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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/linker-flavor.html"><strong aria-hidden="true">1.1.</strong> linker_flavor</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-msp430-interrupt.html"><strong aria-hidden="true">2.2.</strong> abi_msp430_interrupt</a></li><li><a href="language-features/abi-ptx.html"><strong aria-hidden="true">2.3.</strong> abi_ptx</a></li><li><a href="language-features/abi-thiscall.html"><strong aria-hidden="true">2.4.</strong> abi_thiscall</a></li><li><a href="language-features/abi-unadjusted.html"><strong aria-hidden="true">2.5.</strong> abi_unadjusted</a></li><li><a href="language-features/abi-vectorcall.html"><strong aria-hidden="true">2.6.</strong> abi_vectorcall</a></li><li><a href="language-features/abi-x86-interrupt.html"><strong aria-hidden="true">2.7.</strong> abi_x86_interrupt</a></li><li><a href="language-features/allocator-internals.html"><strong aria-hidden="true">2.8.</strong> allocator_internals</a></li><li><a href="language-features/allow-fail.html"><strong aria-hidden="true">2.9.</strong> allow_fail</a></li><li><a href="language-features/allow-internal-unsafe.html"><strong aria-hidden="true">2.10.</strong> allow_internal_unsafe</a></li><li><a href="language-features/allow-internal-unstable.html"><strong aria-hidden="true">2.11.</strong> allow_internal_unstable</a></li><li><a href="language-features/arbitrary-self-types.html"><strong aria-hidden="true">2.12.</strong> arbitrary_self_types</a></li><li><a href="language-features/arm-target-feature.html"><strong aria-hidden="true">2.13.</strong> arm_target_feature</a></li><li><a href="language-features/asm.html"><strong aria-hidden="true">2.14.</strong> asm</a></li><li><a href="language-features/associated-type-defaults.html"><strong aria-hidden="true">2.15.</strong> associated_type_defaults</a></li><li><a href="language-features/attr-literals.html"><strong aria-hidden="true">2.16.</strong> attr_literals</a></li><li><a href="language-features/avx512-target-feature.html"><strong aria-hidden="true">2.17.</strong> avx512_target_feature</a></li><li><a href="language-features/box-patterns.html"><strong aria-hidden="true">2.18.</strong> box_patterns</a></li><li><a href="language-features/box-syntax.html"><strong aria-hidden="true">2.19.</strong> box_syntax</a></li><li><a href="language-features/catch-expr.html"><strong aria-hidden="true">2.20.</strong> catch_expr</a></li><li><a href="language-features/cfg-target-has-atomic.html"><strong aria-hidden="true">2.21.</strong> cfg_target_has_atomic</a></li><li><a href="language-features/cfg-target-thread-local.html"><strong aria-hidden="true">2.22.</strong> cfg_target_thread_local</a></li><li><a href="language-features/cfg-target-vendor.html"><strong aria-hidden="true">2.23.</strong> cfg_target_vendor</a></li><li><a href="language-features/compiler-builtins.html"><strong aria-hidden="true">2.24.</strong> compiler_builtins</a></li><li><a href="language-features/concat-idents.html"><strong aria-hidden="true">2.25.</strong> concat_idents</a></li><li><a href="language-features/const-fn.html"><strong aria-hidden="true">2.26.</strong> const_fn</a></li><li><a href="language-features/const-let.html"><strong aria-hidden="true">2.27.</strong> const_let</a></li><li><a href="language-features/crate-in-paths.html"><strong aria-hidden="true">2.28.</strong> crate_in_paths</a></li><li><a href="language-features/crate-visibility-modifier.html"><strong aria-hidden="true">2.29.</strong> crate_visibility_modifier</a></li><li><a href="language-features/custom-attribute.html"><strong aria-hidden="true">2.30.</strong> custom_attribute</a></li><li><a href="language-features/custom-derive.html"><strong aria-hidden="true">2.31.</strong> custom_derive</a></li><li><a href="language-features/decl-macro.html"><strong aria-hidden="true">2.32.</strong> decl_macro</a></li><li><a href="language-features/default-type-parameter-fallback.html"><strong aria-hidden="true">2.33.</strong> default_type_parameter_fallback</a></li><li><a href="language-features/doc-alias.html"><strong aria-hidden="true">2.34.</strong> doc_alias</a></li><li><a href="language-features/doc-cfg.html"><strong aria-hidden="true">2.35.</strong> doc_cfg</a></li><li><a href="language-features/doc-keyword.html"><strong aria-hidden="true">2.36.</strong> doc_keyword</a></li><li><a href="language-features/doc-masked.html"><strong aria-hidden="true">2.37.</strong> doc_masked</a></li><li><a href="language-features/doc-spotlight.html"><strong aria-hidden="true">2.38.</strong> doc_spotlight</a></li><li><a href="language-features/dropck-eyepatch.html"><strong aria-hidden="true">2.39.</strong> dropck_eyepatch</a></li><li><a href="language-features/dropck-parametricity.html"><strong aria-hidden="true">2.40.</strong> dropck_parametricity</a></li><li><a href="language-features/exclusive-range-pattern.html"><strong aria-hidden="true">2.41.</strong> exclusive_range_pattern</a></li><li><a href="language-features/exhaustive-patterns.html"><strong aria-hidden="true">2.42.</strong> exhaustive_patterns</a></li><li><a href="language-features/extern-absolute-paths.html"><strong aria-hidden="true">2.43.</strong> extern_absolute_paths</a></li><li><a href="language-features/extern-in-paths.html"><strong aria-hidden="true">2.44.</strong> extern_in_paths</a></li><li><a href="language-features/extern-prelude.html"><strong aria-hidden="true">2.45.</strong> extern_prelude</a></li><li><a href="language-features/extern-types.html"><strong aria-hidden="true">2.46.</strong> extern_types</a></li><li><a href="language-features/external-doc.html"><strong aria-hidden="true">2.47.</strong> external_doc</a></li><li><a href="language-features/fundamental.html"><strong aria-hidden="true">2.48.</strong> fundamental</a></li><li><a href="language-features/generators.html"><strong aria-hidden="true">2.49.</strong> generators</a></li><li><a href="language-features/generic-associated-types.html"><strong aria-hidden="true">2.50.</strong> generic_associated_types</a></li><li><a href="language-features/global-asm.html"><strong aria-hidden="true">2.51.</strong> global_asm</a></li><li><a href="language-features/hexagon-target-feature.html"><strong aria-hidden="true">2.52.</strong> hexagon_target_feature</a></li><li><a href="language-features/if-while-or-patterns.html"><strong aria-hidden="true">2.53.</strong> if_while_or_patterns</a></li><li><a href="language-features/in-band-lifetimes.html"><strong aria-hidden="true">2.54.</strong> in_band_lifetimes</a></li><li><a href="language-features/infer-outlives-requirements.html"><strong aria-hidden="true">2.55.</strong> infer_outlives_requirements</a></li><li><a href="language-features/intrinsics.html" class="active"><strong aria-hidden="true">2.56.</strong> intrinsics</a></li><li><a href="language-features/label-break-value.html"><strong aria-hidden="true">2.57.</strong> label_break_value</a></li><li><a href="language-features/lang-items.html"><strong aria-hidden="true">2.58.</strong> lang_items</a></li><li><a href="language-features/link-args.html"><strong aria-hidden="true">2.59.</strong> link_args</a></li><li><a href="language-features/link-cfg.html"><strong aria-hidden="true">2.60.</strong> link_cfg</a></li><li><a href="language-features/link-llvm-intrinsics.html"><strong aria-hidden="true">2.61.</strong> link_llvm_intrinsics</a></li><li><a href="language-features/linkage.html"><strong aria-hidden="true">2.62.</strong> linkage</a></li><li><a href="language-features/log-syntax.html"><strong aria-hidden="true">2.63.</strong> log_syntax</a></li><li><a href="language-features/macro-at-most-once-rep.html"><strong aria-hidden="true">2.64.</strong> macro_at_most_once_rep</a></li><li><a href="language-features/macro-literal-matcher.html"><strong aria-hidden="true">2.65.</strong> macro_literal_matcher</a></li><li><a href="language-features/macro-vis-matcher.html"><strong aria-hidden="true">2.66.</strong> macro_vis_matcher</a></li><li><a href="language-features/macros-in-extern.html"><strong aria-hidden="true">2.67.</strong> macros_in_extern</a></li><li><a href="language-features/main.html"><strong aria-hidden="true">2.68.</strong> main</a></li><li><a href="language-features/mips-target-feature.html"><strong aria-hidden="true">2.69.</strong> mips_target_feature</a></li><li><a href="language-features/mmx-target-feature.html"><strong aria-hidden="true">2.70.</strong> mmx_target_feature</a></li><li><a href="language-features/naked-functions.html"><strong aria-hidden="true">2.71.</strong> naked_functions</a></li><li><a href="language-features/needs-allocator.html"><strong aria-hidden="true">2.72.</strong> needs_allocator</a></li><li><a href="language-features/needs-panic-runtime.html"><strong aria-hidden="true">2.73.</strong> needs_panic_runtime</a></li><li><a href="language-features/never-type.html"><strong aria-hidden="true">2.74.</strong> never_type</a></li><li><a href="language-features/nll.html"><strong aria-hidden="true">2.75.</strong> nll</a></li><li><a href="language-features/no-core.html"><strong aria-hidden="true">2.76.</strong> no_core</a></li><li><a href="language-features/no-debug.html"><strong aria-hidden="true">2.77.</strong> no_debug</a></li><li><a href="language-features/non-ascii-idents.html"><strong aria-hidden="true">2.78.</strong> non_ascii_idents</a></li><li><a href="language-features/non-exhaustive.html"><strong aria-hidden="true">2.79.</strong> non_exhaustive</a></li><li><a href="language-features/non-modrs-mods.html"><strong aria-hidden="true">2.80.</strong> non_modrs_mods</a></li><li><a href="language-features/omit-gdb-pretty-printer-section.html"><strong aria-hidden="true">2.81.</strong> omit_gdb_pretty_printer_section</a></li><li><a href="language-features/on-unimplemented.html"><strong aria-hidden="true">2.82.</strong> on_unimplemented</a></li><li><a href="language-features/optin-builtin-traits.html"><strong aria-hidden="true">2.83.</strong> optin_builtin_traits</a></li><li><a href="language-features/overlapping-marker-traits.html"><strong aria-hidden="true">2.84.</strong> overlapping_marker_traits</a></li><li><a href="language-features/panic-implementation.html"><strong aria-hidden="true">2.85.</strong> panic_implementation</a></li><li><a href="language-features/panic-runtime.html"><strong aria-hidden="true">2.86.</strong> panic_runtime</a></li><li><a href="language-features/pattern-parentheses.html"><strong aria-hidden="true">2.87.</strong> pattern_parentheses</a></li><li><a href="language-features/platform-intrinsics.html"><strong aria-hidden="true">2.88.</strong> platform_intrinsics</a></li><li><a href="language-features/plugin.html"><strong aria-hidden="true">2.89.</strong> plugin</a></li><li><a href="language-features/plugin-registrar.html"><strong aria-hidden="true">2.90.</strong> plugin_registrar</a></li><li><a href="language-features/powerpc-target-feature.html"><strong aria-hidden="true">2.91.</strong> powerpc_target_feature</a></li><li><a href="language-features/prelude-import.html"><strong aria-hidden="true">2.92.</strong> prelude_import</a></li><li><a href="language-features/proc-macro.html"><strong aria-hidden="true">2.93.</strong> proc_macro</a></li><li><a href="language-features/proc-macro-expr.html"><strong aria-hidden="true">2.94.</strong> proc_macro_expr</a></li><li><a href="language-features/proc-macro-gen.html"><strong aria-hidden="true">2.95.</strong> proc_macro_gen</a></li><li><a href="language-features/proc-macro-mod.html"><strong aria-hidden="true">2.96.</strong> proc_macro_mod</a></li><li><a href="language-features/proc-macro-non-items.html"><strong aria-hidden="true">2.97.</strong> proc_macro_non_items</a></li><li><a href="language-features/proc-macro-path-invoc.html"><strong aria-hidden="true">2.98.</strong> proc_macro_path_invoc</a></li><li><a href="language-features/profiler-runtime.html"><strong aria-hidden="true">2.99.</strong> profiler_runtime</a></li><li><a href="language-features/quote.html"><strong aria-hidden="true">2.100.</strong> quote</a></li><li><a href="language-features/raw-identifiers.html"><strong aria-hidden="true">2.101.</strong> raw_identifiers</a></li><li><a href="language-features/repr-packed.html"><strong aria-hidden="true">2.102.</strong> repr_packed</a></li><li><a href="language-features/repr-simd.html"><strong aria-hidden="true">2.103.</strong> repr_simd</a></li><li><a href="language-features/repr128.html"><strong aria-hidden="true">2.104.</strong> repr128</a></li><li><a href="language-features/rustc-attrs.html"><strong aria-hidden="true">2.105.</strong> rustc_attrs</a></li><li><a href="language-features/rustc-const-unstable.html"><strong aria-hidden="true">2.106.</strong> rustc_const_unstable</a></li><li><a href="language-features/rustc-diagnostic-macros.html"><strong aria-hidden="true">2.107.</strong> rustc_diagnostic_macros</a></li><li><a href="language-features/sanitizer-runtime.html"><strong aria-hidden="true">2.108.</strong> sanitizer_runtime</a></li><li><a href="language-features/simd-ffi.html"><strong aria-hidden="true">2.109.</strong> simd_ffi</a></li><li><a href="language-features/slice-patterns.html"><strong aria-hidden="true">2.110.</strong> slice_patterns</a></li><li><a href="language-features/specialization.html"><strong aria-hidden="true">2.111.</strong> specialization</a></li><li><a href="language-features/sse4a-target-feature.html"><strong aria-hidden="true">2.112.</strong> sse4a_target_feature</a></li><li><a href="language-features/staged-api.html"><strong aria-hidden="true">2.113.</strong> staged_api</a></li><li><a href="language-features/start.html"><strong aria-hidden="true">2.114.</strong> start</a></li><li><a href="language-features/static-nobundle.html"><strong aria-hidden="true">2.115.</strong> static_nobundle</a></li><li><a href="language-features/stmt-expr-attributes.html"><strong aria-hidden="true">2.116.</strong> stmt_expr_attributes</a></li><li><a href="language-features/structural-match.html"><strong aria-hidden="true">2.117.</strong> structural_match</a></li><li><a href="language-features/tbm-target-feature.html"><strong aria-hidden="true">2.118.</strong> tbm_target_feature</a></li><li><a href="language-features/thread-local.html"><strong aria-hidden="true">2.119.</strong> thread_local</a></li><li><a href="language-features/tool-attributes.html"><strong aria-hidden="true">2.120.</strong> tool_attributes</a></li><li><a href="language-features/trace-macros.html"><strong aria-hidden="true">2.121.</strong> trace_macros</a></li><li><a href="language-features/trait-alias.html"><strong aria-hidden="true">2.122.</strong> trait_alias</a></li><li><a href="language-features/trivial-bounds.html"><strong aria-hidden="true">2.123.</strong> trivial_bounds</a></li><li><a href="language-features/type-ascription.html"><strong aria-hidden="true">2.124.</strong> type_ascription</a></li><li><a href="language-features/unboxed-closures.html"><strong aria-hidden="true">2.125.</strong> unboxed_closures</a></li><li><a href="language-features/underscore-imports.html"><strong aria-hidden="true">2.126.</strong> underscore_imports</a></li><li><a href="language-features/unsized-tuple-coercion.html"><strong aria-hidden="true">2.127.</strong> unsized_tuple_coercion</a></li><li><a href="language-features/untagged-unions.html"><strong aria-hidden="true">2.128.</strong> untagged_unions</a></li><li><a href="language-features/unwind-attributes.html"><strong aria-hidden="true">2.129.</strong> unwind_attributes</a></li><li><a href="language-features/use-extern-macros.html"><strong aria-hidden="true">2.130.</strong> use_extern_macros</a></li><li><a href="language-features/used.html"><strong aria-hidden="true">2.131.</strong> used</a></li><li><a href="language-features/wasm-custom-section.html"><strong aria-hidden="true">2.132.</strong> wasm_custom_section</a></li><li><a href="language-features/wasm-import-module.html"><strong aria-hidden="true">2.133.</strong> wasm_import_module</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-jemalloc.html"><strong aria-hidden="true">3.5.</strong> alloc_jemalloc</a></li><li><a href="library-features/alloc-system.html"><strong aria-hidden="true">3.6.</strong> alloc_system</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/ascii-ctype.html"><strong aria-hidden="true">3.9.</strong> ascii_ctype</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/box-into-raw-non-null.html"><strong aria-hidden="true">3.11.</strong> box_into_raw_non_null</a></li><li><a href="library-features/bufreader-buffer.html"><strong aria-hidden="true">3.12.</strong> bufreader_buffer</a></li><li><a href="library-features/bufreader-is-empty.html"><strong aria-hidden="true">3.13.</strong> bufreader_is_empty</a></li><li><a href="library-features/bufreader-seek-relative.html"><strong aria-hidden="true">3.14.</strong> bufreader_seek_relative</a></li><li><a href="library-features/c-void-variant.html"><strong aria-hidden="true">3.15.</strong> c_void_variant</a></li><li><a href="library-features/cell-update.html"><strong aria-hidden="true">3.16.</strong> cell_update</a></li><li><a href="library-features/char-error-internals.html"><strong aria-hidden="true">3.17.</strong> char_error_internals</a></li><li><a href="library-features/coerce-unsized.html"><strong aria-hidden="true">3.18.</strong> coerce_unsized</a></li><li><a href="library-features/compiler-builtins-lib.html"><strong aria-hidden="true">3.19.</strong> compiler_builtins_lib</a></li><li><a href="library-features/concat-idents-macro.html"><strong aria-hidden="true">3.20.</strong> concat_idents_macro</a></li><li><a href="library-features/const-int-ops.html"><strong aria-hidden="true">3.21.</strong> const_int_ops</a></li><li><a href="library-features/const-manually-drop-new.html"><strong aria-hidden="true">3.22.</strong> const_manually_drop_new</a></li><li><a href="library-features/const-slice-as-ptr.html"><strong aria-hidden="true">3.23.</strong> const_slice_as_ptr</a></li><li><a href="library-features/const-slice-len.html"><strong aria-hidden="true">3.24.</strong> const_slice_len</a></li><li><a href="library-features/const-str-as-bytes.html"><strong aria-hidden="true">3.25.</strong> const_str_as_bytes</a></li><li><a href="library-features/const-str-as-ptr.html"><strong aria-hidden="true">3.26.</strong> const_str_as_ptr</a></li><li><a href="library-features/const-str-len.html"><strong aria-hidden="true">3.27.</strong> const_str_len</a></li><li><a href="library-features/const-string-new.html"><strong aria-hidden="true">3.28.</strong> const_string_new</a></li><li><a href="library-features/const-type-id.html"><strong aria-hidden="true">3.29.</strong> const_type_id</a></li><li><a href="library-features/const-vec-new.html"><strong aria-hidden="true">3.30.</strong> const_vec_new</a></li><li><a href="library-features/core-intrinsics.html"><strong aria-hidden="true">3.31.</strong> core_intrinsics</a></li><li><a href="library-features/core-panic.html"><strong aria-hidden="true">3.32.</strong> core_panic</a></li><li><a href="library-features/core-panic-info.html"><strong aria-hidden="true">3.33.</strong> core_panic_info</a></li><li><a href="library-features/core-private-bignum.html"><strong aria-hidden="true">3.34.</strong> core_private_bignum</a></li><li><a href="library-features/core-private-diy-float.html"><strong aria-hidden="true">3.35.</strong> core_private_diy_float</a></li><li><a href="library-features/deadline-api.html"><strong aria-hidden="true">3.36.</strong> deadline_api</a></li><li><a href="library-features/dec2flt.html"><strong aria-hidden="true">3.37.</strong> dec2flt</a></li><li><a href="library-features/decode-utf8.html"><strong aria-hidden="true">3.38.</strong> decode_utf8</a></li><li><a href="library-features/derive-clone-copy.html"><strong aria-hidden="true">3.39.</strong> derive_clone_copy</a></li><li><a href="library-features/derive-eq.html"><strong aria-hidden="true">3.40.</strong> derive_eq</a></li><li><a href="library-features/drain-filter.html"><strong aria-hidden="true">3.41.</strong> drain_filter</a></li><li><a href="library-features/duration-as-u128.html"><strong aria-hidden="true">3.42.</strong> duration_as_u128</a></li><li><a href="library-features/duration-getters.html"><strong aria-hidden="true">3.43.</strong> duration_getters</a></li><li><a href="library-features/error-type-id.html"><strong aria-hidden="true">3.44.</strong> error_type_id</a></li><li><a href="library-features/euclidean-division.html"><strong aria-hidden="true">3.45.</strong> euclidean_division</a></li><li><a href="library-features/exact-chunks.html"><strong aria-hidden="true">3.46.</strong> exact_chunks</a></li><li><a href="library-features/exact-size-is-empty.html"><strong aria-hidden="true">3.47.</strong> exact_size_is_empty</a></li><li><a href="library-features/extra-log-consts.html"><strong aria-hidden="true">3.48.</strong> extra_log_consts</a></li><li><a href="library-features/fd.html"><strong aria-hidden="true">3.49.</strong> fd</a></li><li><a href="library-features/fd-read.html"><strong aria-hidden="true">3.50.</strong> fd_read</a></li><li><a href="library-features/fixed-size-array.html"><strong aria-hidden="true">3.51.</strong> fixed_size_array</a></li><li><a href="library-features/flt2dec.html"><strong aria-hidden="true">3.52.</strong> flt2dec</a></li><li><a href="library-features/fmt-internals.html"><strong aria-hidden="true">3.53.</strong> fmt_internals</a></li><li><a href="library-features/fn-traits.html"><strong aria-hidden="true">3.54.</strong> fn_traits</a></li><li><a href="library-features/fnbox.html"><strong aria-hidden="true">3.55.</strong> fnbox</a></li><li><a href="library-features/future-atomic-orderings.html"><strong aria-hidden="true">3.56.</strong> future_atomic_orderings</a></li><li><a href="library-features/futures-api.html"><strong aria-hidden="true">3.57.</strong> futures_api</a></li><li><a href="library-features/generator-trait.html"><strong aria-hidden="true">3.58.</strong> generator_trait</a></li><li><a href="library-features/get-type-id.html"><strong aria-hidden="true">3.59.</strong> get_type_id</a></li><li><a href="library-features/hashmap-internals.html"><strong aria-hidden="true">3.60.</strong> hashmap_internals</a></li><li><a href="library-features/int-error-internals.html"><strong aria-hidden="true">3.61.</strong> int_error_internals</a></li><li><a href="library-features/int-to-from-bytes.html"><strong aria-hidden="true">3.62.</strong> int_to_from_bytes</a></li><li><a href="library-features/integer-atomics.html"><strong aria-hidden="true">3.63.</strong> integer_atomics</a></li><li><a href="library-features/io.html"><strong aria-hidden="true">3.64.</strong> io</a></li><li><a href="library-features/io-error-internals.html"><strong aria-hidden="true">3.65.</strong> io_error_internals</a></li><li><a href="library-features/ip.html"><strong aria-hidden="true">3.66.</strong> ip</a></li><li><a href="library-features/ip-constructors.html"><strong aria-hidden="true">3.67.</strong> ip_constructors</a></li><li><a href="library-features/iterator-find-map.html"><strong aria-hidden="true">3.68.</strong> iterator_find_map</a></li><li><a href="library-features/iterator-flatten.html"><strong 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ptr_internals</a></li><li><a href="library-features/ptr-offset-from.html"><strong aria-hidden="true">3.95.</strong> ptr_offset_from</a></li><li><a href="library-features/ptr-wrapping-offset-from.html"><strong aria-hidden="true">3.96.</strong> ptr_wrapping_offset_from</a></li><li><a href="library-features/range-contains.html"><strong aria-hidden="true">3.97.</strong> range_contains</a></li><li><a href="library-features/range-is-empty.html"><strong aria-hidden="true">3.98.</strong> range_is_empty</a></li><li><a href="library-features/raw.html"><strong aria-hidden="true">3.99.</strong> raw</a></li><li><a href="library-features/rc-downcast.html"><strong aria-hidden="true">3.100.</strong> rc_downcast</a></li><li><a href="library-features/read-initializer.html"><strong aria-hidden="true">3.101.</strong> read_initializer</a></li><li><a href="library-features/refcell-map-split.html"><strong aria-hidden="true">3.102.</strong> refcell_map_split</a></li><li><a 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<a class="header" href="language-features/intrinsics.html#intrinsics" id="intrinsics"><h1><code>intrinsics</code></h1></a>
<p>The tracking issue for this feature is: None.</p>
<p>Intrinsics are never intended to be stable directly, but intrinsics are often
exported in some sort of stable manner. Prefer using the stable interfaces to
the intrinsic directly when you can.</p>
<hr />
<p>These are imported as if they were FFI functions, with the special
<code>rust-intrinsic</code> ABI. For example, if one was in a freestanding
context, but wished to be able to <code>transmute</code> between types, and
perform efficient pointer arithmetic, one would import those functions
via a declaration like</p>
<pre><pre class="playpen"><code class="language-rust">#![feature(intrinsics)]
# fn main() {}
extern "rust-intrinsic" {
fn transmute<T, U>(x: T) -> U;
fn offset<T>(dst: *const T, offset: isize) -> *const T;
}
</code></pre></pre>
<p>As with any other FFI functions, these are always <code>unsafe</code> to call.</p>
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