Macro braces

macro_rules! braces {
    ($i:expr, $submac:ident!( $($args:tt)* )) => { ... };
    ($i:expr, $f:expr) => { ... };
}

Parse inside of { } curly braces.

This macro parses a set of balanced braces and invokes a sub-parser on the content inside. The sub-parser is required to consume all tokens within the braces in order for this parser to return successfully.

• Syntax: braces!(CONTENT)
• Output: (token::Brace, CONTENT)

#[macro_use]
extern crate syn;

use syn::Expr;
use syn::token::Brace;

/// Parses an expression inside of braces.
///
/// Example: `{1 + 1}`
named!(expr_paren -> (Brace, Expr), braces!(syn!(Expr)));

This macro is available if Syn is built with the "parsing" feature.