Macro parse_unadvised 

macro_rules! parse_unadvised {
    {
    $content:ident
} => { ... };
    {
    $content:ident => || $( $call:tt )*
} => { ... };
}

Within parse_adviseable, handle errors without giving advice

parse_unadvised! { CONTENT_IDENT => || CLOSURE_BODY } expects CONTENT_IDENT to be the contents from braced!, [bracketed!] or parenthesized!. Calls the closure. Errors within the closure won’t get advice.

parse_unadvised! { CONTENT_IDENT } shorthand for calling .parse() on the content.

Sketch

let something;
let _ = bracketed!(something in input);
parse_unadvised! {
    something => || {
        // do something with something, eg something.parse()
        Ok(...)
    }
}