Enum rustc_expand::mbe::macro_parser::ParseResult

pub(crate) enum ParseResult<T, F> {
    Success(T),
    Failure(F),
    Error(Span, String),
    ErrorReported(ErrorGuaranteed),
}

Represents the possible results of an attempted parse.

Variants

Success(T)

Parsed successfully.

Failure(F)

Arm failed to match. If the second parameter is token::Eof, it indicates an unexpected end of macro invocation. Otherwise, it indicates that no rules expected the given token. The usize is the approximate position of the token in the input token stream.

Error(Span, String)

Fatal error (malformed macro?). Abort compilation.

ErrorReported(ErrorGuaranteed)

Layout

Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.