error: cannot find macro `a` in this scope
  --> $DIR/expand-full-no-resolution.rs:18:18
   |
LL |         macro_rules! _a {
   |         --------------- similarly named macro `_a` defined here
...
LL |     format_args!(a!());
   |                  ^
   |
help: a macro with a similar name exists, consider renaming `_a` into `a`
   |
LL |         macro_rules! a {
   |                      ~

error: cannot find macro `a` in this scope
  --> $DIR/expand-full-no-resolution.rs:19:10
   |
LL |         macro_rules! _a {
   |         --------------- similarly named macro `_a` defined here
...
LL |     env!(a!());
   |          ^
   |
help: a macro with a similar name exists, consider renaming `_a` into `a`
   |
LL |         macro_rules! a {
   |                      ~

error: aborting due to 2 previous errors