Fix unit test failure (#4218)

Author: pfultz2

lib/forwardanalyzer.cpp

@@ -575,7 +575,8 @@ struct ForwardTraversal {
                 tok = nextAfterAstRightmostLeaf(assignTok);
                 if (!tok)
                     return Break();
-            } else if (Token::simpleMatch(tok, ") {") && Token::Match(tok->link()->previous(), "for|while (")) {
+            } else if (Token::simpleMatch(tok, ") {") && Token::Match(tok->link()->previous(), "for|while (") &&
+                       !Token::simpleMatch(tok->link()->astOperand2(), ":")) {
                 // In the middle of a loop structure so bail
                 return Break(Analyzer::Terminate::Bail);
             } else if (tok->str() == ";" && tok->astParent()) {