error[E0015]: cannot call non-const operator in constant functions
  --> $DIR/issue-90870.rs:9:5
   |
LL |     a == b
   |     ^^^^^^
   |
   = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants
help: consider dereferencing here
   |
LL |     *a == *b
   |     +     +
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 constant functions
  --> $DIR/issue-90870.rs:15:5
   |
LL |     a == b
   |     ^^^^^^
   |
   = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants
help: consider dereferencing here
   |
LL |     ****a == ****b
   |     ++++     ++++
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 constant functions
  --> $DIR/issue-90870.rs:22:12
   |
LL |         if l == r {
   |            ^^^^^^
   |
   = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants
help: consider dereferencing here
   |
LL |         if *l == *r {
   |            +     +
help: add `#![feature(const_trait_impl)]` to the crate attributes to enable
   |
LL + #![feature(const_trait_impl)]
   |

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0015`.