Macro proc_macro_error::abort

macro_rules! abort {
    ($span:expr, $fmt:expr, $($args:expr),*) => { ... };
    ($span:expr, $msg:expr) => { ... };
    ($err:expr) => { ... };
}

Makes a MacroError instance from provided arguments and aborts showing it.

Syntax

This macro is meant to be a panic! drop-in replacement so its syntax is very similar to panic!, but it has three forms instead of two:

1. “panic-format-like” form: `abort!(span_expr, format_str_literal [, format_args…])

   First argument is a span, all the rest is passed to format! to build the error message.

2. “panic-single-arg-like” form: abort!(span_expr, error_expr)

   First argument is a span, the second is the error message, it must implement ToString.

3. MacroError::abort-like form: abort!(error_expr)

   Literally MacroError::from(arg).abort(). It’s here just for convenience so [abort!] can be used with instances of syn::Error, MacroError, &str, String and so on…