Trait proc_macro_kwargs::parse::MacroArg[][src]

pub trait MacroArg: Sized {
    fn parse_macro_arg(stream: ParseStream<'_>) -> Result<Self>;
}
Expand description

A type that can be parsed as an argument to a macro.

This is often implemented by delegating to syn’s Parse.

However, sometimes it can behave differently. For example, nested MacroKeywordArgs require surrounding braces {} when parsed as a MacroArg, but not when parsed via syn’s Parse.

This gives the effect of requiring braces when nested (as a MacroArg), but not at the top level (via syn’s Parse).

Required methods

Parse the argument to the macro

Implementations on Foreign Types

Parses an optional MacroArg, always returning the Some variant

The None variant will only be generated if the argument is missing

Implementors