Fix #14809 FP syntaxError for typedef involving std::size_t (#8618)

`size_t` is a platform type and will be simplified anyway, this is
tested here:
https://github.com/cppcheck-opensource/cppcheck/blob/e1053dba3b0988dc828d7a9c4b2a8f6c9866035b/test/testtokenize.cpp#L9012

---------

Co-authored-by: chrchr-github <noreply@github.com>

Author: chrchr-github

lib/token.cpp

@@ -204,7 +204,6 @@ static const std::unordered_set<std::string> stdTypes = { "bool"
                                                           , "int"
                                                           , "long"
                                                           , "short"
-                                                          , "size_t"
                                                           , "void"
                                                           , "wchar_t"
                                                           , "signed"

test/testtoken.cpp

@@ -1059,7 +1059,6 @@ class TestToken : public TestFixture {
         standard_types.emplace_back("long");
         standard_types.emplace_back("float");
         standard_types.emplace_back("double");
-        standard_types.emplace_back("size_t");
 
         for (auto test_op = standard_types.cbegin(); test_op != standard_types.cend(); ++test_op) {
             auto tokensFrontBack = std::make_shared<TokensFrontBack>();
@@ -1484,13 +1483,6 @@ class TestToken : public TestFixture {
             tok.str("char"); // not treated as keyword in TokenList::isKeyword()
             assert_tok(&tok, Token::Type::eType, /*l=*/ false, /*std=*/ true);
         }
-        {
-            TokenList list_c{settingsDefault, Standards::Language::C};
-            auto tokensFrontBack = std::make_shared<TokensFrontBack>();
-            Token tok(list_c, std::move(tokensFrontBack));
-            tok.str("size_t"); // not treated as keyword in TokenList::isKeyword()
-            assert_tok(&tok, Token::Type::eType, /*l=*/ false, /*std=*/ true);
-        }
     }
 
     void update_property_info_etype_cpp() const
@@ -1502,21 +1494,12 @@ class TestToken : public TestFixture {
             tok.str("bool"); // not treated as keyword in TokenList::isKeyword()
             assert_tok(&tok, Token::Type::eType, /*l=*/ false, /*std=*/ true);
         }
-        {
-            TokenList list_cpp{settingsDefault, Standards::Language::CPP};
-            auto tokensFrontBack = std::make_shared<TokensFrontBack>();
-            Token tok(list_cpp, std::move(tokensFrontBack));
-            tok.str("size_t");
-            assert_tok(&tok, Token::Type::eType, /*l=*/ false, /*std=*/ true);
-        }
     }
 
     void update_property_info_replace() const // #13743
     {
         auto tokensFrontBack = std::make_shared<TokensFrontBack>();
         Token tok(list, std::move(tokensFrontBack));
-        tok.str("size_t");
-        assert_tok(&tok, Token::Type::eType, false, true);
         tok.str("long");
         assert_tok(&tok, Token::Type::eType, false, true);
     }

test/testtokenize.cpp

@@ -7893,6 +7893,8 @@ class TestTokenizer : public TestFixture {
                                              "}\n"));
 
         ignore_errout();
+
+        ASSERT_EQUALS(";", tokenizeAndStringify("typedef std::size_t size_t;\n")); // #14809
     }
 
 

test/testvarid.cpp

@@ -2841,7 +2841,7 @@ class TestVarID : public TestFixture {
     void varid_using() {
         // #3648
         const char code[] = "using std::size_t;";
-        const char expected[] = "1: using unsigned long ;\n";
+        const char expected[] = "1: ;\n";
         ASSERT_EQUALS(expected, tokenize(code));
     }