Remove redundant #![feature(...)] 's from compiler/

compiler/rustc_ast/src/lib.rs

@@ -5,17 +5,13 @@
 //! This API is completely unstable and subject to change.
 
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/", test(attr(deny(warnings))))]
-#![feature(bool_to_option)]
 #![feature(box_syntax)]
 #![feature(const_fn)] // For the `transmute` in `P::new`
 #![feature(const_panic)]
-#![feature(const_fn_transmute)]
 #![feature(crate_visibility_modifier)]
 #![feature(label_break_value)]
 #![feature(nll)]
 #![feature(or_patterns)]
-#![feature(try_trait)]
-#![feature(unicode_internals)]
 #![recursion_limit = "256"]
 
 #[macro_use]

compiler/rustc_codegen_ssa/src/lib.rs

@@ -8,8 +8,6 @@
 #![feature(or_patterns)]
 #![feature(trusted_len)]
 #![feature(associated_type_bounds)]
-#![feature(const_fn)] // for rustc_index::newtype_index
-#![feature(const_panic)] // for rustc_index::newtype_index
 #![recursion_limit = "256"]
 
 //! This crate contains codegen code that is used by all codegen backends (LLVM and others).

compiler/rustc_data_structures/src/lib.rs

@@ -11,7 +11,6 @@
 #![feature(control_flow_enum)]
 #![feature(in_band_lifetimes)]
 #![feature(unboxed_closures)]
-#![feature(generators)]
 #![feature(generator_trait)]
 #![feature(fn_traits)]
 #![feature(min_specialization)]

compiler/rustc_expand/src/lib.rs

@@ -1,5 +1,4 @@
 #![feature(bool_to_option)]
-#![feature(cow_is_borrowed)]
 #![feature(crate_visibility_modifier)]
 #![feature(decl_macro)]
 #![feature(or_patterns)]

compiler/rustc_infer/src/lib.rs

@@ -13,7 +13,6 @@
 //! This API is completely unstable and subject to change.
 
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
-#![feature(bindings_after_at)]
 #![feature(bool_to_option)]
 #![feature(box_patterns)]
 #![feature(box_syntax)]
@@ -23,7 +22,6 @@
 #![feature(never_type)]
 #![feature(or_patterns)]
 #![feature(in_band_lifetimes)]
-#![feature(crate_visibility_modifier)]
 #![recursion_limit = "512"] // For rustdoc
 
 #[macro_use]

compiler/rustc_middle/src/lib.rs

@@ -30,26 +30,21 @@
 #![feature(cmp_min_max_by)]
 #![feature(const_fn)]
 #![feature(const_panic)]
-#![feature(const_fn_transmute)]
 #![feature(core_intrinsics)]
 #![feature(discriminant_kind)]
-#![feature(drain_filter)]
 #![feature(never_type)]
-#![feature(exhaustive_patterns)]
 #![feature(extern_types)]
 #![feature(nll)]
 #![feature(once_cell)]
 #![feature(option_expect_none)]
 #![feature(or_patterns)]
 #![feature(min_specialization)]
 #![feature(trusted_len)]
-#![feature(stmt_expr_attributes)]
 #![feature(test)]
 #![feature(in_band_lifetimes)]
 #![feature(crate_visibility_modifier)]
 #![feature(associated_type_bounds)]
 #![feature(rustc_attrs)]
-#![feature(hash_raw_entry)]
 #![feature(int_error_matching)]
 #![recursion_limit = "512"]
 

compiler/rustc_mir/src/lib.rs

@@ -13,15 +13,12 @@ Rust MIR: a lowered representation of Rust.
 #![feature(const_panic)]
 #![feature(crate_visibility_modifier)]
 #![feature(decl_macro)]
-#![feature(drain_filter)]
 #![feature(exact_size_is_empty)]
 #![feature(exhaustive_patterns)]
-#![feature(iter_order_by)]
 #![feature(never_type)]
 #![feature(min_specialization)]
 #![feature(trusted_len)]
 #![feature(try_blocks)]
-#![feature(associated_type_bounds)]
 #![feature(associated_type_defaults)]
 #![feature(stmt_expr_attributes)]
 #![feature(trait_alias)]

compiler/rustc_parse/src/lib.rs

@@ -3,7 +3,6 @@
 #![feature(bool_to_option)]
 #![feature(crate_visibility_modifier)]
 #![feature(bindings_after_at)]
-#![feature(try_blocks)]
 #![feature(or_patterns)]
 
 use rustc_ast as ast;

compiler/rustc_parse_format/src/lib.rs

@@ -11,8 +11,6 @@
 )]
 #![feature(nll)]
 #![feature(or_patterns)]
-#![feature(rustc_private)]
-#![feature(unicode_internals)]
 #![feature(bool_to_option)]
 
 pub use Alignment::*;

compiler/rustc_privacy/src/lib.rs

@@ -1,7 +1,6 @@
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
 #![feature(in_band_lifetimes)]
 #![feature(nll)]
-#![feature(or_patterns)]
 #![recursion_limit = "256"]
 
 use rustc_attr as attr;

compiler/rustc_span/src/lib.rs

@@ -10,10 +10,8 @@
 #![feature(const_panic)]
 #![feature(negative_impls)]
 #![feature(nll)]
-#![feature(optin_builtin_traits)]
 #![feature(min_specialization)]
 #![feature(option_expect_none)]
-#![feature(refcell_take)]
 
 #[macro_use]
 extern crate rustc_macros;

compiler/rustc_traits/src/lib.rs

@@ -4,7 +4,6 @@
 #![feature(crate_visibility_modifier)]
 #![feature(in_band_lifetimes)]
 #![feature(nll)]
-#![feature(or_patterns)]
 #![recursion_limit = "256"]
 
 #[macro_use]

compiler/rustc_ty/src/lib.rs

@@ -5,7 +5,6 @@
 //! This API is completely unstable and subject to change.
 
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
-#![feature(bool_to_option)]
 #![feature(nll)]
 #![recursion_limit = "256"]