Swift: db upgrade/downgrade script

Author: d10c

swift/downgrades/15d0da3a76b9dbffb921ae6d585f8a8de8945a0b/iterable_decl_context_members.ql

@@ -0,0 +1,17 @@
+class IterableDeclContext extends @decl {
+  IterableDeclContext() {
+    this instanceof @extension_decl
+    or
+    this instanceof @nominal_type_decl
+  }
+
+  string toString() { none() }
+}
+
+class DeclOrNone extends @decl_or_none {
+  string toString() { none() }
+}
+
+query predicate iterable_decl_context_members(IterableDeclContext id, int index, DeclOrNone member) {
+  decl_members(id, index, member)
+}