error[E0015]: cannot call non-const operator in constant functions --> $DIR/issue-90870.rs:8:5 | 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 | + + error[E0015]: cannot call non-const operator in constant functions --> $DIR/issue-90870.rs:14:5 | 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 | ++++ ++++ error[E0015]: cannot call non-const operator in constant functions --> $DIR/issue-90870.rs:21:12 | 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 { | + + error: aborting due to 3 previous errors For more information about this error, try `rustc --explain E0015`.