Closed
Description
// synext.rs
#![feature(plugin_registrar, quote, rustc_private)]
#![crate_type = "dylib"]
extern crate syntax;
extern crate rustc;
use syntax::ext::base::{MacResult, MacEager};
use syntax::ast;
use syntax::codemap::Span;
use syntax::ext::base::ExtCtxt;
#[plugin_registrar]
pub fn registrar(reg: &mut rustc::plugin::Registry) {
reg.register_macro("test", expand);
}
fn expand(cx: &mut ExtCtxt, _sp: Span,
_tts: &[ast::TokenTree]) -> Box<MacResult+'static> {
MacEager::expr(quote_expr!(cx,
std::io::println("one");
std::io::println("two");
))
} // test-synext.rs
#![feature(phase)]
#[phase(plugin)] extern crate synext;
fn main() {
test!()
}Compiling those with rustc synext.rs && rustc -L . test-synext.rs --pretty expanded with
#![feature(phase)]
#![feature(phase)]
#![no_std]
#![feature(globs)]
#[phase(plugin, link)]
extern crate "std" as std;
extern crate "native" as rt;
#[phase(plugin)]
extern crate synext;
#[prelude_import]
use std::prelude::*;
fn main() { std::io::println("one") }i.e. the std::io::println("two") is gone. Wrapping the two expressions into a { ... } works.