Rollup merge of rust-lang#49101 - mark-i-m:stabilize_i128, r=nagisa

Stabilize 128-bit integers 🎉

cc rust-lang#35118

EDIT: This should be merged only after the following have been merged:
- [x] rust-lang/compiler-builtins#236
- [x] rust-lang/book#1230

src/doc/unstable-book/src/language-features/repr128.md

@@ -0,0 +1,18 @@
+# `repr128`
+
+The tracking issue for this feature is: [#35118]
+
+[#35118]: https://github.com/rust-lang/rust/issues/35118
+
+------------------------
+
+The `repr128` feature adds support for `#[repr(u128)]` on `enum`s.
+
+```rust
+#![feature(repr128)]
+
+#[repr(u128)]
+enum Foo {
+    Bar(u64),
+}
+```

src/liballoc/benches/lib.rs

@@ -10,7 +10,7 @@
 
 #![deny(warnings)]
 
-#![feature(i128_type)]
+#![cfg_attr(stage0, feature(i128_type))]
 #![feature(rand)]
 #![feature(repr_simd)]
 #![feature(test)]

src/liballoc/lib.rs

@@ -97,7 +97,7 @@
 #![feature(from_ref)]
 #![feature(fundamental)]
 #![feature(generic_param_attrs)]
-#![feature(i128_type)]
+#![cfg_attr(stage0, feature(i128_type))]
 #![feature(iter_rfold)]
 #![feature(lang_items)]
 #![feature(needs_allocator)]

src/libcore/hash/mod.rs

@@ -308,7 +308,7 @@ pub trait Hasher {
     }
     /// Writes a single `u128` into this hasher.
     #[inline]
-    #[unstable(feature = "i128", issue = "35118")]
+    #[stable(feature = "i128", since = "1.26.0")]
     fn write_u128(&mut self, i: u128) {
         self.write(&unsafe { mem::transmute::<_, [u8; 16]>(i) })
     }
@@ -348,7 +348,7 @@ pub trait Hasher {
     }
     /// Writes a single `i128` into this hasher.
     #[inline]
-    #[unstable(feature = "i128", issue = "35118")]
+    #[stable(feature = "i128", since = "1.26.0")]
     fn write_i128(&mut self, i: i128) {
         self.write_u128(i as u128)
     }

src/libcore/lib.rs

@@ -78,7 +78,7 @@
 #![feature(doc_spotlight)]
 #![feature(fn_must_use)]
 #![feature(fundamental)]
-#![feature(i128_type)]
+#![cfg_attr(stage0, feature(i128_type))]
 #![cfg_attr(stage0, feature(inclusive_range_syntax))]
 #![feature(intrinsics)]
 #![feature(iterator_flatten)]

src/libcore/num/i128.rs

@@ -12,6 +12,6 @@
 //!
 //! *[See also the `i128` primitive type](../../std/primitive.i128.html).*
 
-#![unstable(feature = "i128", issue="35118")]
+#![stable(feature = "i128", since = "1.26.0")]
 
-int_module! { i128, #[unstable(feature = "i128", issue="35118")] }
+int_module! { i128, #[stable(feature = "i128", since="1.26.0")] }

src/libcore/num/mod.rs

@@ -1635,11 +1635,7 @@ impl i64 {
 #[lang = "i128"]
 impl i128 {
     int_impl! { i128, i128, u128, 128, -170141183460469231731687303715884105728,
-        170141183460469231731687303715884105727, "#![feature(i128_type)]
-#![feature(i128)]
-# fn main() {
-", "
-# }" }
+        170141183460469231731687303715884105727, "", "" }
 }
 
 #[cfg(target_pointer_width = "16")]
@@ -3493,12 +3489,7 @@ impl u64 {
 
 #[lang = "u128"]
 impl u128 {
-    uint_impl! { u128, u128, 128, 340282366920938463463374607431768211455, "#![feature(i128_type)]
-#![feature(i128)]
-
-# fn main() {
-", "
-# }" }
+    uint_impl! { u128, u128, 128, 340282366920938463463374607431768211455, "", "" }
 }
 
 #[cfg(target_pointer_width = "16")]
@@ -4055,39 +4046,39 @@ macro_rules! impl_from {
 impl_from! { u8, u16, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
 impl_from! { u8, u32, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
 impl_from! { u8, u64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
-impl_from! { u8, u128, #[unstable(feature = "i128", issue = "35118")] }
+impl_from! { u8, u128, #[stable(feature = "i128", since = "1.26.0")] }
 impl_from! { u8, usize, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
 impl_from! { u16, u32, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
 impl_from! { u16, u64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
-impl_from! { u16, u128, #[unstable(feature = "i128", issue = "35118")] }
+impl_from! { u16, u128, #[stable(feature = "i128", since = "1.26.0")] }
 impl_from! { u32, u64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
-impl_from! { u32, u128, #[unstable(feature = "i128", issue = "35118")] }
-impl_from! { u64, u128, #[unstable(feature = "i128", issue = "35118")] }
+impl_from! { u32, u128, #[stable(feature = "i128", since = "1.26.0")] }
+impl_from! { u64, u128, #[stable(feature = "i128", since = "1.26.0")] }
 
 // Signed -> Signed
 impl_from! { i8, i16, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
 impl_from! { i8, i32, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
 impl_from! { i8, i64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
-impl_from! { i8, i128, #[unstable(feature = "i128", issue = "35118")] }
+impl_from! { i8, i128, #[stable(feature = "i128", since = "1.26.0")] }
 impl_from! { i8, isize, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
 impl_from! { i16, i32, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
 impl_from! { i16, i64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
-impl_from! { i16, i128, #[unstable(feature = "i128", issue = "35118")] }
+impl_from! { i16, i128, #[stable(feature = "i128", since = "1.26.0")] }
 impl_from! { i32, i64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
-impl_from! { i32, i128, #[unstable(feature = "i128", issue = "35118")] }
-impl_from! { i64, i128, #[unstable(feature = "i128", issue = "35118")] }
+impl_from! { i32, i128, #[stable(feature = "i128", since = "1.26.0")] }
+impl_from! { i64, i128, #[stable(feature = "i128", since = "1.26.0")] }
 
 // Unsigned -> Signed
 impl_from! { u8, i16, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
 impl_from! { u8, i32, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
 impl_from! { u8, i64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
-impl_from! { u8, i128, #[unstable(feature = "i128", issue = "35118")] }
+impl_from! { u8, i128, #[stable(feature = "i128", since = "1.26.0")] }
 impl_from! { u16, i32, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
 impl_from! { u16, i64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
-impl_from! { u16, i128, #[unstable(feature = "i128", issue = "35118")] }
+impl_from! { u16, i128, #[stable(feature = "i128", since = "1.26.0")] }
 impl_from! { u32, i64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
-impl_from! { u32, i128, #[unstable(feature = "i128", issue = "35118")] }
-impl_from! { u64, i128, #[unstable(feature = "i128", issue = "35118")] }
+impl_from! { u32, i128, #[stable(feature = "i128", since = "1.26.0")] }
+impl_from! { u64, i128, #[stable(feature = "i128", since = "1.26.0")] }
 
 // Note: integers can only be represented with full precision in a float if
 // they fit in the significand, which is 24 bits in f32 and 53 bits in f64.

src/libcore/num/u128.rs

@@ -12,5 +12,5 @@
 //!
 //! *[See also the `u128` primitive type](../../std/primitive.u128.html).*
 
-#![unstable(feature = "i128", issue="35118")]
-uint_module! { u128, #[unstable(feature = "i128", issue="35118")] }
+#![stable(feature = "i128", since = "1.26.0")]
+uint_module! { u128, #[stable(feature = "i128", since="1.26.0")] }

src/libcore/tests/lib.rs

@@ -23,7 +23,7 @@
 #![feature(fmt_internals)]
 #![feature(hashmap_internals)]
 #![feature(iterator_step_by)]
-#![feature(i128_type)]
+#![cfg_attr(stage0, feature(i128_type))]
 #![cfg_attr(stage0, feature(inclusive_range_syntax))]
 #![feature(iterator_try_fold)]
 #![feature(iterator_flatten)]

src/libproc_macro/lib.rs

@@ -34,7 +34,7 @@
        test(no_crate_inject, attr(deny(warnings))),
        test(attr(allow(dead_code, deprecated, unused_variables, unused_mut))))]
 
-#![feature(i128_type)]
+#![cfg_attr(stage0, feature(i128_type))]
 #![feature(rustc_private)]
 #![feature(staged_api)]
 #![feature(lang_items)]

src/librustc/lib.rs

@@ -52,8 +52,7 @@
 #![feature(entry_or_default)]
 #![feature(from_ref)]
 #![feature(fs_read_write)]
-#![feature(i128)]
-#![feature(i128_type)]
+#![cfg_attr(stage0, feature(i128_type, i128))]
 #![cfg_attr(stage0, feature(inclusive_range_syntax))]
 #![cfg_attr(windows, feature(libc))]
 #![feature(match_default_bindings)]

src/librustc_apfloat/lib.rs

@@ -46,8 +46,8 @@
 #![deny(warnings)]
 #![forbid(unsafe_code)]
 
-#![feature(i128_type)]
 #![cfg_attr(stage0, feature(slice_patterns))]
+#![cfg_attr(stage0, feature(i128_type))]
 #![feature(try_from)]
 
 // See librustc_cratesio_shim/Cargo.toml for a comment explaining this.

src/librustc_apfloat/tests/ieee.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(i128_type)]
+#![cfg_attr(stage0, feature(i128_type))]
 
 #[macro_use]
 extern crate rustc_apfloat;

src/librustc_const_eval/lib.rs

@@ -23,7 +23,7 @@
 #![feature(box_patterns)]
 #![feature(box_syntax)]
 #![feature(macro_lifetime_matcher)]
-#![feature(i128_type)]
+#![cfg_attr(stage0, feature(i128_type))]
 #![feature(from_ref)]
 
 extern crate arena;

src/librustc_const_math/lib.rs

@@ -19,8 +19,7 @@
       html_root_url = "https://doc.rust-lang.org/nightly/")]
 #![deny(warnings)]
 
-#![feature(i128)]
-#![feature(i128_type)]
+#![cfg_attr(stage0, feature(i128_type, i128))]
 
 extern crate rustc_apfloat;
 

src/librustc_data_structures/lib.rs

@@ -26,8 +26,7 @@
 #![feature(unboxed_closures)]
 #![feature(fn_traits)]
 #![feature(unsize)]
-#![feature(i128_type)]
-#![feature(i128)]
+#![cfg_attr(stage0, feature(i128_type, i128))]
 #![feature(conservative_impl_trait)]
 #![feature(specialization)]
 #![feature(optin_builtin_traits)]

src/librustc_errors/lib.rs

@@ -18,7 +18,7 @@
 #![feature(range_contains)]
 #![cfg_attr(unix, feature(libc))]
 #![feature(conservative_impl_trait)]
-#![feature(i128_type)]
+#![cfg_attr(stage0, feature(i128_type))]
 #![feature(optin_builtin_traits)]
 
 extern crate atty;

src/librustc_incremental/lib.rs

@@ -17,7 +17,7 @@
 
 #![feature(conservative_impl_trait)]
 #![feature(fs_read_write)]
-#![feature(i128_type)]
+#![cfg_attr(stage0, feature(i128_type))]
 #![cfg_attr(stage0, feature(inclusive_range_syntax))]
 #![feature(specialization)]
 

src/librustc_lint/lib.rs

@@ -27,7 +27,7 @@
 #![cfg_attr(test, feature(test))]
 #![feature(box_patterns)]
 #![feature(box_syntax)]
-#![feature(i128_type)]
+#![cfg_attr(stage0, feature(i128_type))]
 #![feature(macro_vis_matcher)]
 #![feature(quote)]
 #![feature(rustc_diagnostic_macros)]

src/librustc_metadata/lib.rs

@@ -16,7 +16,7 @@
 #![feature(box_patterns)]
 #![feature(conservative_impl_trait)]
 #![feature(fs_read_write)]
-#![feature(i128_type)]
+#![cfg_attr(stage0, feature(i128_type))]
 #![feature(libc)]
 #![feature(macro_lifetime_matcher)]
 #![feature(proc_macro_internals)]

src/librustc_mir/lib.rs

@@ -27,7 +27,7 @@ Rust MIR: a lowered representation of Rust. Also: an experiment!
 #![feature(decl_macro)]
 #![feature(dyn_trait)]
 #![feature(fs_read_write)]
-#![feature(i128_type)]
+#![cfg_attr(stage0, feature(i128_type))]
 #![cfg_attr(stage0, feature(inclusive_range_syntax))]
 #![feature(macro_vis_matcher)]
 #![feature(match_default_bindings)]

src/librustc_resolve/lib.rs

@@ -57,7 +57,7 @@ use syntax::ast::{FnDecl, ForeignItem, ForeignItemKind, GenericParam, Generics};
 use syntax::ast::{Item, ItemKind, ImplItem, ImplItemKind};
 use syntax::ast::{Label, Local, Mutability, Pat, PatKind, Path};
 use syntax::ast::{QSelf, TraitItemKind, TraitRef, Ty, TyKind};
-use syntax::feature_gate::{feature_err, emit_feature_err, GateIssue};
+use syntax::feature_gate::{feature_err, GateIssue};
 use syntax::parse::token;
 use syntax::ptr::P;
 
@@ -3117,17 +3117,6 @@ impl<'a> Resolver<'a> {
                        self.primitive_type_table.primitive_types
                            .contains_key(&path[0].node.name) => {
                 let prim = self.primitive_type_table.primitive_types[&path[0].node.name];
-                match prim {
-                    TyUint(UintTy::U128) | TyInt(IntTy::I128) => {
-                        if !self.session.features_untracked().i128_type {
-                            emit_feature_err(&self.session.parse_sess,
-                                                "i128_type", span, GateIssue::Language,
-                                                "128-bit type is unstable");
-
-                        }
-                    }
-                    _ => {}
-                }
                 PathResolution::with_unresolved_segments(Def::PrimTy(prim), path.len() - 1)
             }
             PathResult::Module(module) => PathResolution::new(module.def().unwrap()),

src/librustc_trans/lib.rs

@@ -24,8 +24,7 @@
 #![feature(custom_attribute)]
 #![feature(fs_read_write)]
 #![allow(unused_attributes)]
-#![feature(i128_type)]
-#![feature(i128)]
+#![cfg_attr(stage0, feature(i128_type, i128))]
 #![cfg_attr(stage0, feature(inclusive_range_syntax))]
 #![feature(libc)]
 #![feature(quote)]

src/librustc_trans_utils/lib.rs

@@ -21,7 +21,7 @@
 #![feature(box_syntax)]
 #![feature(custom_attribute)]
 #![allow(unused_attributes)]
-#![feature(i128_type)]
+#![cfg_attr(stage0, feature(i128_type))]
 #![feature(quote)]
 #![feature(rustc_diagnostic_macros)]
 #![feature(conservative_impl_trait)]

src/librustc_typeck/lib.rs

@@ -86,7 +86,7 @@ This API is completely unstable and subject to change.
 #![feature(refcell_replace_swap)]
 #![feature(rustc_diagnostic_macros)]
 #![feature(slice_patterns)]
-#![feature(i128_type)]
+#![cfg_attr(stage0, feature(i128_type))]
 #![cfg_attr(stage0, feature(never_type))]
 
 #[macro_use] extern crate log;

src/libserialize/lib.rs

@@ -23,7 +23,7 @@ Core encoding and decoding interfaces.
 
 #![feature(box_syntax)]
 #![feature(core_intrinsics)]
-#![feature(i128_type)]
+#![cfg_attr(stage0, feature(i128_type))]
 #![feature(specialization)]
 #![cfg_attr(test, feature(test))]