error: generic parameters may not be used in const operations --> $DIR/self-ty-in-const-1.rs:2:41 | LL | fn t1() -> [u8; std::mem::size_of::()]; | ^^^^ cannot perform const operation using `Self` | = note: type parameters may not be used in const expressions = help: add `#![feature(generic_const_exprs)]` to allow generic const expressions error: generic `Self` types are currently not permitted in anonymous constants --> $DIR/self-ty-in-const-1.rs:12:41 | LL | fn t3() -> [u8; std::mem::size_of::()] {} | ^^^^ | note: not a concrete type --> $DIR/self-ty-in-const-1.rs:11:9 | LL | impl Bar { | ^^^^^^ error: aborting due to 2 previous errors