error: overly complex generic constant --> $DIR/issue-90318.rs:14:8 | LL | If<{ TypeId::of::() != TypeId::of::<()>() }>: True, | ^^-----------------^^^^^^^^^^^^^^^^^^^^^^^^ | | | borrowing is not supported in generic constants | = help: consider moving this anonymous constant into a `const` function = note: this operation may be supported in the future error: overly complex generic constant --> $DIR/issue-90318.rs:22:8 | LL | If<{ TypeId::of::() != TypeId::of::<()>() }>: True, | ^^-----------------^^^^^^^^^^^^^^^^^^^^^^^^ | | | borrowing is not supported in generic constants | = help: consider moving this anonymous constant into a `const` function = note: this operation may be supported in the future error[E0015]: cannot call non-const operator in constants --> $DIR/issue-90318.rs:14:10 | LL | If<{ TypeId::of::() != TypeId::of::<()>() }>: True, | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | note: impl defined here, but it is not `const` --> $SRC_DIR/core/src/any.rs:LL:COL = note: calls in constants are limited to constant functions, tuple structs and tuple variants help: add `#![feature(const_trait_impl)]` to the crate attributes to enable | LL + #![feature(const_trait_impl)] | error[E0015]: cannot call non-const operator in constants --> $DIR/issue-90318.rs:22:10 | LL | If<{ TypeId::of::() != TypeId::of::<()>() }>: True, | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | note: impl defined here, but it is not `const` --> $SRC_DIR/core/src/any.rs:LL:COL = note: calls in constants are limited to constant functions, tuple structs and tuple variants help: add `#![feature(const_trait_impl)]` to the crate attributes to enable | LL + #![feature(const_trait_impl)] | error: aborting due to 4 previous errors For more information about this error, try `rustc --explain E0015`.