error[E0658]: `for` is not allowed in a `const`
  --> $DIR/const-for-feature-gate.rs:4:5
   |
LL |     for _ in 0..5 {}
   |     ^^^^^^^^^^^^^^^^
   |
   = note: see issue #87575 <https://github.com/rust-lang/rust/issues/87575> for more information
   = help: add `#![feature(const_for)]` 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   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date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 1 previous error

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