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use crate::deriving::generic::ty::*;
use crate::deriving::generic::*;
use crate::deriving::path_std;
use rustc_ast::ptr::P;
use rustc_ast::{self as ast, Expr, MetaItem};
use rustc_expand::base::{Annotatable, ExtCtxt};
use rustc_span::symbol::{sym, Ident};
use rustc_span::Span;
pub fn expand_deriving_eq(
cx: &mut ExtCtxt<'_>,
span: Span,
mitem: &MetaItem,
item: &Annotatable,
push: &mut dyn FnMut(Annotatable),
) {
let span = cx.with_def_site_ctxt(span);
let inline = cx.meta_word(span, sym::inline);
let hidden = rustc_ast::attr::mk_nested_word_item(Ident::new(sym::hidden, span));
let doc = rustc_ast::attr::mk_list_item(Ident::new(sym::doc, span), vec![hidden]);
let no_coverage = cx.meta_word(span, sym::no_coverage);
let attrs = vec![cx.attribute(inline), cx.attribute(doc), cx.attribute(no_coverage)];
let trait_def = TraitDef {
span,
attributes: Vec::new(),
path: path_std!(cmp::Eq),
additional_bounds: Vec::new(),
generics: Bounds::empty(),
is_unsafe: false,
supports_unions: true,
methods: vec![MethodDef {
name: sym::assert_receiver_is_total_eq,
generics: Bounds::empty(),
explicit_self: borrowed_explicit_self(),
args: vec![],
ret_ty: nil_ty(),
attributes: attrs,
is_unsafe: false,
unify_fieldless_variants: true,
combine_substructure: combine_substructure(Box::new(|a, b, c| {
cs_total_eq_assert(a, b, c)
})),
}],
associated_types: Vec::new(),
};
super::inject_impl_of_structural_trait(cx, span, item, path_std!(marker::StructuralEq), push);
trait_def.expand_ext(cx, mitem, item, push, true)
}
fn cs_total_eq_assert(
cx: &mut ExtCtxt<'_>,
trait_span: Span,
substr: &Substructure<'_>,
) -> P<Expr> {
let mut stmts = Vec::new();
let mut process_variant = |variant: &ast::VariantData| {
for field in variant.fields() {
// let _: AssertParamIsEq<FieldTy>;
super::assert_ty_bounds(
cx,
&mut stmts,
field.ty.clone(),
field.span,
&[sym::cmp, sym::AssertParamIsEq],
);
}
};
match *substr.fields {
StaticStruct(vdata, ..) => {
process_variant(vdata);
}
StaticEnum(enum_def, ..) => {
for variant in &enum_def.variants {
process_variant(&variant.data);
}
}
_ => cx.span_bug(trait_span, "unexpected substructure in `derive(Eq)`"),
}
cx.expr_block(cx.block(trait_span, stmts))
}
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