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use UFCS in #[deriving(Hash)]

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expansion now uses `::std:#️⃣:Hash::hash(&*__self_0_0, __arg_0)` instead of
`(*__self_0_0).hash(__arg_0)`

closes #21160
This commit is contained in:
Jorge Aparicio 2015-01-14 18:22:16 -05:00
parent 896cb36eca
commit 59e9cfa0cf
4 changed files with 37 additions and 2 deletions
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14
src/libsyntax/ext/deriving/hash.rs
View file

@ -65,9 +65,19 @@ fn hash_substructure(cx: &mut ExtCtxt, trait_span: Span, substr: &Substructure)
[ref state_expr] => state_expr,
_ => cx.span_bug(trait_span, "incorrect number of arguments in `deriving(Hash)`")
};
let hash_ident = substr.method_ident;
let hash_path = {
let strs = vec![
cx.ident_of("std"),
cx.ident_of("hash"),
cx.ident_of("Hash"),
cx.ident_of("hash"),
];
cx.expr_path(cx.path_global(trait_span, strs))
};
let call_hash = |&: span, thing_expr| {
let expr = cx.expr_method_call(span, thing_expr, hash_ident, vec!(state_expr.clone()));
let ref_thing = cx.expr_addr_of(span, thing_expr);
let expr = cx.expr_call(span, hash_path.clone(), vec!(ref_thing, state_expr.clone()));
cx.stmt_expr(expr)
};
let mut stmts = Vec::new();