Function rustc_ap_rustc_parse::parse_in

pub fn parse_in<'a, T>(
    sess: &'a ParseSess, 
    tts: TokenStream, 
    name: &'static str, 
    f: impl FnMut(&mut Parser<'a>) -> PResult<'a, T>
) -> PResult<'a, T>

Runs the given subparser f on the tokens of the given attr's item.