fix #12302: internalAstError using lambda (danmar#7589)

Fixes the case `case (int)1:`.

Author: ludviggunne

lib/tokenlist.cpp

@@ -470,7 +470,7 @@ static bool iscast(const Token *tok, bool cpp)
     if (Token::Match(tok->link(), ") %assign%|,|..."))
         return false;
 
-    if (tok->previous() && tok->previous()->isName() && tok->strAt(-1) != "return" &&
+    if (tok->previous() && tok->previous()->isName() && !Token::Match(tok->previous(), "return|case") &&
         (!cpp || !Token::Match(tok->previous(), "delete|throw")))
         return false;
 
@@ -600,6 +600,10 @@ static bool iscpp11init_impl(const Token * const tok)
             if (Token::simpleMatch(castTok->astParent(), "case"))
                 return true;
         }
+        if (findParent(colonTok->previous(), [](const Token *parent){
+            return parent->str() == "case";
+        }))
+            return true;
         const Token* caseTok = colonTok->tokAt(-2);
         while (caseTok && Token::Match(caseTok->tokAt(-1), "::|%name%"))
             caseTok = caseTok->tokAt(-1);

test/testtokenize.cpp

@@ -7071,6 +7071,23 @@ class TestTokenizer : public TestFixture {
                                              "}\n"));
         ASSERT_EQUALS("", errout_str());
 
+        ASSERT_NO_THROW(tokenizeAndStringify("int foo() {\n"
+                                             "    connect([]( const int& f ) {\n"
+                                             "                switch( f )\n"
+                                             "                {\n"
+                                             "                    case (int)1:\n"
+                                             "                    {\n"
+                                             "                        A r(f);\n"
+                                             "                        if (1) {}\n"
+                                             "                    }\n"
+                                             "                    break;\n"
+                                             "                }\n"
+                                             "                return 0;\n"
+                                             "             });\n"
+                                             "    return 0;\n"
+                                             "}\n"));
+        ASSERT_EQUALS("", errout_str());
+
         // #11378
         ASSERT_EQUALS("gT{(&[{= 0return", testAst("auto g = T{ [&]() noexcept -> int { return 0; } };"));