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Delete read_enum_variant names

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This commit is contained in:
Mark Rousskov 2022-02-09 17:12:20 -05:00
parent c6bd6b444c
commit c87060a72d
2 changed files with 3 additions and 11 deletions
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8
compiler/rustc_macros/src/serialize.rs
View File

@ -60,13 +60,6 @@ fn decodable_body(
quote! { #idx => { #construct } }
})
.collect();
let names: TokenStream = variants
.iter()
.map(|vi| {
let variant_name = vi.ast().ident.to_string();
quote!(#variant_name,)
})
.collect();
let message = format!(
"invalid enum variant tag while decoding `{}`, expected 0..{}",
ty_name,
@ -75,7 +68,6 @@ fn decodable_body(
quote! {
::rustc_serialize::Decoder::read_enum_variant(
__decoder,
&[#names],
|__decoder, __variant_idx| {
match __variant_idx {
#match_inner

6
compiler/rustc_serialize/src/serialize.rs
View File

@ -202,7 +202,7 @@ pub trait Decoder {
fn read_raw_bytes_into(&mut self, s: &mut [u8]);
#[inline]
fn read_enum_variant<T, F>(&mut self, _names: &[&str], mut f: F) -> T
fn read_enum_variant<T, F>(&mut self, mut f: F) -> T
where
F: FnMut(&mut Self, usize) -> T,
{
@ -255,7 +255,7 @@ pub trait Decoder {
where
F: FnMut(&mut Self, bool) -> T,
{
self.read_enum_variant(&["None", "Some"], move |this, idx| match idx {
self.read_enum_variant(move |this, idx| match idx {
0 => f(this, false),
1 => f(this, true),
_ => panic!("read_option: expected 0 for None or 1 for Some"),
@ -571,7 +571,7 @@ impl<S: Encoder, T1: Encodable<S>, T2: Encodable<S>> Encodable<S> for Result<T1,
impl<D: Decoder, T1: Decodable<D>, T2: Decodable<D>> Decodable<D> for Result<T1, T2> {
fn decode(d: &mut D) -> Result<T1, T2> {
d.read_enum_variant(&["Ok", "Err"], |d, disr| match disr {
d.read_enum_variant(|d, disr| match disr {
0 => Ok(d.read_enum_variant_arg(|d| T1::decode(d))),
1 => Err(d.read_enum_variant_arg(|d| T2::decode(d))),
_ => panic!("Encountered invalid discriminant while decoding `Result`."),