | ^^^ not found in this scope | help: you might be missing a type parameter | LL | impl TypeVal for Multiply where N: TypeVal {} | +++++ error[E0046]: not all trait items implemented, missing: `VAL` --> $DIR/issue-77919.rs:11:1 | LL | const VAL: T; | ------------ `VAL` from trait ... LL | impl TypeVal for Multiply where N: TypeVal {} | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `VAL` in implementation error: aborting due to 3 previous errors Some errors have detailed explanations: E0046, E0412. For more information about an error, try `rustc --explain E0046`.