Rust: Another case worth having.

Author: geoffw0

rust/ql/test/query-tests/unusedentities/UnusedVariable.expected

@@ -16,8 +16,9 @@
 | main.rs:268:9:268:11 | Yes | Variable is not used. |
 | main.rs:269:9:269:10 | No | Variable is not used. |
 | main.rs:272:12:272:12 | j | Variable is not used. |
-| main.rs:290:25:290:25 | y | Variable is not used. |
-| main.rs:294:28:294:28 | a | Variable is not used. |
-| main.rs:298:9:298:9 | p | Variable is not used. |
-| main.rs:305:13:305:13 | y | Variable is not used. |
-| main.rs:313:21:313:21 | y | Variable is not used. |
+| main.rs:282:12:282:14 | Yes | Variable is not used. |
+| main.rs:294:25:294:25 | y | Variable is not used. |
+| main.rs:298:28:298:28 | a | Variable is not used. |
+| main.rs:302:9:302:9 | p | Variable is not used. |
+| main.rs:309:13:309:13 | y | Variable is not used. |
+| main.rs:317:21:317:21 | y | Variable is not used. |

rust/ql/test/query-tests/unusedentities/main.rs

@@ -278,6 +278,10 @@ fn if_lets_matches() {
         }
     }
 
+    let l = Yes;
+    if let Yes = l { // SPURIOUS: unused variable 'Yes'
+    }
+
     match 1 {
         1 => {}
         _ => {}