error: unused variable: `var`
  --> $DIR/issue-117284-arg-in-macro.rs:15:18
   |
LL |     make_var!(s, var);
   |                  ^^^
   |
help: `var` is captured in macro and introduced a unused variable
  --> $DIR/issue-117284-arg-in-macro.rs:4:13
   |
LL |         let $var = $struct.$var;
   |             ^^^^
...
LL |     make_var!(s, var);
   |     ----------------- in this macro invocation
note: the lint level is defined here
  --> $DIR/issue-117284-arg-in-macro.rs:1:9
   |
LL | #![deny(unused_variables)]
   |         ^^^^^^^^^^^^^^^^
   = note: this error originates in the macro `make_var` (in Nightly builds, run with -Z macro-backtrace for more info)

error: unused variable: `a`
  --> $DIR/issue-117284-arg-in-macro.rs:16:9
   |
LL |     let a = 1;
   |         ^ help: if this is intentional, prefix it with an underscore: `_a`

error: aborting due to 2 previous errors