With a bit of fiddeling you can use every kind of bracket to basically make function calls in c++
Here are the links to the snippets, all compile and run
Rust: https://godbolt.org/z/bM3d7bG14
Funny that you put rust as the "uses parenthesis for function calls". When in rust you can use any bracket for macro invocations:
let v1 = vec!(1,2,3);
let v2 = vec![1,2,3];
let v3 = vec!{1,2,3};
These are valid and have the exact same meaning.