error[E0401]: can't use generic parameters from outer function
  --> $DIR/const-param-from-outer-fn.rs:3:9
   |
LL | fn foo<const X: u32>() {
   |              - const parameter from outer function
LL |     fn bar() -> u32 {
   |           - help: try using a local generic parameter instead: `<X>`
LL |         X
   |         ^ use of generic parameter from outer function

error: aborting due to previous error

For more information about this error, try `rustc --explain E0401`.