It can get more subtle than that too, though. For example, see this recent discussion I had on this topic: https://www.reddit.com/r/programming/comments/72p472/why_did...
I still chuckle when randos make arguments like "C++ can't be parsed with an LALR parser", or "virtual functions are more expensive than function pointers", as if the former is the end of the world, and the latter is a checkmate that will suddenly make my knees week, arms heavy. There's code in my editor, and it's just spaghetti.
I'm not an expert on parsers but I don't think LALR parser can evaluate constexpr C++ functions which is required for parsing C++.
E.g. in the following code, expression `A<f()>::a * u` will parse either as a variable declaration (int* u) or a multiplication (5 * 5) depending on the value returned by constexpr function f:
template<bool b> class A {};
template<> struct A<true> { typedef int a; };
template<> struct A<false> { static const int a = 5; };
constexpr bool f() { return true; }
const int u = 5;
int main() { A<f()>::a * u; }