Struct Incomplete

pub struct Incomplete { /* private fields */ }

Incomplete is used in a #[proc_macro] to check that all tokens in the Input have been parsed completely or otherwise provide a printable diagnostic-friendly representation of remaining tokens.

let (ast, trailing) = match parse() {
    Ok(ok) => ok,
    Err(err) => panic!("error parsing in `my_example` macro: {:#?}", err),
};
if let Ok(diagnostic) = Incomplete::from_stream(trailing) {
    panic!("unexpected tokens at end of input:\n\n{}", diagnostic);
}

Implementations

impl Incomplete

pub fn from_stream<I>(input: I) -> Option<Incomplete>

where I: StreamOnce<Item = Token>, I::Error: ParseError<I::Item, I::Range, I::Position>,

Trait Implementations

impl Debug for Incomplete

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for Incomplete

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.