Make sure that del_stmt as a name can be handled, see #313

test/completion/basic.py

@@ -203,6 +203,19 @@ if r:
     #? int()
     r
 
+# -----------------
+# del
+# -----------------
+
+deleted_var = 3
+del deleted_var
+#? int()
+deleted_var
+#? ['deleted_var']
+deleted_var
+#! ['deleted_var = 3']
+deleted_var
+
 # -----------------
 # within docstrs
 # -----------------