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<ol class="chapter"><li class="affix"><a href="the-unstable-book.html">The Unstable Book</a></li><li><a href="compiler-flags.html"><strong aria-hidden="true">1.</strong> Compiler flags</a></li><li><ol class="section"><li><a href="compiler-flags/emit-stack-sizes.html"><strong aria-hidden="true">1.1.</strong> emit_stack_sizes</a></li><li><a href="compiler-flags/profile.html"><strong aria-hidden="true">1.2.</strong> profile</a></li></ol></li><li><a href="language-features.html"><strong aria-hidden="true">2.</strong> Language features</a></li><li><ol class="section"><li><a href="language-features/aarch64-target-feature.html"><strong aria-hidden="true">2.1.</strong> aarch64_target_feature</a></li><li><a href="language-features/abi-amdgpu-kernel.html"><strong aria-hidden="true">2.2.</strong> abi_amdgpu_kernel</a></li><li><a href="language-features/abi-msp430-interrupt.html"><strong aria-hidden="true">2.3.</strong> abi_msp430_interrupt</a></li><li><a href="language-features/abi-ptx.html"><strong aria-hidden="true">2.4.</strong> abi_ptx</a></li><li><a href="language-features/abi-thiscall.html"><strong aria-hidden="true">2.5.</strong> abi_thiscall</a></li><li><a href="language-features/abi-unadjusted.html"><strong aria-hidden="true">2.6.</strong> abi_unadjusted</a></li><li><a href="language-features/abi-vectorcall.html"><strong aria-hidden="true">2.7.</strong> abi_vectorcall</a></li><li><a href="language-features/abi-x86-interrupt.html"><strong aria-hidden="true">2.8.</strong> abi_x86_interrupt</a></li><li><a href="language-features/adx-target-feature.html"><strong aria-hidden="true">2.9.</strong> adx_target_feature</a></li><li><a href="language-features/alloc-error-handler.html"><strong aria-hidden="true">2.10.</strong> alloc_error_handler</a></li><li><a href="language-features/allocator-internals.html"><strong aria-hidden="true">2.11.</strong> allocator_internals</a></li><li><a href="language-features/allow-fail.html"><strong aria-hidden="true">2.12.</strong> allow_fail</a></li><li><a href="language-features/allow-internal-unsafe.html"><strong aria-hidden="true">2.13.</strong> allow_internal_unsafe</a></li><li><a href="language-features/allow-internal-unstable.html"><strong aria-hidden="true">2.14.</strong> allow_internal_unstable</a></li><li><a href="language-features/arbitrary-self-types.html"><strong aria-hidden="true">2.15.</strong> arbitrary_self_types</a></li><li><a href="language-features/arm-target-feature.html"><strong aria-hidden="true">2.16.</strong> arm_target_feature</a></li><li><a href="language-features/asm.html"><strong aria-hidden="true">2.17.</strong> asm</a></li><li><a href="language-features/associated-type-defaults.html"><strong aria-hidden="true">2.18.</strong> associated_type_defaults</a></li><li><a href="language-features/async-await.html"><strong aria-hidden="true">2.19.</strong> async_await</a></li><li><a href="language-features/avx512-target-feature.html"><strong aria-hidden="true">2.20.</strong> avx512_target_feature</a></li><li><a href="language-features/bind-by-move-pattern-guards.html"><strong aria-hidden="true">2.21.</strong> bind_by_move_pattern_guards</a></li><li><a href="language-features/box-patterns.html"><strong aria-hidden="true">2.22.</strong> box_patterns</a></li><li><a href="language-features/box-syntax.html"><strong aria-hidden="true">2.23.</strong> box_syntax</a></li><li><a href="language-features/c-variadic.html"><strong aria-hidden="true">2.24.</strong> c_variadic</a></li><li><a href="language-features/cfg-target-has-atomic.html"><strong aria-hidden="true">2.25.</strong> cfg_target_has_atomic</a></li><li><a href="language-features/cfg-target-thread-local.html"><strong aria-hidden="true">2.26.</strong> cfg_target_thread_local</a></li><li><a href="language-features/cmpxchg16b-target-feature.html"><strong aria-hidden="true">2.27.</strong> cmpxchg16b_target_feature</a></li><li><a href="language-features/compiler-builtins.html"><strong aria-hidden="true">2.28.</strong> compiler_builtins</a></li><li><a href="language-features/concat-idents.html"><strong aria-hidden="true">2.29.</strong> concat_idents</a></li><li><a href="language-features/const-compare-raw-pointers.html"><strong aria-hidden="true">2.30.</strong> const_compare_raw_pointers</a></li><li><a href="language-features/const-fn.html"><strong aria-hidden="true">2.31.</strong> const_fn</a></li><li><a href="language-features/const-fn-union.html"><strong aria-hidden="true">2.32.</strong> const_fn_union</a></li><li><a href="language-features/const-generics.html"><strong aria-hidden="true">2.33.</strong> const_generics</a></li><li><a href="language-features/const-panic.html"><strong aria-hidden="true">2.34.</strong> const_panic</a></li><li><a href="language-features/const-raw-ptr-deref.html"><strong aria-hidden="true">2.35.</strong> const_raw_ptr_deref</a></li><li><a href="language-features/const-raw-ptr-to-usize-cast.html"><strong aria-hidden="true">2.36.</strong> const_raw_ptr_to_usize_cast</a></li><li><a href="language-features/const-transmute.html"><strong aria-hidden="true">2.37.</strong> const_transmute</a></li><li><a href="language-features/crate-visibility-modifier.html"><strong aria-hidden="true">2.38.</strong> crate_visibility_modifier</a></li><li><a href="language-features/custom-attribute.html"><strong aria-hidden="true">2.39.</strong> custom_attribute</a></li><li><a href="language-features/custom-inner-attributes.html"><strong aria-hidden="true">2.40.</strong> custom_inner_attributes</a></li><li><a href="language-features/custom-test-frameworks.html"><strong aria-hidden="true">2.41.</strong> custom_test_frameworks</a></li><li><a href="language-features/decl-macro.html"><strong aria-hidden="true">2.42.</strong> decl_macro</a></li><li><a href="language-features/default-type-parameter-fallback.html"><strong aria-hidden="true">2.43.</strong> default_type_parameter_fallback</a></li><li><a href="language-features/doc-alias.html"><strong aria-hidden="true">2.44.</strong> doc_alias</a></li><li><a href="language-features/doc-cfg.html"><strong aria-hidden="true">2.45.</strong> doc_cfg</a></li><li><a href="language-features/doc-keyword.html"><strong aria-hidden="true">2.46.</strong> doc_keyword</a></li><li><a href="language-features/doc-masked.html"><strong aria-hidden="true">2.47.</strong> doc_masked</a></li><li><a href="language-features/doc-spotlight.html"><strong aria-hidden="true">2.48.</strong> doc_spotlight</a></li><li><a href="language-features/dropck-eyepatch.html"><strong aria-hidden="true">2.49.</strong> dropck_eyepatch</a></li><li><a href="language-features/dropck-parametricity.html"><strong aria-hidden="true">2.50.</strong> dropck_parametricity</a></li><li><a href="language-features/exclusive-range-pattern.html"><strong aria-hidden="true">2.51.</strong> exclusive_range_pattern</a></li><li><a href="language-features/exhaustive-patterns.html"><strong aria-hidden="true">2.52.</strong> exhaustive_patterns</a></li><li><a href="language-features/existential-type.html"><strong aria-hidden="true">2.53.</strong> existential_type</a></li><li><a href="language-features/extern-types.html"><strong aria-hidden="true">2.54.</strong> extern_types</a></li><li><a href="language-features/external-doc.html"><strong aria-hidden="true">2.55.</strong> external_doc</a></li><li><a href="language-features/ffi-returns-twice.html"><strong aria-hidden="true">2.56.</strong> ffi_returns_twice</a></li><li><a href="language-features/format-args-nl.html"><strong aria-hidden="true">2.57.</strong> format_args_nl</a></li><li><a href="language-features/fundamental.html"><strong aria-hidden="true">2.58.</strong> fundamental</a></li><li><a href="language-features/generators.html"><strong aria-hidden="true">2.59.</strong> generators</a></li><li><a href="language-features/generic-associated-types.html"><strong aria-hidden="true">2.60.</strong> generic_associated_types</a></li><li><a href="language-features/global-asm.html"><strong aria-hidden="true">2.61.</strong> global_asm</a></li><li><a href="language-features/hexagon-target-feature.html"><strong aria-hidden="true">2.62.</strong> hexagon_target_feature</a></li><li><a href="language-features/impl-trait-in-bindings.html"><strong aria-hidden="true">2.63.</strong> impl_trait_in_bindings</a></li><li><a href="language-features/in-band-lifetimes.html"><strong aria-hidden="true">2.64.</strong> in_band_lifetimes</a></li><li><a href="language-features/infer-static-outlives-requirements.html"><strong aria-hidden="true">2.65.</strong> infer_static_outlives_requirements</a></li><li><a href="language-features/intrinsics.html"><strong aria-hidden="true">2.66.</strong> intrinsics</a></li><li><a href="language-features/label-break-value.html"><strong aria-hidden="true">2.67.</strong> label_break_value</a></li><li><a href="language-features/lang-items.html"><strong aria-hidden="true">2.68.</strong> lang_items</a></li><li><a href="language-features/link-args.html"><strong aria-hidden="true">2.69.</strong> link_args</a></li><li><a href="language-features/link-cfg.html"><strong aria-hidden="true">2.70.</strong> link_cfg</a></li><li><a href="language-features/link-llvm-intrinsics.html"><strong aria-hidden="true">2.71.</strong> link_llvm_intrinsics</a></li><li><a href="language-features/linkage.html"><strong aria-hidden="true">2.72.</strong> linkage</a></li><li><a href="language-features/lint-reasons.html"><strong aria-hidden="true">2.73.</strong> lint_reasons</a></li><li><a href="language-features/log-syntax.html"><strong aria-hidden="true">2.74.</strong> log_syntax</a></li><li><a href="language-features/macros-in-extern.html"><strong aria-hidden="true">2.75.</strong> macros_in_extern</a></li><li><a href="language-features/main.html"><strong aria-hidden="true">2.76.</strong> main</a></li><li><a href="language-features/marker-trait-attr.html"><strong aria-hidden="true">2.77.</strong> marker_trait_attr</a></li><li><a href="language-features/mips-target-feature.html"><strong aria-hidden="true">2.78.</strong> mips_target_feature</a></li><li><a href="language-features/mmx-target-feature.html"><strong aria-hidden="true">2.79.</strong> mmx_target_feature</a></li><li><a href="language-features/movbe-target-feature.html"><strong aria-hidden="true">2.80.</strong> movbe_target_feature</a></li><li><a href="language-features/naked-functions.html"><strong aria-hidden="true">2.81.</strong> naked_functions</a></li><li><a href="language-features/needs-allocator.html"><strong aria-hidden="true">2.82.</strong> needs_allocator</a></li><li><a href="language-features/needs-panic-runtime.html"><strong aria-hidden="true">2.83.</strong> needs_panic_runtime</a></li><li><a href="language-features/never-type.html"><strong aria-hidden="true">2.84.</strong> never_type</a></li><li><a href="language-features/nll.html"><strong aria-hidden="true">2.85.</strong> nll</a></li><li><a href="language-features/no-core.html"><strong aria-hidden="true">2.86.</strong> no_core</a></li><li><a href="language-features/no-debug.html"><strong aria-hidden="true">2.87.</strong> no_debug</a></li><li><a href="language-features/non-ascii-idents.html"><strong aria-hidden="true">2.88.</strong> non_ascii_idents</a></li><li><a href="language-features/non-exhaustive.html"><strong aria-hidden="true">2.89.</strong> non_exhaustive</a></li><li><a href="language-features/omit-gdb-pretty-printer-section.html"><strong aria-hidden="true">2.90.</strong> omit_gdb_pretty_printer_section</a></li><li><a href="language-features/on-unimplemented.html"><strong aria-hidden="true">2.91.</strong> on_unimplemented</a></li><li><a href="language-features/optimize-attribute.html"><strong aria-hidden="true">2.92.</strong> optimize_attribute</a></li><li><a href="language-features/optin-builtin-traits.html"><strong aria-hidden="true">2.93.</strong> optin_builtin_traits</a></li><li><a href="language-features/overlapping-marker-traits.html"><strong aria-hidden="true">2.94.</strong> overlapping_marker_traits</a></li><li><a href="language-features/panic-runtime.html"><strong aria-hidden="true">2.95.</strong> panic_runtime</a></li><li><a href="language-features/platform-intrinsics.html"><strong aria-hidden="true">2.96.</strong> platform_intrinsics</a></li><li><a href="language-features/plugin.html"><strong aria-hidden="true">2.97.</strong> plugin</a></li><li><a href="language-features/plugin-registrar.html"><strong aria-hidden="true">2.98.</strong> plugin_registrar</a></li><li><a href="language-features/powerpc-target-feature.html"><strong aria-hidden="true">2.99.</strong> powerpc_target_feature</a></li><li><a href="language-features/precise-pointer-size-matching.html"><strong aria-hidden="true">2.100.</strong> precise_pointer_size_matching</a></li><li><a href="language-features/prelude-import.html"><strong aria-hidden="true">2.101.</strong> prelude_import</a></li><li><a href="language-features/proc-macro-hygiene.html"><strong aria-hidden="true">2.102.</strong> proc_macro_hygiene</a></li><li><a href="language-features/profiler-runtime.html"><strong aria-hidden="true">2.103.</strong> profiler_runtime</a></li><li><a href="language-features/re-rebalance-coherence.html"><strong aria-hidden="true">2.104.</strong> re_rebalance_coherence</a></li><li><a href="language-features/repr-align-enum.html"><strong aria-hidden="true">2.105.</strong> repr_align_enum</a></li><li><a href="language-features/repr-simd.html"><strong aria-hidden="true">2.106.</strong> repr_simd</a></li><li><a href="language-features/repr128.html"><strong aria-hidden="true">2.107.</strong> repr128</a></li><li><a href="language-features/rustc-attrs.html"><strong aria-hidden="true">2.108.</strong> rustc_attrs</a></li><li><a href="language-features/rustc-const-unstable.html"><strong aria-hidden="true">2.109.</strong> rustc_const_unstable</a></li><li><a href="language-features/rustc-diagnostic-macros.html" class="active"><strong aria-hidden="true">2.110.</strong> rustc_diagnostic_macros</a></li><li><a href="language-features/sanitizer-runtime.html"><strong aria-hidden="true">2.111.</strong> sanitizer_runtime</a></li><li><a href="language-features/simd-ffi.html"><strong aria-hidden="true">2.112.</strong> simd_ffi</a></li><li><a href="language-features/slice-patterns.html"><strong aria-hidden="true">2.113.</strong> slice_patterns</a></li><li><a href="language-features/specialization.html"><strong aria-hidden="true">2.114.</strong> specialization</a></li><li><a href="language-features/sse4a-target-feature.html"><strong aria-hidden="true">2.115.</strong> sse4a_target_feature</a></li><li><a href="language-features/staged-api.html"><strong aria-hidden="true">2.116.</strong> staged_api</a></li><li><a href="language-features/start.html"><strong aria-hidden="true">2.117.</strong> start</a></li><li><a href="language-features/static-nobundle.html"><strong aria-hidden="true">2.118.</strong> static_nobundle</a></li><li><a href="language-features/stmt-expr-attributes.html"><strong aria-hidden="true">2.119.</strong> stmt_expr_attributes</a></li><li><a href="language-features/structural-match.html"><strong aria-hidden="true">2.120.</strong> structural_match</a></li><li><a href="language-features/tbm-target-feature.html"><strong aria-hidden="true">2.121.</strong> tbm_target_feature</a></li><li><a href="language-features/test-2018-feature.html"><strong aria-hidden="true">2.122.</strong> test_2018_feature</a></li><li><a href="language-features/thread-local.html"><strong aria-hidden="true">2.123.</strong> thread_local</a></li><li><a href="language-features/trace-macros.html"><strong aria-hidden="true">2.124.</strong> trace_macros</a></li><li><a href="language-features/trait-alias.html"><strong aria-hidden="true">2.125.</strong> trait_alias</a></li><li><a href="language-features/trivial-bounds.html"><strong aria-hidden="true">2.126.</strong> trivial_bounds</a></li><li><a href="language-features/try-blocks.html"><strong aria-hidden="true">2.127.</strong> try_blocks</a></li><li><a href="language-features/type-alias-enum-variants.html"><strong aria-hidden="true">2.128.</strong> type_alias_enum_variants</a></li><li><a href="language-features/type-ascription.html"><strong aria-hidden="true">2.129.</strong> type_ascription</a></li><li><a href="language-features/unboxed-closures.html"><strong aria-hidden="true">2.130.</strong> unboxed_closures</a></li><li><a href="language-features/underscore-const-names.html"><strong aria-hidden="true">2.131.</strong> underscore_const_names</a></li><li><a href="language-features/unsized-locals.html"><strong aria-hidden="true">2.132.</strong> unsized_locals</a></li><li><a href="language-features/unsized-tuple-coercion.html"><strong aria-hidden="true">2.133.</strong> unsized_tuple_coercion</a></li><li><a href="language-features/untagged-unions.html"><strong aria-hidden="true">2.134.</strong> untagged_unions</a></li><li><a href="language-features/unwind-attributes.html"><strong aria-hidden="true">2.135.</strong> unwind_attributes</a></li><li><a href="language-features/wasm-target-feature.html"><strong aria-hidden="true">2.136.</strong> wasm_target_feature</a></li></ol></li><li><a href="library-features.html"><strong aria-hidden="true">3.</strong> Library Features</a></li><li><ol class="section"><li><a href="library-features/align-offset.html"><strong aria-hidden="true">3.1.</strong> align_offset</a></li><li><a href="library-features/alloc.html"><strong aria-hidden="true">3.2.</strong> alloc</a></li><li><a href="library-features/alloc-error-hook.html"><strong aria-hidden="true">3.3.</strong> alloc_error_hook</a></li><li><a href="library-features/alloc-internals.html"><strong aria-hidden="true">3.4.</strong> alloc_internals</a></li><li><a href="library-features/alloc-layout-extra.html"><strong aria-hidden="true">3.5.</strong> alloc_layout_extra</a></li><li><a href="library-features/alloc-prelude.html"><strong aria-hidden="true">3.6.</strong> alloc_prelude</a></li><li><a href="library-features/allocator-api.html"><strong aria-hidden="true">3.7.</strong> allocator_api</a></li><li><a href="library-features/array-error-internals.html"><strong aria-hidden="true">3.8.</strong> array_error_internals</a></li><li><a href="library-features/as-cell.html"><strong aria-hidden="true">3.9.</strong> as_cell</a></li><li><a href="library-features/atomic-min-max.html"><strong aria-hidden="true">3.10.</strong> atomic_min_max</a></li><li><a href="library-features/await-macro.html"><strong aria-hidden="true">3.11.</strong> await_macro</a></li><li><a href="library-features/box-into-pin.html"><strong aria-hidden="true">3.12.</strong> box_into_pin</a></li><li><a href="library-features/box-into-raw-non-null.html"><strong aria-hidden="true">3.13.</strong> box_into_raw_non_null</a></li><li><a href="library-features/bufreader-buffer.html"><strong aria-hidden="true">3.14.</strong> bufreader_buffer</a></li><li><a href="library-features/bufreader-seek-relative.html"><strong aria-hidden="true">3.15.</strong> bufreader_seek_relative</a></li><li><a href="library-features/c-void-variant.html"><strong aria-hidden="true">3.16.</strong> c_void_variant</a></li><li><a href="library-features/cell-update.html"><strong aria-hidden="true">3.17.</strong> cell_update</a></li><li><a href="library-features/char-error-internals.html"><strong aria-hidden="true">3.18.</strong> char_error_internals</a></li><li><a href="library-features/checked-duration-since.html"><strong aria-hidden="true">3.19.</strong> checked_duration_since</a></li><li><a href="library-features/clamp.html"><strong aria-hidden="true">3.20.</strong> clamp</a></li><li><a href="library-features/coerce-unsized.html"><strong aria-hidden="true">3.21.</strong> coerce_unsized</a></li><li><a href="library-features/compiler-builtins-lib.html"><strong aria-hidden="true">3.22.</strong> compiler_builtins_lib</a></li><li><a href="library-features/concat-idents-macro.html"><strong aria-hidden="true">3.23.</strong> concat_idents_macro</a></li><li><a href="library-features/const-cstr-unchecked.html"><strong aria-hidden="true">3.24.</strong> const_cstr_unchecked</a></li><li><a href="library-features/const-int-conversion.html"><strong aria-hidden="true">3.25.</strong> const_int_conversion</a></li><li><a href="library-features/const-needs-drop.html"><strong aria-hidden="true">3.26.</strong> const_needs_drop</a></li><li><a href="library-features/const-ptr-nonnull.html"><strong aria-hidden="true">3.27.</strong> const_ptr_nonnull</a></li><li><a href="library-features/const-saturating-int-methods.html"><strong aria-hidden="true">3.28.</strong> const_saturating_int_methods</a></li><li><a href="library-features/const-slice-len.html"><strong aria-hidden="true">3.29.</strong> const_slice_len</a></li><li><a href="library-features/const-str-as-bytes.html"><strong aria-hidden="true">3.30.</strong> const_str_as_bytes</a></li><li><a href="library-features/const-str-len.html"><strong aria-hidden="true">3.31.</strong> const_str_len</a></li><li><a href="library-features/const-string-new.html"><strong aria-hidden="true">3.32.</strong> const_string_new</a></li><li><a href="library-features/const-type-id.html"><strong aria-hidden="true">3.33.</strong> const_type_id</a></li><li><a href="library-features/const-vec-new.html"><strong aria-hidden="true">3.34.</strong> const_vec_new</a></li><li><a href="library-features/copy-within.html"><strong aria-hidden="true">3.35.</strong> copy_within</a></li><li><a href="library-features/core-intrinsics.html"><strong aria-hidden="true">3.36.</strong> core_intrinsics</a></li><li><a href="library-features/core-panic.html"><strong aria-hidden="true">3.37.</strong> core_panic</a></li><li><a href="library-features/core-panic-info.html"><strong aria-hidden="true">3.38.</strong> core_panic_info</a></li><li><a href="library-features/core-private-bignum.html"><strong aria-hidden="true">3.39.</strong> core_private_bignum</a></li><li><a href="library-features/core-private-diy-float.html"><strong aria-hidden="true">3.40.</strong> core_private_diy_float</a></li><li><a href="library-features/deadline-api.html"><strong aria-hidden="true">3.41.</strong> deadline_api</a></li><li><a href="library-features/dec2flt.html"><strong aria-hidden="true">3.42.</strong> dec2flt</a></li><li><a href="library-features/derive-clone-copy.html"><strong aria-hidden="true">3.43.</strong> derive_clone_copy</a></li><li><a href="library-features/derive-eq.html"><strong aria-hidden="true">3.44.</strong> derive_eq</a></li><li><a href="library-features/dispatch-from-dyn.html"><strong aria-hidden="true">3.45.</strong> dispatch_from_dyn</a></li><li><a href="library-features/drain-filter.html"><strong aria-hidden="true">3.46.</strong> drain_filter</a></li><li><a href="library-features/duration-constants.html"><strong aria-hidden="true">3.47.</strong> duration_constants</a></li><li><a href="library-features/duration-float.html"><strong aria-hidden="true">3.48.</strong> duration_float</a></li><li><a href="library-features/error-iter.html"><strong aria-hidden="true">3.49.</strong> error_iter</a></li><li><a href="library-features/error-type-id.html"><strong aria-hidden="true">3.50.</strong> error_type_id</a></li><li><a href="library-features/euclidean-division.html"><strong aria-hidden="true">3.51.</strong> euclidean_division</a></li><li><a href="library-features/exact-size-is-empty.html"><strong aria-hidden="true">3.52.</strong> exact_size_is_empty</a></li><li><a href="library-features/extra-log-consts.html"><strong aria-hidden="true">3.53.</strong> extra_log_consts</a></li><li><a href="library-features/fd.html"><strong aria-hidden="true">3.54.</strong> fd</a></li><li><a href="library-features/fd-read.html"><strong aria-hidden="true">3.55.</strong> fd_read</a></li><li><a href="library-features/fixed-size-array.html"><strong aria-hidden="true">3.56.</strong> fixed_size_array</a></li><li><a href="library-features/flt2dec.html"><strong aria-hidden="true">3.57.</strong> flt2dec</a></li><li><a href="library-features/fmt-internals.html"><strong aria-hidden="true">3.58.</strong> fmt_internals</a></li><li><a href="library-features/fn-traits.html"><strong aria-hidden="true">3.59.</strong> fn_traits</a></li><li><a href="library-features/fnbox.html"><strong aria-hidden="true">3.60.</strong> fnbox</a></li><li><a href="library-features/forget-unsized.html"><strong aria-hidden="true">3.61.</strong> forget_unsized</a></li><li><a href="library-features/futures-api.html"><strong aria-hidden="true">3.62.</strong> futures_api</a></li><li><a href="library-features/gen-future.html"><strong aria-hidden="true">3.63.</strong> gen_future</a></li><li><a href="library-features/generator-trait.html"><strong aria-hidden="true">3.64.</strong> generator_trait</a></li><li><a href="library-features/hash-raw-entry.html"><strong aria-hidden="true">3.65.</strong> hash_raw_entry</a></li><li><a href="library-features/hashmap-internals.html"><strong aria-hidden="true">3.66.</strong> hashmap_internals</a></li><li><a href="library-features/inner-deref.html"><strong aria-hidden="true">3.67.</strong> inner_deref</a></li><li><a href="library-features/int-error-internals.html"><strong aria-hidden="true">3.68.</strong> int_error_internals</a></li><li><a href="library-features/int-error-matching.html"><strong aria-hidden="true">3.69.</strong> int_error_matching</a></li><li><a href="library-features/integer-atomics.html"><strong aria-hidden="true">3.70.</strong> integer_atomics</a></li><li><a href="library-features/iovec.html"><strong aria-hidden="true">3.71.</strong> iovec</a></li><li><a href="library-features/ip.html"><strong aria-hidden="true">3.72.</strong> ip</a></li><li><a href="library-features/is-sorted.html"><strong aria-hidden="true">3.73.</strong> is_sorted</a></li><li><a href="library-features/iter-copied.html"><strong aria-hidden="true">3.74.</strong> iter_copied</a></li><li><a href="library-features/iter-nth-back.html"><strong aria-hidden="true">3.75.</strong> iter_nth_back</a></li><li><a href="library-features/iter-once-with.html"><strong aria-hidden="true">3.76.</strong> iter_once_with</a></li><li><a href="library-features/libstd-io-internals.html"><strong aria-hidden="true">3.77.</strong> libstd_io_internals</a></li><li><a href="library-features/libstd-sys-internals.html"><strong aria-hidden="true">3.78.</strong> libstd_sys_internals</a></li><li><a href="library-features/libstd-thread-internals.html"><strong aria-hidden="true">3.79.</strong> libstd_thread_internals</a></li><li><a href="library-features/linked-list-extras.html"><strong aria-hidden="true">3.80.</strong> linked_list_extras</a></li><li><a href="library-features/manually-drop-take.html"><strong aria-hidden="true">3.81.</strong> manually_drop_take</a></li><li><a href="library-features/map-entry-replace.html"><strong aria-hidden="true">3.82.</strong> map_entry_replace</a></li><li><a href="library-features/map-get-key-value.html"><strong aria-hidden="true">3.83.</strong> map_get_key_value</a></li><li><a href="library-features/maybe-uninit.html"><strong aria-hidden="true">3.84.</strong> maybe_uninit</a></li><li><a href="library-features/maybe-uninit-array.html"><strong aria-hidden="true">3.85.</strong> maybe_uninit_array</a></li><li><a href="library-features/maybe-uninit-ref.html"><strong aria-hidden="true">3.86.</strong> maybe_uninit_ref</a></li><li><a href="library-features/maybe-uninit-slice.html"><strong aria-hidden="true">3.87.</strong> maybe_uninit_slice</a></li><li><a href="library-features/mpsc-select.html"><strong aria-hidden="true">3.88.</strong> mpsc_select</a></li><li><a href="library-features/n16.html"><strong aria-hidden="true">3.89.</strong> n16</a></li><li><a href="library-features/no-more-cas.html"><strong aria-hidden="true">3.90.</strong> no_more_cas</a></li><li><a href="library-features/once-is-completed.html"><strong aria-hidden="true">3.91.</strong> once_is_completed</a></li><li><a href="library-features/once-poison.html"><strong aria-hidden="true">3.92.</strong> once_poison</a></li><li><a href="library-features/option-xor.html"><strong aria-hidden="true">3.93.</strong> option_xor</a></li><li><a href="library-features/panic-abort.html"><strong aria-hidden="true">3.94.</strong> panic_abort</a></li><li><a href="library-features/panic-info-message.html"><strong aria-hidden="true">3.95.</strong> panic_info_message</a></li><li><a href="library-features/panic-internals.html"><strong aria-hidden="true">3.96.</strong> panic_internals</a></li><li><a href="library-features/panic-unwind.html"><strong aria-hidden="true">3.97.</strong> panic_unwind</a></li><li><a href="library-features/path-buf-capacity.html"><strong aria-hidden="true">3.98.</strong> path_buf_capacity</a></li><li><a href="library-features/pattern.html"><strong aria-hidden="true">3.99.</strong> pattern</a></li><li><a href="library-features/print-internals.html"><strong aria-hidden="true">3.100.</strong> print_internals</a></li><li><a href="library-features/proc-macro-def-site.html"><strong aria-hidden="true">3.101.</strong> proc_macro_def_site</a></li><li><a href="library-features/proc-macro-diagnostic.html"><strong aria-hidden="true">3.102.</strong> proc_macro_diagnostic</a></li><li><a href="library-features/proc-macro-internals.html"><strong aria-hidden="true">3.103.</strong> proc_macro_internals</a></li><li><a href="library-features/proc-macro-quote.html"><strong aria-hidden="true">3.104.</strong> proc_macro_quote</a></li><li><a href="library-features/proc-macro-raw-ident.html"><strong aria-hidden="true">3.105.</strong> proc_macro_raw_ident</a></li><li><a href="library-features/proc-macro-span.html"><strong aria-hidden="true">3.106.</strong> proc_macro_span</a></li><li><a href="library-features/process-exitcode-placeholder.html"><strong aria-hidden="true">3.107.</strong> process_exitcode_placeholder</a></li><li><a href="library-features/process-internals.html"><strong aria-hidden="true">3.108.</strong> process_internals</a></li><li><a href="library-features/profiler-runtime-lib.html"><strong aria-hidden="true">3.109.</strong> profiler_runtime_lib</a></li><li><a href="library-features/ptr-internals.html"><strong aria-hidden="true">3.110.</strong> ptr_internals</a></li><li><a href="library-features/ptr-offset-from.html"><strong aria-hidden="true">3.111.</strong> ptr_offset_from</a></li><li><a href="library-features/ptr-wrapping-offset-from.html"><strong aria-hidden="true">3.112.</strong> ptr_wrapping_offset_from</a></li><li><a href="library-features/range-is-empty.html"><strong aria-hidden="true">3.113.</strong> range_is_empty</a></li><li><a href="library-features/raw.html"><strong aria-hidden="true">3.114.</strong> raw</a></li><li><a href="library-features/raw-vec-internals.html"><strong aria-hidden="true">3.115.</strong> raw_vec_internals</a></li><li><a href="library-features/rc-into-raw-non-null.html"><strong aria-hidden="true">3.116.</strong> rc_into_raw_non_null</a></li><li><a href="library-features/read-initializer.html"><strong aria-hidden="true">3.117.</strong> read_initializer</a></li><li><a href="library-features/receiver-trait.html"><strong aria-hidden="true">3.118.</strong> receiver_trait</a></li><li><a href="library-features/renamed-spin-loop.html"><strong aria-hidden="true">3.119.</strong> renamed_spin_loop</a></li><li><a href="library-features/repeat-generic-slice.html"><strong aria-hidden="true">3.120.</strong> repeat_generic_slice</a></li><li><a href="library-features/result-map-or-else.html"><strong aria-hidden="true">3.121.</strong> result_map_or_else</a></li><li><a href="library-features/reverse-bits.html"><strong aria-hidden="true">3.122.</strong> reverse_bits</a></li><li><a href="library-features/rt.html"><strong aria-hidden="true">3.123.</strong> rt</a></li><li><a href="library-features/rustc-private.html"><strong aria-hidden="true">3.124.</strong> rustc_private</a></li><li><a href="library-features/sanitizer-runtime-lib.html"><strong aria-hidden="true">3.125.</strong> sanitizer_runtime_lib</a></li><li><a href="library-features/seek-convenience.html"><strong aria-hidden="true">3.126.</strong> seek_convenience</a></li><li><a href="library-features/set-stdio.html"><strong aria-hidden="true">3.127.</strong> set_stdio</a></li><li><a href="library-features/sgx-platform.html"><strong aria-hidden="true">3.128.</strong> sgx_platform</a></li><li><a href="library-features/shrink-to.html"><strong aria-hidden="true">3.129.</strong> shrink_to</a></li><li><a href="library-features/slice-concat-ext.html"><strong aria-hidden="true">3.130.</strong> slice_concat_ext</a></li><li><a href="library-features/slice-index-methods.html"><strong aria-hidden="true">3.131.</strong> slice_index_methods</a></li><li><a href="library-features/slice-internals.html"><strong aria-hidden="true">3.132.</strong> slice_internals</a></li><li><a href="library-features/slice-iter-mut-as-slice.html"><strong aria-hidden="true">3.133.</strong> slice_iter_mut_as_slice</a></li><li><a href="library-features/slice-partition-at-index.html"><strong aria-hidden="true">3.134.</strong> slice_partition_at_index</a></li><li><a href="library-features/slice-partition-dedup.html"><strong aria-hidden="true">3.135.</strong> slice_partition_dedup</a></li><li><a href="library-features/sort-internals.html"><strong aria-hidden="true">3.136.</strong> sort_internals</a></li><li><a href="library-features/std-internals.html"><strong aria-hidden="true">3.137.</strong> std_internals</a></li><li><a href="library-features/stdsimd.html"><strong aria-hidden="true">3.138.</strong> stdsimd</a></li><li><a href="library-features/step-trait.html"><strong aria-hidden="true">3.139.</strong> step_trait</a></li><li><a href="library-features/str-as-mut-ptr.html"><strong aria-hidden="true">3.140.</strong> str_as_mut_ptr</a></li><li><a href="library-features/str-internals.html"><strong aria-hidden="true">3.141.</strong> str_internals</a></li><li><a href="library-features/termination-trait-lib.html"><strong aria-hidden="true">3.142.</strong> termination_trait_lib</a></li><li><a href="library-features/test.html"><strong aria-hidden="true">3.143.</strong> test</a></li><li><a href="library-features/thread-local-internals.html"><strong aria-hidden="true">3.144.</strong> thread_local_internals</a></li><li><a href="library-features/thread-spawn-unchecked.html"><strong aria-hidden="true">3.145.</strong> thread_spawn_unchecked</a></li><li><a href="library-features/todo-macro.html"><strong aria-hidden="true">3.146.</strong> todo_macro</a></li><li><a href="library-features/toowned-clone-into.html"><strong aria-hidden="true">3.147.</strong> toowned_clone_into</a></li><li><a href="library-features/trusted-len.html"><strong aria-hidden="true">3.148.</strong> trusted_len</a></li><li><a href="library-features/try-reserve.html"><strong aria-hidden="true">3.149.</strong> try_reserve</a></li><li><a href="library-features/try-trait.html"><strong aria-hidden="true">3.150.</strong> try_trait</a></li><li><a href="library-features/udp-peer-addr.html"><strong aria-hidden="true">3.151.</strong> udp_peer_addr</a></li><li><a href="library-features/unicode-internals.html"><strong aria-hidden="true">3.152.</strong> unicode_internals</a></li><li><a href="library-features/unicode-version.html"><strong aria-hidden="true">3.153.</strong> unicode_version</a></li><li><a href="library-features/unsize.html"><strong aria-hidden="true">3.154.</strong> unsize</a></li><li><a href="library-features/update-panic-count.html"><strong aria-hidden="true">3.155.</strong> update_panic_count</a></li><li><a href="library-features/vec-drain-as-slice.html"><strong aria-hidden="true">3.156.</strong> vec_drain_as_slice</a></li><li><a href="library-features/vec-remove-item.html"><strong aria-hidden="true">3.157.</strong> vec_remove_item</a></li><li><a href="library-features/vec-resize-default.html"><strong aria-hidden="true">3.158.</strong> vec_resize_default</a></li><li><a href="library-features/vecdeque-rotate.html"><strong aria-hidden="true">3.159.</strong> vecdeque_rotate</a></li><li><a href="library-features/wait-timeout-until.html"><strong aria-hidden="true">3.160.</strong> wait_timeout_until</a></li><li><a href="library-features/wait-until.html"><strong aria-hidden="true">3.161.</strong> wait_until</a></li><li><a href="library-features/wasi-ext.html"><strong aria-hidden="true">3.162.</strong> wasi_ext</a></li><li><a href="library-features/weak-counts.html"><strong aria-hidden="true">3.163.</strong> weak_counts</a></li><li><a href="library-features/weak-ptr-eq.html"><strong aria-hidden="true">3.164.</strong> weak_ptr_eq</a></li><li><a href="library-features/windows-c.html"><strong aria-hidden="true">3.165.</strong> windows_c</a></li><li><a href="library-features/windows-file-type-ext.html"><strong aria-hidden="true">3.166.</strong> windows_file_type_ext</a></li><li><a href="library-features/windows-handle.html"><strong aria-hidden="true">3.167.</strong> windows_handle</a></li><li><a href="library-features/windows-net.html"><strong aria-hidden="true">3.168.</strong> windows_net</a></li><li><a href="library-features/windows-stdio.html"><strong aria-hidden="true">3.169.</strong> windows_stdio</a></li><li><a href="library-features/wrapping-int-impl.html"><strong aria-hidden="true">3.170.</strong> wrapping_int_impl</a></li><li><a href="library-features/wrapping-next-power-of-two.html"><strong 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<a class="header" href="language-features/rustc-diagnostic-macros.html#rustc_diagnostic_macros" id="rustc_diagnostic_macros"><h1><code>rustc_diagnostic_macros</code></h1></a>
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