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Use underscore consts on Rust 1.37+

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This commit is contained in:
Taiki Endo
2020-06-07 14:41:07 +09:00
parent 6980727d74
commit a50e1c20e9
14 changed files with 60 additions and 28 deletions
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serde_derive/Cargo.toml
+1 -1
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@@ -9,7 +9,7 @@ repository = "https://github.com/serde-rs/serde"
documentation = "https://serde.rs/derive.html"
keywords = ["serde", "serialization", "no_std"]
readme = "crates-io.md"
include = ["src/**/*.rs", "crates-io.md", "README.md", "LICENSE-APACHE", "LICENSE-MIT"]
include = ["build.rs", "src/**/*.rs", "crates-io.md", "README.md", "LICENSE-APACHE", "LICENSE-MIT"]
[features]
default = []
serde_derive/build.rs
+30
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@@ -0,0 +1,30 @@
use std::env;
use std::process::Command;
use std::str;
// The rustc-cfg strings below are *not* public API. Please let us know by
// opening a GitHub issue if your build environment requires some way to enable
// these cfgs other than by executing our build script.
fn main() {
let minor = match rustc_minor_version() {
Some(minor) => minor,
None => return,
};
// Underscore const names stabilized in Rust 1.37:
// https://github.com/rust-lang/rust/pull/61347
if minor >= 37 {
println!("cargo:rustc-cfg=underscore_consts");
}
}
fn rustc_minor_version() -> Option<u32> {
let rustc = env::var_os("RUSTC")?;
let output = Command::new(rustc).arg("--version").output().ok()?;
let version = str::from_utf8(&output.stdout).ok()?;
let mut pieces = version.split('.');
if pieces.next() != Some("rustc 1") {
return None;
}
pieces.next()?.parse().ok()
}
serde_derive/src/dummy.rs
+7 -5
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@@ -1,4 +1,5 @@
use proc_macro2::{Ident, Span, TokenStream};
use proc_macro2::{Ident, TokenStream};
use quote::format_ident;
use syn;
use try;
@@ -11,10 +12,11 @@ pub fn wrap_in_const(
) -> TokenStream {
let try_replacement = try::replacement();
let dummy_const = Ident::new(
&format!("_IMPL_{}_FOR_{}", trait_, unraw(ty)),
Span::call_site(),
);
let dummy_const = if cfg!(underscore_consts) {
format_ident!("_")
} else {
format_ident!("_IMPL_{}_FOR_{}", trait_, unraw(ty))
};
let use_serde = match serde_path {
Some(path) => quote! {
test_suite/tests/expand/de_enum.expanded.rs
+2 -2
View File
@@ -9,7 +9,7 @@ enum DeEnum<B, C, D> {
}
#[doc(hidden)]
#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
const _IMPL_SERIALIZE_FOR_DeEnum: () = {
const _: () = {
#[allow(rust_2018_idioms, clippy::useless_attribute)]
extern crate serde as _serde;
#[automatically_derived]
@@ -261,7 +261,7 @@ const _IMPL_SERIALIZE_FOR_DeEnum: () = {
};
#[doc(hidden)]
#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
const _IMPL_DESERIALIZE_FOR_DeEnum: () = {
const _: () = {
#[allow(rust_2018_idioms, clippy::useless_attribute)]
extern crate serde as _serde;
#[automatically_derived]
test_suite/tests/expand/default_ty_param.expanded.rs
+2 -2
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@@ -10,7 +10,7 @@ struct DefaultTyParam<T: AssociatedType<X = i32> = i32> {
}
#[doc(hidden)]
#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
const _IMPL_SERIALIZE_FOR_DefaultTyParam: () = {
const _: () = {
#[allow(rust_2018_idioms, clippy::useless_attribute)]
extern crate serde as _serde;
#[automatically_derived]
@@ -45,7 +45,7 @@ const _IMPL_SERIALIZE_FOR_DefaultTyParam: () = {
};
#[doc(hidden)]
#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
const _IMPL_DESERIALIZE_FOR_DefaultTyParam: () = {
const _: () = {
#[allow(rust_2018_idioms, clippy::useless_attribute)]
extern crate serde as _serde;
#[automatically_derived]
test_suite/tests/expand/generic_enum.expanded.rs
+2 -2
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@@ -7,7 +7,7 @@ pub enum GenericEnum<T, U> {
}
#[doc(hidden)]
#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
const _IMPL_SERIALIZE_FOR_GenericEnum: () = {
const _: () = {
#[allow(rust_2018_idioms, clippy::useless_attribute)]
extern crate serde as _serde;
#[automatically_derived]
@@ -110,7 +110,7 @@ const _IMPL_SERIALIZE_FOR_GenericEnum: () = {
};
#[doc(hidden)]
#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
const _IMPL_DESERIALIZE_FOR_GenericEnum: () = {
const _: () = {
#[allow(rust_2018_idioms, clippy::useless_attribute)]
extern crate serde as _serde;
#[automatically_derived]
test_suite/tests/expand/generic_struct.expanded.rs
+4 -4
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@@ -4,7 +4,7 @@ pub struct GenericStruct<T> {
}
#[doc(hidden)]
#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
const _IMPL_SERIALIZE_FOR_GenericStruct: () = {
const _: () = {
#[allow(rust_2018_idioms, clippy::useless_attribute)]
extern crate serde as _serde;
#[automatically_derived]
@@ -38,7 +38,7 @@ const _IMPL_SERIALIZE_FOR_GenericStruct: () = {
};
#[doc(hidden)]
#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
const _IMPL_DESERIALIZE_FOR_GenericStruct: () = {
const _: () = {
#[allow(rust_2018_idioms, clippy::useless_attribute)]
extern crate serde as _serde;
#[automatically_derived]
@@ -400,7 +400,7 @@ const _IMPL_DESERIALIZE_FOR_GenericStruct: () = {
pub struct GenericNewTypeStruct<T>(T);
#[doc(hidden)]
#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
const _IMPL_SERIALIZE_FOR_GenericNewTypeStruct: () = {
const _: () = {
#[allow(rust_2018_idioms, clippy::useless_attribute)]
extern crate serde as _serde;
#[automatically_derived]
@@ -422,7 +422,7 @@ const _IMPL_SERIALIZE_FOR_GenericNewTypeStruct: () = {
};
#[doc(hidden)]
#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
const _IMPL_DESERIALIZE_FOR_GenericNewTypeStruct: () = {
const _: () = {
#[allow(rust_2018_idioms, clippy::useless_attribute)]
extern crate serde as _serde;
#[automatically_derived]
test_suite/tests/expand/generic_tuple_struct.expanded.rs
+1 -1
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@@ -2,7 +2,7 @@ use serde::{Deserialize, Serialize};
pub struct GenericTupleStruct<T, U>(T, U);
#[doc(hidden)]
#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
const _IMPL_DESERIALIZE_FOR_GenericTupleStruct: () = {
const _: () = {
#[allow(rust_2018_idioms, clippy::useless_attribute)]
extern crate serde as _serde;
#[automatically_derived]
test_suite/tests/expand/lifetimes.expanded.rs
+2 -2
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@@ -7,7 +7,7 @@ enum Lifetimes<'a> {
}
#[doc(hidden)]
#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
const _IMPL_SERIALIZE_FOR_Lifetimes: () = {
const _: () = {
#[allow(rust_2018_idioms, clippy::useless_attribute)]
extern crate serde as _serde;
#[automatically_derived]
@@ -91,7 +91,7 @@ const _IMPL_SERIALIZE_FOR_Lifetimes: () = {
};
#[doc(hidden)]
#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
const _IMPL_DESERIALIZE_FOR_Lifetimes: () = {
const _: () = {
#[allow(rust_2018_idioms, clippy::useless_attribute)]
extern crate serde as _serde;
#[automatically_derived]
test_suite/tests/expand/named_map.expanded.rs
+2 -2
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@@ -6,7 +6,7 @@ struct SerNamedMap<'a, 'b, A: 'a, B: 'b, C> {
}
#[doc(hidden)]
#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
const _IMPL_SERIALIZE_FOR_SerNamedMap: () = {
const _: () = {
#[allow(rust_2018_idioms, clippy::useless_attribute)]
extern crate serde as _serde;
#[automatically_derived]
@@ -59,7 +59,7 @@ struct DeNamedMap<A, B, C> {
}
#[doc(hidden)]
#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
const _IMPL_DESERIALIZE_FOR_DeNamedMap: () = {
const _: () = {
#[allow(rust_2018_idioms, clippy::useless_attribute)]
extern crate serde as _serde;
#[automatically_derived]
test_suite/tests/expand/named_tuple.expanded.rs
+2 -2
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@@ -2,7 +2,7 @@ use serde::{Deserialize, Serialize};
struct SerNamedTuple<'a, 'b, A: 'a, B: 'b, C>(&'a A, &'b mut B, C);
#[doc(hidden)]
#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
const _IMPL_SERIALIZE_FOR_SerNamedTuple: () = {
const _: () = {
#[allow(rust_2018_idioms, clippy::useless_attribute)]
extern crate serde as _serde;
#[automatically_derived]
@@ -51,7 +51,7 @@ const _IMPL_SERIALIZE_FOR_SerNamedTuple: () = {
struct DeNamedTuple<A, B, C>(A, B, C);
#[doc(hidden)]
#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
const _IMPL_DESERIALIZE_FOR_DeNamedTuple: () = {
const _: () = {
#[allow(rust_2018_idioms, clippy::useless_attribute)]
extern crate serde as _serde;
#[automatically_derived]
test_suite/tests/expand/named_unit.expanded.rs
+2 -2
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@@ -2,7 +2,7 @@ use serde::{Deserialize, Serialize};
struct NamedUnit;
#[doc(hidden)]
#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
const _IMPL_SERIALIZE_FOR_NamedUnit: () = {
const _: () = {
#[allow(rust_2018_idioms, clippy::useless_attribute)]
extern crate serde as _serde;
#[automatically_derived]
@@ -17,7 +17,7 @@ const _IMPL_SERIALIZE_FOR_NamedUnit: () = {
};
#[doc(hidden)]
#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
const _IMPL_DESERIALIZE_FOR_NamedUnit: () = {
const _: () = {
#[allow(rust_2018_idioms, clippy::useless_attribute)]
extern crate serde as _serde;
#[automatically_derived]
test_suite/tests/expand/ser_enum.expanded.rs
+1 -1
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@@ -12,7 +12,7 @@ where
}
#[doc(hidden)]
#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
const _IMPL_SERIALIZE_FOR_SerEnum: () = {
const _: () = {
#[allow(rust_2018_idioms, clippy::useless_attribute)]
extern crate serde as _serde;
#[automatically_derived]
test_suite/tests/expand/void.expanded.rs
+2 -2
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@@ -2,7 +2,7 @@ use serde::{Deserialize, Serialize};
enum Void {}
#[doc(hidden)]
#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
const _IMPL_SERIALIZE_FOR_Void: () = {
const _: () = {
#[allow(rust_2018_idioms, clippy::useless_attribute)]
extern crate serde as _serde;
#[automatically_derived]
@@ -17,7 +17,7 @@ const _IMPL_SERIALIZE_FOR_Void: () = {
};
#[doc(hidden)]
#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
const _IMPL_DESERIALIZE_FOR_Void: () = {
const _: () = {
#[allow(rust_2018_idioms, clippy::useless_attribute)]
extern crate serde as _serde;
#[automatically_derived]