75 lines
1.4 KiB
Rust
75 lines
1.4 KiB
Rust
// Copyright 2015 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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// aux-build:custom_derive_plugin_attr.rs
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// ignore-stage1
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#![feature(plugin, custom_derive, custom_attribute)]
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#![plugin(custom_derive_plugin_attr)]
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trait TotalSum {
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fn total_sum(&self) -> isize;
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}
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impl TotalSum for isize {
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fn total_sum(&self) -> isize {
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*self
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}
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}
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struct Seven;
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impl TotalSum for Seven {
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fn total_sum(&self) -> isize {
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7
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}
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}
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#[derive(TotalSum)]
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struct Foo {
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seven: Seven,
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bar: Bar,
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baz: isize,
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#[ignore]
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nan: NaN,
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}
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#[derive(TotalSum)]
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struct Bar {
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quux: isize,
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bleh: isize,
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#[ignore]
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nan: NaN2
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}
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struct NaN;
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impl TotalSum for NaN {
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fn total_sum(&self) -> isize {
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panic!();
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}
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}
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struct NaN2;
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pub fn main() {
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let v = Foo {
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seven: Seven,
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bar: Bar {
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quux: 9,
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bleh: 3,
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nan: NaN2
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},
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baz: 80,
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nan: NaN
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};
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assert_eq!(v.total_sum(), 99);
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}
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