Make the del statement work inside functions

src/analysis/scoping_analysis.cpp

@@ -210,6 +210,13 @@ public:
     virtual bool visit_jump(AST_Jump* node) { return false; }
 
 
+    virtual bool visit_delete(AST_Delete* node) {
+        for (auto t : node->targets) {
+            RELEASE_ASSERT(t->type != AST_TYPE::Name, "");
+        }
+        return false;
+    }
+
     virtual bool visit_global(AST_Global* node) {
         for (int i = 0; i < node->names.size(); i++) {
             const std::string& name = node->names[i];

test/tests/delitem.py

@@ -15,3 +15,12 @@ del a[:]
 print a
 a.append(1)
 print a
+
+# Make sure that del's work correctly in sub-scopes:
+x = 1
+def f1():
+    x = range(5)
+    def f2():
+        del x[1]
+    return f2
+f1()()