warning: the feature `effects` is incomplete and may not be safe to use and/or cause compiler crashes
  --> $DIR/const-default-impl-non-const-specialized-impl.rs:3:30
   |
LL | #![feature(const_trait_impl, effects)]
   |                              ^^^^^^^
   |
   = note: see issue #102090 <https://github.com/rust-lang/rust/issues/102090> for more information
   = note: `#[warn(incomplete_features)]` on by default

error: cannot specialize on const impl with non-const impl
  --> $DIR/const-default-impl-non-const-specialized-impl.rs:19:1
   |
LL | impl Value for FortyTwo {
   | ^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 1 previous error; 1 warning emitted