error: `#[inline]` attribute cannot be used on crates
  --> $DIR/lint_on_root.rs:3:1
   |
LL | #![inline = ""]
   | ^^^^^^^^^^^^^^^
   |
   = help: `#[inline]` can only be applied to functions

error: valid forms for the attribute are `#![inline(always)]`, `#![inline(never)]`, and `#![inline]`
  --> $DIR/lint_on_root.rs:3:1
   |
LL | #![inline = ""]
   | ^^^^^^^^^^^^^^^
   |
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
   = note: `#[deny(ill_formed_attribute_input)]` (part of `#[deny(future_incompatible)]`) on by default

error: aborting due to 2 previous errors

Future incompatibility report: Future breakage diagnostic:
error: valid forms for the attribute are `#![inline(always)]`, `#![inline(never)]`, and `#![inline]`
  --> $DIR/lint_on_root.rs:3:1
   |
LL | #![inline = ""]
   | ^^^^^^^^^^^^^^^
   |
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
   = note: `#[deny(ill_formed_attribute_input)]` (part of `#[deny(future_incompatible)]`) on by default