warning: the feature `effects` is incomplete and may not be safe to use and/or cause compiler crashes
  --> $DIR/spec-effectvar-ice.rs:4:12
   |
LL | #![feature(effects)]
   |            ^^^^^^^
   |
   = note: see issue #102090 <https://github.com/rust-lang/rust/issues/102090> for more information
   = note: `#[warn(incomplete_features)]` on by default

error: using `#![feature(effects)]` without enabling next trait solver globally
   |
   = note: the next trait solver must be enabled globally for the effects feature to work correctly
   = help: use `-Znext-solver` to enable

error: const `impl` for trait `Foo` which is not marked with `#[const_trait]`
  --> $DIR/spec-effectvar-ice.rs:12:15
   |
LL | trait Foo {}
   | - help: mark `Foo` as const: `#[const_trait]`
LL |
LL | impl<T> const Foo for T {}
   |               ^^^
   |
   = note: marking a trait with `#[const_trait]` ensures all default method bodies are `const`
   = note: adding a non-const method body in the future would be a breaking change

error: const `impl` for trait `Foo` which is not marked with `#[const_trait]`
  --> $DIR/spec-effectvar-ice.rs:15:15
   |
LL | trait Foo {}
   | - help: mark `Foo` as const: `#[const_trait]`
...
LL | impl<T> const Foo for T where T: const Specialize {}
   |               ^^^
   |
   = note: marking a trait with `#[const_trait]` ensures all default method bodies are `const`
   = note: adding a non-const method body in the future would be a breaking change

error: `const` can only be applied to `#[const_trait]` traits
  --> $DIR/spec-effectvar-ice.rs:15:40
   |
LL | impl<T> const Foo for T where T: const Specialize {}
   |                                        ^^^^^^^^^^

error: specialization impl does not specialize any associated items
  --> $DIR/spec-effectvar-ice.rs:15:1
   |
LL | impl<T> const Foo for T where T: const Specialize {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
note: impl is a specialization of this impl
  --> $DIR/spec-effectvar-ice.rs:12:1
   |
LL | impl<T> const Foo for T {}
   | ^^^^^^^^^^^^^^^^^^^^^^^

error: cannot specialize on trait `Specialize`
  --> $DIR/spec-effectvar-ice.rs:15:34
   |
LL | impl<T> const Foo for T where T: const Specialize {}
   |                                  ^^^^^^^^^^^^^^^^

error: aborting due to 6 previous errors; 1 warning emitted