error[E0658]: use of unstable library feature `type_info`
  --> $DIR/feature_gate.rs:1:5
   |
LL | use std::mem::type_info::Type;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #146922 <https://github.com/rust-lang/rust/issues/146922> for more information
   = help: add `#![feature(type_info)]` to the crate attributes to enable
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date

error[E0658]: use of unstable library feature `type_info`
  --> $DIR/feature_gate.rs:5:14
   |
LL |     let ty = std::mem::type_info::Type::of::<()>();
   |              ^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #146922 <https://github.com/rust-lang/rust/issues/146922> for more information
   = help: add `#![feature(type_info)]` to the crate attributes to enable
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date

error[E0658]: use of unstable library feature `type_info`
  --> $DIR/feature_gate.rs:5:14
   |
LL |     let ty = std::mem::type_info::Type::of::<()>();
   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #146922 <https://github.com/rust-lang/rust/issues/146922> for more information
   = help: add `#![feature(type_info)]` to the crate attributes to enable
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0658`.