Fix #11861 Syntax Error: AST broken for C++20 ranges (#8644)

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

Author: chrchr-github

lib/tokenlist.cpp

@@ -1696,6 +1696,8 @@ static Token * createAstAtToken(Token *tok)
                 tok->next()->astOperand1(tok);
                 tok->next()->astOperand2(colon);
 
+                createAstAtTokenInner(colon, tok->linkAt(1), cpp);
+
                 return decl;
             }
         }

test/testtokenize.cpp

@@ -6701,6 +6701,7 @@ class TestTokenizer : public TestFixture {
         ASSERT_EQUALS("foria:( asize.(", testAst("for(decltype(a.size()) i:a);"));
         ASSERT_EQUALS("forec0{([,(:( fb.return", testAst("for (auto e : c(0, [](auto f) { return f->b; }));")); // #10802
         ASSERT_EQUALS("forvar1{;;(", testAst("for(int var{1};;)")); // #12867
+        ASSERT_EQUALS("forxg{([(:( si.return", testAst("for (auto [x] : g([](S s) { return s.i; })) {}")); // #11861
 
         // for with initializer (c++20)
         ASSERT_EQUALS("forab=ca:;(", testAst("for(a=b;int c:a)"));