error: arguments to macro_use are not allowed here
  --> $DIR/issue-43106-gating-of-macro_use.rs:16:1
   |
LL | #![macro_use                  = "4900"] //~ ERROR arguments to macro_use are not allowed here
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: arguments to macro_use are not allowed here
  --> $DIR/issue-43106-gating-of-macro_use.rs:18:1
   |
LL | #[macro_use = "2700"]
   | ^^^^^^^^^^^^^^^^^^^^^

error: arguments to macro_use are not allowed here
  --> $DIR/issue-43106-gating-of-macro_use.rs:21:17
   |
LL |     mod inner { #![macro_use="2700"] }
   |                 ^^^^^^^^^^^^^^^^^^^^

error: aborting due to 3 previous errors