Macro extract_macro_single_unnamed_arg

macro_rules! extract_macro_single_unnamed_arg {
    ($db:expr, $syntax:expr, $pattern:pat) => { ... };
}

Macro to extract a single unnamed argument of an inline macro. Gets the pattern for the allowed bracket types, and returns the argument expression.

Example usage (allowing () or {} brackets): let arg = extract_macro_single_unnamed_arg!( db, syntax, ast::WrappedArgList::ParenthesizedArgList() | ast::WrappedArgList::BracedArgList() );