error[E0658]: macro invocations in `extern {}` blocks are experimental (see issue #49476)
  --> $DIR/feature-gate-macros_in_extern.rs:29:5
   |
LL |     returns_isize!(rust_get_test_int);
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: add #![feature(macros_in_extern)] to the crate attributes to enable

error[E0658]: macro invocations in `extern {}` blocks are experimental (see issue #49476)
  --> $DIR/feature-gate-macros_in_extern.rs:31:5
   |
LL |     takes_u32_returns_u32!(rust_dbg_extern_identity_u32);
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: add #![feature(macros_in_extern)] to the crate attributes to enable

error[E0658]: macro invocations in `extern {}` blocks are experimental (see issue #49476)
  --> $DIR/feature-gate-macros_in_extern.rs:33:5
   |
LL |     emits_nothing!();
   |     ^^^^^^^^^^^^^^^^^
   |
   = help: add #![feature(macros_in_extern)] to the crate attributes to enable

error: aborting due to 3 previous errors

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