Remove unused feature gates

Author: bjorn3

compiler/rustc_ast/src/lib.rs

@@ -12,13 +12,11 @@
 #![feature(box_patterns)]
 #![cfg_attr(bootstrap, feature(const_fn_unsize))]
 #![feature(const_fn_transmute)]
-#![feature(const_panic)]
 #![feature(crate_visibility_modifier)]
 #![feature(iter_zip)]
 #![feature(label_break_value)]
 #![feature(nll)]
 #![feature(min_specialization)]
-#![feature(trusted_step)]
 #![recursion_limit = "256"]
 
 #[macro_use]

compiler/rustc_ast_passes/src/lib.rs

@@ -6,7 +6,6 @@
 
 #![feature(bindings_after_at)]
 #![feature(iter_is_partitioned)]
-#![feature(box_syntax)]
 #![feature(box_patterns)]
 #![recursion_limit = "256"]
 

compiler/rustc_codegen_ssa/src/lib.rs

@@ -1,15 +1,11 @@
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
-#![feature(assert_matches)]
 #![feature(bool_to_option)]
 #![feature(box_patterns)]
-#![feature(drain_filter)]
 #![feature(try_blocks)]
 #![feature(in_band_lifetimes)]
 #![feature(nll)]
 #![feature(associated_type_bounds)]
-#![feature(iter_zip)]
 #![recursion_limit = "256"]
-#![feature(box_syntax)]
 
 //! This crate contains codegen code that is used by all codegen backends (LLVM and others).
 //! The backend-agnostic functions of this crate use functions defined in various traits that

compiler/rustc_data_structures/src/lib.rs

@@ -16,7 +16,6 @@
 #![feature(nll)]
 #![feature(allow_internal_unstable)]
 #![feature(hash_raw_entry)]
-#![feature(stmt_expr_attributes)]
 #![feature(core_intrinsics)]
 #![feature(test)]
 #![feature(associated_type_bounds)]

compiler/rustc_expand/src/lib.rs

@@ -1,4 +1,3 @@
-#![feature(bool_to_option)]
 #![feature(crate_visibility_modifier)]
 #![feature(decl_macro)]
 #![feature(destructuring_assignment)]

compiler/rustc_hir/src/lib.rs

@@ -3,12 +3,10 @@
 //! [rustc dev guide]: https://rustc-dev-guide.rust-lang.org/hir.html
 
 #![feature(crate_visibility_modifier)]
-#![feature(const_panic)]
 #![cfg_attr(bootstrap, feature(extended_key_value_attributes))]
 #![feature(in_band_lifetimes)]
 #![feature(once_cell)]
 #![feature(min_specialization)]
-#![feature(trusted_step)]
 #![recursion_limit = "256"]
 
 #[macro_use]

compiler/rustc_index/src/lib.rs

@@ -1,6 +1,5 @@
 #![feature(allow_internal_unstable)]
 #![feature(bench_black_box)]
-#![feature(const_panic)]
 #![feature(extend_one)]
 #![feature(iter_zip)]
 #![feature(unboxed_closures)]

compiler/rustc_infer/src/lib.rs

@@ -16,14 +16,12 @@
 #![feature(bool_to_option)]
 #![feature(box_patterns)]
 #![feature(box_syntax)]
-#![feature(const_panic)]
 #![feature(extend_one)]
 #![feature(iter_zip)]
 #![feature(never_type)]
 #![feature(in_band_lifetimes)]
 #![feature(control_flow_enum)]
 #![feature(min_specialization)]
-#![feature(trusted_step)]
 #![recursion_limit = "512"] // For rustdoc
 
 #[macro_use]

compiler/rustc_interface/src/lib.rs

@@ -1,6 +1,5 @@
 #![feature(bool_to_option)]
 #![feature(box_patterns)]
-#![feature(box_syntax)]
 #![feature(internal_output_capture)]
 #![feature(nll)]
 #![feature(generator_trait)]

compiler/rustc_lint/src/lib.rs

@@ -36,8 +36,6 @@
 #![feature(iter_zip)]
 #![feature(never_type)]
 #![feature(nll)]
-#![feature(half_open_range_patterns)]
-#![feature(exclusive_range_pattern)]
 #![feature(control_flow_enum)]
 #![recursion_limit = "256"]