Metavariable repetition in the matcher and the transcriber

According to chapter 3.1., a metavariable must appear in exactly the same number, kind, and nesting order of repetitions in the transcriber as it did in the matcher. Based on this, I expected the following code (playground) not to compile, but it does compile without error.

macro_rules! repeat1 {
    ($($x:expr),+) => {
        $(let _ = $x;)*
    };
}
    
macro_rules! repeat2 {
    ($($x:expr),+) => {
        $(let _ = $x;)?
    };
}

macro_rules! repeat3 {
    ($($x:expr),*) => {
        $(let _ = $x;)?
    };
}
    
fn main() {
    repeat1!(1,2,3); 
    repeat2!(1,2,3); 
    repeat3!(1,2,3); 
}

Start with chapter 3.1 of the Rust Reference and reproduce the repeat1, repeat2, and repeat3 examples from the issue or its playground link. Compare the stated metavariable repetition rule with the observed compiler behavior, then determine whether the Reference wording or the documented examples need correction.