f66a3f7bba
MacEager is a MacResult implementation for the common case where you've already built each form of AST that you might return. Fixes #17637. Based on #18814. This is a [breaking-change] for syntax extensions: * MacExpr::new becomes MacEager::expr. * MacPat::new becomes MacEager::pat. * MacItems::new becomes MacEager::items. It takes a SmallVector directly, not an iterator.
37 lines
1.1 KiB
Rust
37 lines
1.1 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// ignore-stage1
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// force-host
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#![feature(plugin_registrar, quote)]
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#![crate_type = "dylib"]
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extern crate syntax;
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extern crate rustc;
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use syntax::ast;
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use syntax::codemap;
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use syntax::ext::base::{ExtCtxt, MacResult, MacEager};
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use syntax::util::small_vector::SmallVector;
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use rustc::plugin::Registry;
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#[plugin_registrar]
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pub fn plugin_registrar(reg: &mut Registry) {
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reg.register_macro("multiple_items", expand)
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}
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fn expand(cx: &mut ExtCtxt, _: codemap::Span, _: &[ast::TokenTree]) -> Box<MacResult+'static> {
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MacEager::items(SmallVector::many(vec![
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quote_item!(cx, struct Struct1;).unwrap(),
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quote_item!(cx, struct Struct2;).unwrap()
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]))
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}
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