warning: unnecessary parentheses around pattern
  --> $DIR/unused-parens-in-macro-issue-120642.rs:26:19
   |
LL |               let (_t) = 1;
   |                   ^^^^
...
LL | unused_parens!(T1, T2, T3);
   | -------------------------- in this macro invocation
   |
note: the lint level is defined here
  --> $DIR/unused-parens-in-macro-issue-120642.rs:3:9
   |
LL | #![warn(unused_parens)]
   |         ^^^^^^^^^^^^^
   = note: this warning originates in the macro `unused_parens` (in Nightly builds, run with -Z macro-backtrace for more info)

warning: unnecessary parentheses around type
  --> $DIR/unused-parens-in-macro-issue-120642.rs:23:18
   |
LL |                 <($($rest),*)>::bar()
   |                  ^^^^^^^^^^^^
...
LL | unused_parens!(T1, T2, T3);
   | -------------------------- in this macro invocation
   |
   = note: this warning originates in the macro `unused_parens` (in Nightly builds, run with -Z macro-backtrace for more info)

warning: unnecessary parentheses around pattern
  --> $DIR/unused-parens-in-macro-issue-120642.rs:26:19
   |
LL |               let (_t) = 1;
   |                   ^^^^
...
LL | unused_parens!(T1, T2, T3);
   | -------------------------- in this macro invocation
   |
   = note: this warning originates in the macro `unused_parens` (in Nightly builds, run with -Z macro-backtrace for more info)

warning: 3 warnings emitted