add test case for issue 105601

Author: chenyukang

tests/ui/lint/unused/issue-105061-array-lint.rs

@@ -0,0 +1,11 @@
+#![warn(unused)]
+#![deny(warnings)]
+
+fn main() {
+    let _x: ([u32; 3]); //~ ERROR unnecessary parentheses around type
+    let _y: [u8; (3)]; //~ ERROR unnecessary parentheses around const expression
+    let _z: ([u8; (3)]);
+    //~^ ERROR unnecessary parentheses around const expression
+    //~| ERROR unnecessary parentheses around type
+
+}

tests/ui/lint/unused/issue-105061-array-lint.stderr

@@ -0,0 +1,56 @@
+error: unnecessary parentheses around type
+  --> $DIR/issue-105061-array-lint.rs:5:13
+   |
+LL |     let _x: ([u32; 3]);
+   |             ^        ^
+   |
+note: the lint level is defined here
+  --> $DIR/issue-105061-array-lint.rs:2:9
+   |
+LL | #![deny(warnings)]
+   |         ^^^^^^^^
+   = note: `#[deny(unused_parens)]` implied by `#[deny(warnings)]`
+help: remove these parentheses
+   |
+LL -     let _x: ([u32; 3]);
+LL +     let _x: [u32; 3];
+   |
+
+error: unnecessary parentheses around const expression
+  --> $DIR/issue-105061-array-lint.rs:6:18
+   |
+LL |     let _y: [u8; (3)];
+   |                  ^ ^
+   |
+help: remove these parentheses
+   |
+LL -     let _y: [u8; (3)];
+LL +     let _y: [u8; 3];
+   |
+
+error: unnecessary parentheses around type
+  --> $DIR/issue-105061-array-lint.rs:7:13
+   |
+LL |     let _z: ([u8; (3)]);
+   |             ^         ^
+   |
+help: remove these parentheses
+   |
+LL -     let _z: ([u8; (3)]);
+LL +     let _z: [u8; (3)];
+   |
+
+error: unnecessary parentheses around const expression
+  --> $DIR/issue-105061-array-lint.rs:7:19
+   |
+LL |     let _z: ([u8; (3)]);
+   |                   ^ ^
+   |
+help: remove these parentheses
+   |
+LL -     let _z: ([u8; (3)]);
+LL +     let _z: ([u8; 3]);
+   |
+
+error: aborting due to 4 previous errors
+

tests/ui/lint/unused/issue-105061-should-lint.rs

@@ -0,0 +1,17 @@
+#![warn(unused)]
+#![deny(warnings)]
+
+struct Inv<'a>(&'a mut &'a ());
+
+trait Trait<'a> {}
+impl<'b> Trait<'b> for for<'a> fn(Inv<'a>) {}
+
+
+fn with_bound()
+where
+    for<'b> (for<'a> fn(Inv<'a>)): Trait<'b>, //~ ERROR unnecessary parentheses around type
+{}
+
+fn main() {
+    with_bound();
+}

tests/ui/lint/unused/issue-105061-should-lint.stderr

@@ -0,0 +1,20 @@
+error: unnecessary parentheses around type
+  --> $DIR/issue-105061-should-lint.rs:12:13
+   |
+LL |     for<'b> (for<'a> fn(Inv<'a>)): Trait<'b>,
+   |             ^                   ^
+   |
+note: the lint level is defined here
+  --> $DIR/issue-105061-should-lint.rs:2:9
+   |
+LL | #![deny(warnings)]
+   |         ^^^^^^^^
+   = note: `#[deny(unused_parens)]` implied by `#[deny(warnings)]`
+help: remove these parentheses
+   |
+LL -     for<'b> (for<'a> fn(Inv<'a>)): Trait<'b>,
+LL +     for<'b> for<'a> fn(Inv<'a>): Trait<'b>,
+   |
+
+error: aborting due to previous error
+