ide-diagnostics:

  drop redundant lint-attribute tests for unused_must_use

  Address ChayimFriedman2 review: the four allow_*/deny_* lock-in tests
  added earlier in this PR re-test generic #[allow]/#[deny] lint-attribute
  resolution, which is already covered for lint attributes in general and
  need not be repeated per lint.  Remove them and keep the
  container-expression behavior tests that are the subject of this PR.

Signed-off-by: Onyeka Obi <softwareengineerasaservant@isurvivable.cv>

Author: MavenRain

crates/ide-diagnostics/src/handlers/unused_must_use.rs

@@ -261,63 +261,6 @@ fn main() {
       //^^^^^^^^^^ warn: unused return value that must be used
     };
 }
-"#,
-        );
-    }
-
-    #[test]
-    fn allow_attribute_on_fn_silences_lint() {
-        check_diagnostics(
-            r#"
-#[must_use]
-fn produces() -> i32 { 0 }
-#[allow(unused_must_use)]
-fn main() {
-    produces();
-}
-"#,
-        );
-    }
-
-    #[test]
-    fn allow_attribute_on_stmt_silences_lint() {
-        check_diagnostics(
-            r#"
-#[must_use]
-fn produces() -> i32 { 0 }
-fn main() {
-    #[allow(unused_must_use)]
-    produces();
-}
-"#,
-        );
-    }
-
-    #[test]
-    fn allow_unused_group_silences_lint() {
-        check_diagnostics(
-            r#"
-#[must_use]
-fn produces() -> i32 { 0 }
-#[allow(unused)]
-fn main() {
-    produces();
-}
-"#,
-        );
-    }
-
-    #[test]
-    fn deny_attribute_escalates_lint() {
-        check_diagnostics(
-            r#"
-#[must_use]
-fn produces() -> i32 { 0 }
-#[deny(unused_must_use)]
-fn main() {
-    produces();
-  //^^^^^^^^^^ error: unused return value that must be used
-}
 "#,
         );
     }