Rust: Add AST consistency queries

Author: hvitved

rust/ql/consistency-queries/AstConsistency.ql

@@ -0,0 +1,21 @@
+import rust
+import codeql.rust.elements.internal.generated.ParentChild
+
+query predicate multipleToString(Element e, string s) {
+  s = strictconcat(e.toString(), ",") and
+  strictcount(e.toString()) > 1
+}
+
+query predicate multipleLocations(Locatable e) { strictcount(e.getLocation()) > 1 }
+
+query predicate multiplePrimaryQlClasses(Element e, string s) {
+  s = e.getPrimaryQlClasses() and
+  strictcount(e.getAPrimaryQlClass()) > 1
+}
+
+private Element getParent(Element child) { child = getChildAndAccessor(result, _, _) }
+
+query predicate multipleParents(Element child, Element parent) {
+  parent = getParent(child) and
+  strictcount(getParent(child)) > 1
+}