Fix #13742 FP syntaxError for function-level try block in const member function (#7413)

Author: chrchr-github

lib/tokenize.cpp

@@ -8983,7 +8983,10 @@ void Tokenizer::simplifyFunctionTryCatch()
     for (Token * tok = list.front(); tok; tok = tok->next()) {
         if (!Token::Match(tok, "try {|:"))
             continue;
-        if (!TokenList::isFunctionHead(tok->previous(), "try")) // TODO: this is supposed to a list of characters and not strings
+        const Token* par = tok->previous();
+        while (par && par->isKeyword())
+            par = par->previous();
+        if (!TokenList::isFunctionHead(par, "try")) // TODO: this is supposed to a list of characters and not strings
             continue;
 
         Token* tryStartToken = skipInitializerList(tok->next());

test/testtokenize.cpp

@@ -1817,6 +1817,15 @@ class TestTokenizer : public TestFixture {
                                            "  };\n"
                                            "} catch (long) {\n"
                                            "}"));
+
+        ASSERT_EQUALS("struct S { void func ( ) const ; } ;\n"
+                      "void S :: func ( ) const {\n"
+                      "try { f ( ) ; }\n"
+                      "catch ( ... ) { g ( ) ; } }",
+                      tokenizeAndStringify("struct S { void func() const; };\n"
+                                           "void S::func() const\n"
+                                           "try { f(); }\n"
+                                           "catch (...) { g(); }\n"));
     }
 
     // Simplify "((..))" into "(..)"