Fix internalASTError with decltype (refs #11378) (#5553)

Author: chrchr-github

lib/tokenlist.cpp

@@ -762,6 +762,8 @@ static void compileTerm(Token *&tok, AST_state& state)
                 tok = tok->linkAt(1);
             else if (Token::Match(tok, "%name% ...") || (state.op.size() == 1 && state.depth == 0 && Token::Match(tok->tokAt(-3), "!!& ) ( %name% ) =")))
                 tok = tok->next();
+            else if (Token::simpleMatch(tok, "decltype (") && Token::simpleMatch(tok->linkAt(1), ") ::"))
+                tok = tok->linkAt(1);
             tok = tok->next();
             if (Token::Match(tok, "%str%")) {
                 while (Token::Match(tok, "%name%|%str%"))
@@ -836,7 +838,8 @@ static void compileScope(Token *&tok, AST_state& state)
             if (Token::Match(lastOp, ":: %name%"))
                 lastOp = lastOp->next();
             if (Token::Match(lastOp, "%name%") &&
-                (lastOp->next() == tok || (Token::Match(lastOp, "%name% <") && lastOp->linkAt(1) && tok == lastOp->linkAt(1)->next())))
+                (lastOp->next() == tok ||
+                 (Token::Match(lastOp, "%name% <|(") && lastOp->linkAt(1) && tok == lastOp->linkAt(1)->next())))
                 compileBinOp(tok, state, compileTerm);
             else
                 compileUnaryOp(tok, state, compileTerm);

test/testtokenize.cpp

@@ -6073,7 +6073,7 @@ class TestTokenizer : public TestFixture {
         // C++17: if (expr1; expr2)
         ASSERT_EQUALS("ifx3=y;(", testAst("if (int x=3; y)"));
 
-
+        ASSERT_EQUALS("xstdstring::decltypea::{=", testAst("auto x = std::string{ decltype(s)::a };"));
     }
 
     void astexpr2() { // limit for large expressions