fix #12657: Syntax error. Unexpected tokens in initializer. [internalAstError] (danmar#7580)

Author: ludviggunne

lib/tokenlist.cpp

@@ -1070,7 +1070,7 @@ static void compilePrecedence2(Token *&tok, AST_state& state)
             state.inGeneric = inGenericSaved;
             tok = tok->link()->next();
             if (Token::simpleMatch(tok, "::"))
-                compileBinOp(tok, state, compileTerm);
+                compileBinOp(tok, state, compileScope);
         } else if (iscast(tok, state.cpp) && Token::simpleMatch(tok->link(), ") {") &&
                    Token::simpleMatch(tok->link()->linkAt(1), "} [")) {
             Token *cast = tok;

test/testtokenize.cpp

@@ -400,6 +400,7 @@ class TestTokenizer : public TestFixture {
         TEST_CASE(astnoexcept);
         TEST_CASE(astvardecl);
         TEST_CASE(astnewscoped);
+        TEST_CASE(astdecltypescope);
 
         TEST_CASE(startOfExecutableScope);
 
@@ -7130,6 +7131,10 @@ class TestTokenizer : public TestFixture {
         ASSERT_EQUALS("(return (new (( (:: (:: (:: A B) C) D) true)))", testAst("return new A::B::C::D(true);", AstStyle::Z3));
     }
 
+    void astdecltypescope() {
+        ASSERT_EQUALS("sizedecltypethism_P.(XSize::::{", testAst("size { decltype(this->m_P)::X::Size };"));
+    }
+
 #define isStartOfExecutableScope(offset, code) isStartOfExecutableScope_(offset, code, __FILE__, __LINE__)
     template<size_t size>
     bool isStartOfExecutableScope_(int offset, const char (&code)[size], const char* file, int line) {