VarId: fixed varids for 'for (auto [x,y]: xy)'

lib/tokenize.cpp

@@ -3429,6 +3429,15 @@ void Tokenizer::setVarIdPass1()
                 continue;
 
             bool decl;
+            if (isCPP() && Token::Match(tok->previous(), "for ( const| auto &|&&| [")) {
+                tok2 = Token::findsimplematch(tok, "[");
+                while (tok2 && tok2->str() != "]") {
+                    if (Token::Match(tok2, "%name% [,]]"))
+                        variableMap.addVariable(tok2->str());
+                    tok2 = tok2->next();
+                }
+                continue;
+            }
             try { /* Ticket #8151 */
                 decl = setVarIdParseDeclaration(&tok2, variableMap.map(), scopeStack.top().isExecutable, isCPP(), isC());
             } catch (const Token * errTok) {

test/testvarid.cpp

@@ -166,6 +166,8 @@ private:
         TEST_CASE(varid_trailing_return2); // #9066
         TEST_CASE(varid_parameter_pack); // #9383
 
+        TEST_CASE(varid_for_auto_cpp17);
+
         TEST_CASE(varidclass1);
         TEST_CASE(varidclass2);
         TEST_CASE(varidclass3);
@@ -2550,6 +2552,22 @@ private:
         ASSERT_EQUALS(exp1, tokenize(code1));
     }
 
+    void varid_for_auto_cpp17() {
+        const char code[] = "void f() {\n"
+                            "  for (auto [x,y,z]: xyz) {\n"
+                            "    x+y+z;\n"
+                            "  }\n"
+                            "  x+y+z;\n"
+                            "}";
+        const char exp1[] = "1: void f ( ) {\n"
+                            "2: for ( auto [ x@1 , y@2 , z@3 ] : xyz ) {\n"
+                            "3: x@1 + y@2 + z@3 ;\n"
+                            "4: }\n"
+                            "5: x + y + z ;\n"
+                            "6: }\n";
+        ASSERT_EQUALS(exp1, tokenize(code));
+    }
+
     void varidclass1() {
         const std::string actual = tokenize(
                                        "class Fred\n"