1. The Unstable Book
  2. 1. Compiler flags
    1. 1.1. control_flow_guard
    2. 1.2. emit_stack_sizes
    3. 1.3. profile
    4. 1.4. report_time
    5. 1.5. sanitizer
    6. 1.6. self_profile
    7. 1.7. self_profile_events
    8. 1.8. src_hash_algorithm
    9. 1.9. strip
    10. 1.10. tls_model
  3. 2. Language features
    1. 2.1. aarch64_target_feature
    2. 2.2. abi_amdgpu_kernel
    3. 2.3. abi_avr_interrupt
    4. 2.4. abi_efiapi
    5. 2.5. abi_msp430_interrupt
    6. 2.6. abi_ptx
    7. 2.7. abi_thiscall
    8. 2.8. abi_unadjusted
    9. 2.9. abi_vectorcall
    10. 2.10. abi_x86_interrupt
    11. 2.11. adx_target_feature
    12. 2.12. alloc_error_handler
    13. 2.13. allocator_internals
    14. 2.14. allow_fail
    15. 2.15. allow_internal_unsafe
    16. 2.16. allow_internal_unstable
    17. 2.17. arbitrary_enum_discriminant
    18. 2.18. arbitrary_self_types
    19. 2.19. arm_target_feature
    20. 2.20. associated_type_bounds
    21. 2.21. associated_type_defaults
    22. 2.22. async_closure
    23. 2.23. avx512_target_feature
    24. 2.24. bindings_after_at
    25. 2.25. box_patterns
    26. 2.26. box_syntax
    27. 2.27. c_variadic
    28. 2.28. cfg_sanitize
    29. 2.29. cfg_target_has_atomic
    30. 2.30. cfg_target_thread_local
    31. 2.31. cfg_version
    32. 2.32. cmpxchg16b_target_feature
    33. 2.33. compiler_builtins
    34. 2.34. const_eval_limit
    35. 2.35. const_extern_fn
    36. 2.36. const_fn
    37. 2.37. const_fn_transmute
    38. 2.38. const_fn_union
    39. 2.39. const_generics
    40. 2.40. const_in_array_repeat_expressions
    41. 2.41. const_mut_refs
    42. 2.42. const_panic
    43. 2.43. const_precise_live_drops
    44. 2.44. const_raw_ptr_deref
    45. 2.45. const_raw_ptr_to_usize_cast
    46. 2.46. const_trait_bound_opt_out
    47. 2.47. const_trait_impl
    48. 2.48. crate_visibility_modifier
    49. 2.49. custom_inner_attributes
    50. 2.50. custom_test_frameworks
    51. 2.51. decl_macro
    52. 2.52. default_type_parameter_fallback
    53. 2.53. doc_alias
    54. 2.54. doc_cfg
    55. 2.55. doc_keyword
    56. 2.56. doc_masked
    57. 2.57. dropck_eyepatch
    58. 2.58. exclusive_range_pattern
    59. 2.59. exhaustive_patterns
    60. 2.60. extern_types
    61. 2.61. external_doc
    62. 2.62. f16c_target_feature
    63. 2.63. ffi_const
    64. 2.64. ffi_pure
    65. 2.65. ffi_returns_twice
    66. 2.66. format_args_capture
    67. 2.67. fundamental
    68. 2.68. generators
    69. 2.69. generic_associated_types
    70. 2.70. half_open_range_patterns
    71. 2.71. hexagon_target_feature
    72. 2.72. impl_trait_in_bindings
    73. 2.73. in_band_lifetimes
    74. 2.74. infer_static_outlives_requirements
    75. 2.75. intrinsics
    76. 2.76. label_break_value
    77. 2.77. lang_items
    78. 2.78. lazy_normalization_consts
    79. 2.79. let_chains
    80. 2.80. link_args
    81. 2.81. link_cfg
    82. 2.82. link_llvm_intrinsics
    83. 2.83. linkage
    84. 2.84. lint_reasons
    85. 2.85. main
    86. 2.86. marker_trait_attr
    87. 2.87. member_constraints
    88. 2.88. min_specialization
    89. 2.89. mips_target_feature
    90. 2.90. mmx_target_feature
    91. 2.91. movbe_target_feature
    92. 2.92. move_ref_pattern
    93. 2.93. naked_functions
    94. 2.94. needs_panic_runtime
    95. 2.95. negative_impls
    96. 2.96. never_type
    97. 2.97. never_type_fallback
    98. 2.98. nll
    99. 2.99. no_core
    100. 2.100. no_niche
    101. 2.101. no_sanitize
    102. 2.102. non_ascii_idents
    103. 2.103. object_safe_for_dispatch
    104. 2.104. omit_gdb_pretty_printer_section
    105. 2.105. optimize_attribute
    106. 2.106. optin_builtin_traits
    107. 2.107. or_patterns
    108. 2.108. panic_runtime
    109. 2.109. platform_intrinsics
    110. 2.110. plugin
    111. 2.111. plugin_registrar
    112. 2.112. powerpc_target_feature
    113. 2.113. precise_pointer_size_matching
    114. 2.114. prelude_import
    115. 2.115. proc_macro_hygiene
    116. 2.116. profiler_runtime
    117. 2.117. raw_dylib
    118. 2.118. raw_ref_op
    119. 2.119. register_attr
    120. 2.120. register_tool
    121. 2.121. repr_simd
    122. 2.122. repr128
    123. 2.123. riscv_target_feature
    124. 2.124. rtm_target_feature
    125. 2.125. rustc_attrs
    126. 2.126. rustc_private
    127. 2.127. simd_ffi
    128. 2.128. specialization
    129. 2.129. sse4a_target_feature
    130. 2.130. staged_api
    131. 2.131. start
    132. 2.132. static_nobundle
    133. 2.133. stmt_expr_attributes
    134. 2.134. structural_match
    135. 2.135. target_feature_11
    136. 2.136. tbm_target_feature
    137. 2.137. test_2018_feature
    138. 2.138. thread_local
    139. 2.139. trait_alias
    140. 2.140. transparent_unions
    141. 2.141. trivial_bounds
    142. 2.142. try_blocks
    143. 2.143. type_alias_impl_trait
    144. 2.144. type_ascription
    145. 2.145. unboxed_closures
    146. 2.146. unsafe_block_in_unsafe_fn
    147. 2.147. unsized_locals
    148. 2.148. unsized_tuple_coercion
    149. 2.149. untagged_unions
    150. 2.150. unwind_attributes
    151. 2.151. wasm_target_feature
  4. 3. Library Features
    1. 3.1. alloc_error_hook
    2. 3.2. alloc_internals
    3. 3.3. alloc_layout_extra
    4. 3.4. alloc_prelude
    5. 3.5. allocator_api
    6. 3.6. arc_mutate_strong_count
    7. 3.7. array_error_internals
    8. 3.8. array_value_iter
    9. 3.9. asm
    10. 3.10. assoc_char_consts
    11. 3.11. assoc_char_funcs
    12. 3.12. atomic_mut_ptr
    13. 3.13. backtrace
    14. 3.14. binary_heap_drain_sorted
    15. 3.15. binary_heap_into_iter_sorted
    16. 3.16. binary_heap_retain
    17. 3.17. bool_to_option
    18. 3.18. bound_cloned
    19. 3.19. box_into_boxed_slice
    20. 3.20. box_into_pin
    21. 3.21. box_into_raw_non_null
    22. 3.22. btree_drain_filter
    23. 3.23. bufreader_seek_relative
    24. 3.24. c_void_variant
    25. 3.25. can_vector
    26. 3.26. cell_leak
    27. 3.27. cell_update
    28. 3.28. cfg_accessible
    29. 3.29. char_error_internals
    30. 3.30. char_internals
    31. 3.31. clamp
    32. 3.32. cmp_min_max_by
    33. 3.33. coerce_unsized
    34. 3.34. concat_idents
    35. 3.35. const_alloc_layout
    36. 3.36. const_ascii_ctype_on_intrinsics
    37. 3.37. const_btree_new
    38. 3.38. const_caller_location
    39. 3.39. const_checked_int_methods
    40. 3.40. const_cstr_unchecked
    41. 3.41. const_cttz
    42. 3.42. const_discriminant
    43. 3.43. const_euclidean_int_methods
    44. 3.44. const_generic_impls_guard
    45. 3.45. const_int_pow
    46. 3.46. const_int_sign
    47. 3.47. const_int_unchecked_arith
    48. 3.48. const_likely
    49. 3.49. const_nonnull_slice_from_raw_parts
    50. 3.50. const_nonzero_int_methods
    51. 3.51. const_overflowing_int_methods
    52. 3.52. const_pref_align_of
    53. 3.53. const_ptr_offset
    54. 3.54. const_ptr_offset_from
    55. 3.55. const_raw_ptr_comparison
    56. 3.56. const_result
    57. 3.57. const_saturating_int_methods
    58. 3.58. const_slice_from_raw_parts
    59. 3.59. const_slice_ptr_len
    60. 3.60. const_transmute
    61. 3.61. const_type_id
    62. 3.62. const_type_name
    63. 3.63. const_wrapping_int_methods
    64. 3.64. constctlz
    65. 3.65. container_error_extra
    66. 3.66. convert_float_to_int
    67. 3.67. core_intrinsics
    68. 3.68. core_panic
    69. 3.69. core_private_bignum
    70. 3.70. core_private_diy_float
    71. 3.71. cow_is_borrowed
    72. 3.72. cstring_from_vec_with_nul
    73. 3.73. deadline_api
    74. 3.74. debug_non_exhaustive
    75. 3.75. dec2flt
    76. 3.76. default_free_fn
    77. 3.77. deque_make_contiguous
    78. 3.78. deque_range
    79. 3.79. derive_clone_copy
    80. 3.80. derive_eq
    81. 3.81. discriminant_kind
    82. 3.82. dispatch_from_dyn
    83. 3.83. div_duration
    84. 3.84. drain_filter
    85. 3.85. duration_constants
    86. 3.86. duration_zero
    87. 3.87. entry_insert
    88. 3.88. error_iter
    89. 3.89. error_type_id
    90. 3.90. exact_size_is_empty
    91. 3.91. extend_one
    92. 3.92. fd
    93. 3.93. fd_read
    94. 3.94. fixed_size_array
    95. 3.95. flt2dec
    96. 3.96. fmt_internals
    97. 3.97. fn_traits
    98. 3.98. foo
    99. 3.99. forget_unsized
    100. 3.100. format_args_nl
    101. 3.101. future_poll_fn
    102. 3.102. future_readiness_fns
    103. 3.103. gen_future
    104. 3.104. generator_trait
    105. 3.105. get_mut_unchecked
    106. 3.106. global_asm
    107. 3.107. hash_raw_entry
    108. 3.108. hash_set_entry
    109. 3.109. hashmap_internals
    110. 3.110. inner_deref
    111. 3.111. int_error_internals
    112. 3.112. int_error_matching
    113. 3.113. integer_atomics
    114. 3.114. internal_uninit_const
    115. 3.115. into_future
    116. 3.116. io_slice_advance
    117. 3.117. ip
    118. 3.118. is_sorted
    119. 3.119. iter_is_partitioned
    120. 3.120. iter_map_while
    121. 3.121. iter_order_by
    122. 3.122. iter_partition_in_place
    123. 3.123. iterator_fold_self
    124. 3.124. layout_for_ptr
    125. 3.125. liballoc_internals
    126. 3.126. libstd_io_internals
    127. 3.127. libstd_sys_internals
    128. 3.128. libstd_thread_internals
    129. 3.129. linked_list_cursors
    130. 3.130. linked_list_extras
    131. 3.131. linked_list_prepend
    132. 3.132. linked_list_remove
    133. 3.133. llvm_asm
    134. 3.134. log_syntax
    135. 3.135. map_entry_replace
    136. 3.136. map_first_last
    137. 3.137. maybe_uninit_extra
    138. 3.138. maybe_uninit_ref
    139. 3.139. maybe_uninit_slice
    140. 3.140. maybe_uninit_slice_assume_init
    141. 3.141. maybe_uninit_uninit_array
    142. 3.142. new_uninit
    143. 3.143. nonnull_slice_from_raw_parts
    144. 3.144. once_poison
    145. 3.145. option_expect_none
    146. 3.146. option_result_contains
    147. 3.147. option_unwrap_none
    148. 3.148. option_zip
    149. 3.149. or_insert_with_key
    150. 3.150. osstring_ascii
    151. 3.151. panic_abort
    152. 3.152. panic_info_message
    153. 3.153. panic_internals
    154. 3.154. panic_unwind
    155. 3.155. partition_point
    156. 3.156. pattern
    157. 3.157. peekable_next_if
    158. 3.158. poll_map
    159. 3.159. print_internals
    160. 3.160. proc_macro_def_site
    161. 3.161. proc_macro_diagnostic
    162. 3.162. proc_macro_internals
    163. 3.163. proc_macro_is_available
    164. 3.164. proc_macro_quote
    165. 3.165. proc_macro_raw_ident
    166. 3.166. proc_macro_span
    167. 3.167. process_exitcode_placeholder
    168. 3.168. process_internals
    169. 3.169. profiler_runtime_lib
    170. 3.170. ptr_internals
    171. 3.171. ptr_offset_from
    172. 3.172. ptr_wrapping_offset_from
    173. 3.173. range_is_empty
    174. 3.174. raw
    175. 3.175. raw_ref_macros
    176. 3.176. raw_vec_internals
    177. 3.177. rc_into_raw_non_null
    178. 3.178. read_initializer
    179. 3.179. receiver_trait
    180. 3.180. refcell_take
    181. 3.181. renamed_spin_loop
    182. 3.182. result_cloned
    183. 3.183. result_contains_err
    184. 3.184. result_copied
    185. 3.185. result_flattening
    186. 3.186. rt
    187. 3.187. seek_convenience
    188. 3.188. set_stdio
    189. 3.189. sgx_platform
    190. 3.190. shrink_to
    191. 3.191. slice_concat_ext
    192. 3.192. slice_concat_trait
    193. 3.193. slice_fill
    194. 3.194. slice_index_methods
    195. 3.195. slice_internals
    196. 3.196. slice_iter_mut_as_slice
    197. 3.197. slice_partition_at_index
    198. 3.198. slice_partition_dedup
    199. 3.199. slice_ptr_len
    200. 3.200. slice_ptr_range
    201. 3.201. slice_strip
    202. 3.202. sort_internals
    203. 3.203. split_inclusive
    204. 3.204. std_internals
    205. 3.205. stdsimd
    206. 3.206. step_trait
    207. 3.207. step_trait_ext
    208. 3.208. str_internals
    209. 3.209. tau_constant
    210. 3.210. termination_trait_lib
    211. 3.211. test
    212. 3.212. thread_id_value
    213. 3.213. thread_local_internals
    214. 3.214. thread_spawn_unchecked
    215. 3.215. tidy_test_never_used_anywhere_else
    216. 3.216. toowned_clone_into
    217. 3.217. total_cmp
    218. 3.218. trace_macros
    219. 3.219. trusted_len
    220. 3.220. try_find
    221. 3.221. try_reserve
    222. 3.222. try_trait
    223. 3.223. type_name_of_val
    224. 3.224. unchecked_math
    225. 3.225. unicode_internals
    226. 3.226. unsafe_cell_raw_get
    227. 3.227. unsize
    228. 3.228. unwrap_infallible
    229. 3.229. update_panic_count
    230. 3.230. variant_count
    231. 3.231. vec_into_raw_parts
    232. 3.232. vec_leak
    233. 3.233. vec_remove_item
    234. 3.234. vec_resize_default
    235. 3.235. wake_trait
    236. 3.236. wasi_ext
    237. 3.237. windows_by_handle
    238. 3.238. windows_c
    239. 3.239. windows_file_type_ext
    240. 3.240. windows_handle
    241. 3.241. windows_net
    242. 3.242. windows_stdio
    243. 3.243. with_options
    244. 3.244. wrapping_int_impl
    245. 3.245. wrapping_next_power_of_two
    246. 3.246. write_all_vectored

The Rust Unstable Book

Library Features