Function terminated_parser 

pub fn terminated_parser<T, P, F: FnMut(ParseStream<'_>) -> Result<T>>(
    terminator: P,
    parser: F,
) -> impl FnOnce(ParseStream<'_>) -> Result<Punctuated<T, P::Token>>
where
    P: Peek,
    P::Token: Parse,

Returns a syn::parse::Parser which parses a stream of zero or more occurrences of T separated by punctuation of type P, with optional trailing punctuation.

This is functionally the same as Punctuated::parse_terminated, but accepts a closure rather than a function pointer.