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Auto merge of #36316 - jseyfried:custom_derive_internal_unstable, r=eddyb
Avoid instaiblity errors in code generated by `syntax_ext::deriving::call_intrinsic()` r? @eddyb
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commit
0b02ae02bb
@ -338,10 +338,19 @@ fn hygienic_type_parameter(item: &Annotatable, base: &str) -> String {
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/// Constructs an expression that calls an intrinsic
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fn call_intrinsic(cx: &ExtCtxt,
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span: Span,
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mut span: Span,
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intrinsic: &str,
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args: Vec<P<ast::Expr>>)
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-> P<ast::Expr> {
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span.expn_id = cx.codemap().record_expansion(codemap::ExpnInfo {
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call_site: span,
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callee: codemap::NameAndSpan {
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format: codemap::MacroAttribute(intern("derive")),
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span: Some(span),
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allow_internal_unstable: true,
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},
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});
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let path = cx.std_path(&["intrinsics", intrinsic]);
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let call = cx.expr_call_global(span, path, args);
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@ -0,0 +1,81 @@
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// Copyright 2016 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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// force-host
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#![feature(plugin_registrar, rustc_private, item_like_imports)]
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extern crate syntax;
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extern crate syntax_ext;
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extern crate rustc_plugin;
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use syntax_ext::deriving;
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use deriving::generic::*;
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use deriving::generic::ty::*;
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use rustc_plugin::Registry;
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use syntax::ast::*;
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use syntax::codemap::Span;
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use syntax::ext::base::*;
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use syntax::ext::build::AstBuilder;
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use syntax::parse::token::{intern, InternedString};
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use syntax::ptr::P;
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#[plugin_registrar]
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pub fn plugin_registrar(reg: &mut Registry) {
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reg.register_syntax_extension(intern("derive_CustomPartialEq"),
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MultiDecorator(Box::new(expand_deriving_partial_eq)));
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}
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fn expand_deriving_partial_eq(cx: &mut ExtCtxt, span: Span, mitem: &MetaItem, item: &Annotatable,
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push: &mut FnMut(Annotatable)) {
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// structures are equal if all fields are equal, and non equal, if
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// any fields are not equal or if the enum variants are different
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fn cs_eq(cx: &mut ExtCtxt, span: Span, substr: &Substructure) -> P<Expr> {
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cs_fold(true,
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|cx, span, subexpr, self_f, other_fs| {
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let other_f = (other_fs.len(), other_fs.get(0)).1.unwrap();
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let eq = cx.expr_binary(span, BinOpKind::Eq, self_f, other_f.clone());
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cx.expr_binary(span, BinOpKind::And, subexpr, eq)
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},
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cx.expr_bool(span, true),
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Box::new(|cx, span, _, _| cx.expr_bool(span, false)),
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cx,
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span,
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substr)
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}
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let inline = cx.meta_word(span, InternedString::new("inline"));
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let attrs = vec!(cx.attribute(span, inline));
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let methods = vec![MethodDef {
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name: "eq",
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generics: LifetimeBounds::empty(),
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explicit_self: borrowed_explicit_self(),
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args: vec!(borrowed_self()),
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ret_ty: Literal(deriving::generic::ty::Path::new_local("bool")),
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attributes: attrs,
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is_unsafe: false,
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unify_fieldless_variants: true,
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combine_substructure: combine_substructure(Box::new(cs_eq)),
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}];
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let trait_def = TraitDef {
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span: span,
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attributes: Vec::new(),
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path: deriving::generic::ty::Path::new(vec!["std", "cmp", "PartialEq"]),
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additional_bounds: Vec::new(),
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generics: LifetimeBounds::empty(),
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is_unsafe: false,
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supports_unions: false,
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methods: methods,
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associated_types: Vec::new(),
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};
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trait_def.expand(cx, mitem, item, push)
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}
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src/test/run-pass-fulldeps/custom-derive-partial-eq.rs
Normal file
22
src/test/run-pass-fulldeps/custom-derive-partial-eq.rs
Normal file
@ -0,0 +1,22 @@
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// Copyright 2016 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_partial_eq.rs
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// ignore-stage1
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// ignore-pretty : (#23623) problems when ending with // comments
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#![feature(plugin, custom_derive)]
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#![plugin(custom_derive_partial_eq)]
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#![allow(unused)]
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#[derive(CustomPartialEq)] // Check that this is not a stability error.
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enum E { V1, V2 }
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fn main() {}
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