error[E0425]: cannot find value `Foo` in this scope
  --> $DIR/layout-error.rs:24:17
   |
LL |         let a = Foo;
   |                 ^^^ not found in this scope

warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
  --> $DIR/layout-error.rs:8:32
   |
LL | #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
   |                                ^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `#[warn(incomplete_features)]` on by default
   = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information

error: aborting due to previous error; 1 warning emitted

For more information about this error, try `rustc --explain E0425`.