Fixed #1580 (unnamed anonymous struct can segfault)

lib/tokenize.cpp

@@ -6925,15 +6925,23 @@ void Tokenizer::simplifyStructDecl()
                 tok = tok->next();
                 tok->insertToken(name.c_str());
             }
+
+            // unnamed anonymous struct/union so remove it
             else if (tok->next()->str() == ";")
             {
-                Token *previous = tok1->previous();
+                tok1->deleteThis();
-                previous->deleteNext();
+                if (tok1->next() == tok)
-                previous->deleteNext();
+                {
-                tok1 = previous->next();
+                    tok1->deleteThis();
-                previous = tok->previous();
+                    tok = tok1;
-                previous->deleteNext();
+                }
-                previous->deleteNext();
+                else
+                    tok1->deleteThis();
+                tok->deleteThis();
+                if (tok->next())
+                    tok->deleteThis();
+                if (!tok->next())
+                    return;
             }
 
             tok = tok1->next();

test/testsimplifytokens.cpp

@@ -4357,6 +4357,24 @@ private:
             const char expected[] = "struct ABC : public XYZ { struct Anonymous0 { } ; Anonymous0 def ; } ;";
             ASSERT_EQUALS(expected, tok(code, false));
         }
+
+        {
+            const char code[] = "struct { int x; }; int y;";
+            const char expected[] = "int x ; int y ;";
+            ASSERT_EQUALS(expected, tok(code, false));
+        }
+
+        {
+            const char code[] = "struct { int x; };";
+            const char expected[] = "int x ; ;";
+            ASSERT_EQUALS(expected, tok(code, false));
+        }
+
+        {
+            const char code[] = "struct { };";
+            const char expected[] = ";";
+            ASSERT_EQUALS(expected, tok(code, false));
+        }
     }
 };