Add several lints into `unused` lint group

Remove a couple of obsolete lints

4 files changed, 10 insertions, 4 deletions

diff --git a/src/test/ui/lint/suggestions.rs b/src/test/ui/lint/suggestions.rs
index e078056ab5e..bf2b5769bf8 100644
--- a/src/test/ui/lint/suggestions.rs
+++ b/src/test/ui/lint/suggestions.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![warn(unused_mut)] // UI tests pass `-A unused`—see Issue #43896
+#![warn(unused_mut, unused_parens)] // UI tests pass `-A unused`—see Issue #43896
 #![feature(no_debug)]
 
 #[no_mangle] static SHENZHOU: usize = 1; // should suggest `pub`
diff --git a/src/test/ui/lint/suggestions.stderr b/src/test/ui/lint/suggestions.stderr
index 7a498b56413..a0014666836 100644
--- a/src/test/ui/lint/suggestions.stderr
+++ b/src/test/ui/lint/suggestions.stderr
@@ -4,7 +4,11 @@ warning: unnecessary parentheses around assigned value
 30 |         let mut a = (1); // should suggest no `mut`, no parens
    |                     ^^^ help: remove these parentheses
    |
-   = note: #[warn(unused_parens)] on by default
+note: lint level defined here
+  --> $DIR/suggestions.rs:11:21
+   |
+11 | #![warn(unused_mut, unused_parens)] // UI tests pass `-A unused`—see Issue #43896
+   |                     ^^^^^^^^^^^^^
 
 warning: use of deprecated attribute `no_debug`: the `#[no_debug]` attribute was an experimental feature that has been deprecated due to lack of demand. See https://github.com/rust-lang/rust/issues/29721
   --> $DIR/suggestions.rs:27:1
@@ -25,7 +29,7 @@ warning: variable does not need to be mutable
 note: lint level defined here
   --> $DIR/suggestions.rs:11:9
    |
-11 | #![warn(unused_mut)] // UI tests pass `-A unused`—see Issue #43896
+11 | #![warn(unused_mut, unused_parens)] // UI tests pass `-A unused`—see Issue #43896
    |         ^^^^^^^^^^
 
 warning: static is marked #[no_mangle], but not exported
diff --git a/src/test/ui/lint/unused_parens_json_suggestion.rs b/src/test/ui/lint/unused_parens_json_suggestion.rs
index 9decb0cff36..15251795d5e 100644
--- a/src/test/ui/lint/unused_parens_json_suggestion.rs
+++ b/src/test/ui/lint/unused_parens_json_suggestion.rs
@@ -16,6 +16,8 @@
 // stripping away any starting or ending parenthesis characters—hence this
 // test of the JSON error format.
 
+#![warn(unused_parens)]
+
 fn main() {
     // We want to suggest the properly-balanced expression `1 / (2 + 3)`, not
     // the malformed `1 / (2 + 3`
diff --git a/src/test/ui/lint/unused_parens_json_suggestion.stderr b/src/test/ui/lint/unused_parens_json_suggestion.stderr
index 701334d8890..ae5b53da175 100644
--- a/src/test/ui/lint/unused_parens_json_suggestion.stderr
+++ b/src/test/ui/lint/unused_parens_json_suggestion.stderr
@@ -1 +1 @@
-{"message":"unnecessary parentheses around assigned value","code":null,"level":"warning","spans":[{"file_name":"$DIR/unused_parens_json_suggestion.rs","byte_start":976,"byte_end":989,"line_start":22,"line_end":22,"column_start":14,"column_end":27,"is_primary":true,"text":[{"text":"    let _a = (1 / (2 + 3));","highlight_start":14,"highlight_end":27}],"label":null,"suggested_replacement":null,"expansion":null}],"children":[{"message":"#[warn(unused_parens)] on by default","code":null,"level":"note","spans":[],"children":[],"rendered":null},{"message":"remove these parentheses","code":null,"level":"help","spans":[{"file_name":"$DIR/unused_parens_json_suggestion.rs","byte_start":976,"byte_end":989,"line_start":22,"line_end":22,"column_start":14,"column_end":27,"is_primary":true,"text":[{"text":"    let _a = (1 / (2 + 3));","highlight_start":14,"highlight_end":27}],"label":null,"suggested_replacement":"1 / (2 + 3)","expansion":null}],"children":[],"rendered":null}],"rendered":null}
+{"message":"unnecessary parentheses around assigned value","code":null,"level":"warning","spans":[{"file_name":"$DIR/unused_parens_json_suggestion.rs","byte_start":1001,"byte_end":1014,"line_start":24,"line_end":24,"column_start":14,"column_end":27,"is_primary":true,"text":[{"text":"    let _a = (1 / (2 + 3));","highlight_start":14,"highlight_end":27}],"label":null,"suggested_replacement":null,"expansion":null}],"children":[{"message":"lint level defined here","code":null,"level":"note","spans":[{"file_name":"$DIR/unused_parens_json_suggestion.rs","byte_start":847,"byte_end":860,"line_start":19,"line_end":19,"column_start":9,"column_end":22,"is_primary":true,"text":[{"text":"#![warn(unused_parens)]","highlight_start":9,"highlight_end":22}],"label":null,"suggested_replacement":null,"expansion":null}],"children":[],"rendered":null},{"message":"remove these parentheses","code":null,"level":"help","spans":[{"file_name":"$DIR/unused_parens_json_suggestion.rs","byte_start":1001,"byte_end":1014,"line_start":24,"line_end":24,"column_start":14,"column_end":27,"is_primary":true,"text":[{"text":"    let _a = (1 / (2 + 3));","highlight_start":14,"highlight_end":27}],"label":null,"suggested_replacement":"1 / (2 + 3)","expansion":null}],"children":[],"rendered":null}],"rendered":null}