Fix internalAstError with switch/case (#4739)

Author: chrchr-github

lib/tokenlist.cpp

@@ -651,7 +651,7 @@ static bool iscpp11init_impl(const Token * const tok)
     }
 
     auto isCaseStmt = [](const Token* colonTok) {
-        if (!Token::Match(colonTok->tokAt(-1), "%name%|%num% :"))
+        if (!Token::Match(colonTok->tokAt(-1), "%name%|%num%|%char% :"))
             return false;
         const Token* caseTok = colonTok->tokAt(-2);
         while (caseTok && Token::Match(caseTok->tokAt(-1), "::|%name%"))

test/testtokenize.cpp

@@ -6558,6 +6558,17 @@ class TestTokenizer : public TestFixture {
                                              "    });\n"
                                              "}\n"));
 
+        ASSERT_NO_THROW(tokenizeAndStringify("void f(const std::vector<char>& v) {\n"
+                                             "    std::for_each(v.begin(), v.end(), [&](char c) {\n"
+                                             "        switch (c) {\n"
+                                             "            case 'r': {\n"
+                                             "                if (c) {}\n"
+                                             "            }\n"
+                                             "            break;\n"
+                                             "        }\n"
+                                             "    });\n"
+                                             "}\n"));
+
         // #11378
         ASSERT_EQUALS("gT{(&[{= 0return", testAst("auto g = T{ [&]() noexcept -> int { return 0; } };"));
     }