Rust: Make the placeholder queries produce no results, to avoid confusion.

Author: geoffw0

rust/ql/src/queries/unusedentities/UnusedValue.ql

@@ -3,9 +3,13 @@
  * @description Unused values may be an indication that the code is incomplete or has a typo.
  * @kind problem
  * @problem.severity recommendation
- * @precision high
+ * @precision medium
  * @id rust/unused-value
  * @tags maintainability
  */
 
-select 1, "Variable is assigned a value that is never used."
+import rust
+
+from Locatable e
+where none() // TODO: implement query
+select e, "Variable is assigned a value that is never used."

rust/ql/src/queries/unusedentities/UnusedVariable.ql

@@ -3,9 +3,13 @@
  * @description Unused variables may be an indication that the code is incomplete or has a typo.
  * @kind problem
  * @problem.severity recommendation
- * @precision high
+ * @precision medium
  * @id rust/unused-variable
  * @tags maintainability
  */
 
-select 1, "Variable is not used."
+import rust
+
+from Locatable e
+where none() // TODO: implement query
+select e, "Variable is not used."

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

@@ -1 +0,0 @@
-| 1 | Variable is assigned a value that is never used. |

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

@@ -1 +0,0 @@
-| 1 | Variable is not used. |