Ignore unused_macro_rules warning in test macros

Author: dtolnay

tests/ui/delimiter-span.rs

@@ -1,3 +1,5 @@
+#![allow(unused_macro_rules)]
+
 use async_trait::async_trait;
 
 macro_rules! picky {

tests/ui/delimiter-span.stderr

@@ -1,25 +1,17 @@
 error: no rules expected the token `{`
-  --> tests/ui/delimiter-span.rs:17:16
+  --> tests/ui/delimiter-span.rs:19:16
    |
-3  | macro_rules! picky {
+5  | macro_rules! picky {
    | ------------------ when calling this macro
 ...
-17 |         picky!({ 123, self });
+19 |         picky!({ 123, self });
    |                ^ no rules expected this token in macro call
 
 error: no rules expected the token `{`
-  --> tests/ui/delimiter-span.rs:18:16
+  --> tests/ui/delimiter-span.rs:20:16
    |
-3  | macro_rules! picky {
+5  | macro_rules! picky {
    | ------------------ when calling this macro
 ...
-18 |         picky!({ 123 });
+20 |         picky!({ 123 });
    |                ^ no rules expected this token in macro call
-
-warning: 1st rule of macro `picky` is never used
- --> tests/ui/delimiter-span.rs:4:5
-  |
-4 |     ($(t:tt)*) => {};
-  |     ^^^^^^^^^^
-  |
-  = note: `#[warn(unused_macro_rules)]` on by default