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
  3. 2. Language features
    1. 2.1. aarch64_target_feature
    2. 2.2. abi_amdgpu_kernel
    3. 2.3. abi_efiapi
    4. 2.4. abi_msp430_interrupt
    5. 2.5. abi_ptx
    6. 2.6. abi_thiscall
    7. 2.7. abi_unadjusted
    8. 2.8. abi_vectorcall
    9. 2.9. abi_x86_interrupt
    10. 2.10. adx_target_feature
    11. 2.11. alloc_error_handler
    12. 2.12. allocator_internals
    13. 2.13. allow_fail
    14. 2.14. allow_internal_unsafe
    15. 2.15. allow_internal_unstable
    16. 2.16. arbitrary_enum_discriminant
    17. 2.17. arbitrary_self_types
    18. 2.18. arm_target_feature
    19. 2.19. associated_type_bounds
    20. 2.20. associated_type_defaults
    21. 2.21. async_closure
    22. 2.22. avx512_target_feature
    23. 2.23. bindings_after_at
    24. 2.24. box_patterns
    25. 2.25. box_syntax
    26. 2.26. c_variadic
    27. 2.27. cfg_sanitize
    28. 2.28. cfg_target_has_atomic
    29. 2.29. cfg_target_thread_local
    30. 2.30. cmpxchg16b_target_feature
    31. 2.31. compiler_builtins
    32. 2.32. const_compare_raw_pointers
    33. 2.33. const_eval_limit
    34. 2.34. const_extern_fn
    35. 2.35. const_fn
    36. 2.36. const_fn_union
    37. 2.37. const_generics
    38. 2.38. const_if_match
    39. 2.39. const_in_array_repeat_expressions
    40. 2.40. const_loop
    41. 2.41. const_mut_refs
    42. 2.42. const_panic
    43. 2.43. const_raw_ptr_deref
    44. 2.44. const_raw_ptr_to_usize_cast
    45. 2.45. const_trait_bound_opt_out
    46. 2.46. const_trait_impl
    47. 2.47. crate_visibility_modifier
    48. 2.48. custom_inner_attributes
    49. 2.49. custom_test_frameworks
    50. 2.50. decl_macro
    51. 2.51. default_type_parameter_fallback
    52. 2.52. doc_alias
    53. 2.53. doc_cfg
    54. 2.54. doc_keyword
    55. 2.55. doc_masked
    56. 2.56. dropck_eyepatch
    57. 2.57. exclusive_range_pattern
    58. 2.58. exhaustive_patterns
    59. 2.59. extern_types
    60. 2.60. external_doc
    61. 2.61. f16c_target_feature
    62. 2.62. ffi_returns_twice
    63. 2.63. fundamental
    64. 2.64. generators
    65. 2.65. generic_associated_types
    66. 2.66. half_open_range_patterns
    67. 2.67. hexagon_target_feature
    68. 2.68. impl_trait_in_bindings
    69. 2.69. in_band_lifetimes
    70. 2.70. infer_static_outlives_requirements
    71. 2.71. intrinsics
    72. 2.72. label_break_value
    73. 2.73. lang_items
    74. 2.74. let_chains
    75. 2.75. link_args
    76. 2.76. link_cfg
    77. 2.77. link_llvm_intrinsics
    78. 2.78. linkage
    79. 2.79. lint_reasons
    80. 2.80. main
    81. 2.81. marker_trait_attr
    82. 2.82. member_constraints
    83. 2.83. min_specialization
    84. 2.84. mips_target_feature
    85. 2.85. mmx_target_feature
    86. 2.86. movbe_target_feature
    87. 2.87. move_ref_pattern
    88. 2.88. naked_functions
    89. 2.89. needs_panic_runtime
    90. 2.90. negative_impls
    91. 2.91. never_type
    92. 2.92. never_type_fallback
    93. 2.93. nll
    94. 2.94. no_core
    95. 2.95. no_niche
    96. 2.96. no_sanitize
    97. 2.97. non_ascii_idents
    98. 2.98. object_safe_for_dispatch
    99. 2.99. omit_gdb_pretty_printer_section
    100. 2.100. optimize_attribute
    101. 2.101. optin_builtin_traits
    102. 2.102. or_patterns
    103. 2.103. panic_runtime
    104. 2.104. platform_intrinsics
    105. 2.105. plugin
    106. 2.106. plugin_registrar
    107. 2.107. powerpc_target_feature
    108. 2.108. precise_pointer_size_matching
    109. 2.109. prelude_import
    110. 2.110. proc_macro_hygiene
    111. 2.111. profiler_runtime
    112. 2.112. raw_dylib
    113. 2.113. raw_ref_op
    114. 2.114. register_attr
    115. 2.115. register_tool
    116. 2.116. repr_simd
    117. 2.117. repr128
    118. 2.118. rtm_target_feature
    119. 2.119. rustc_attrs
    120. 2.120. rustc_private
    121. 2.121. simd_ffi
    122. 2.122. specialization
    123. 2.123. sse4a_target_feature
    124. 2.124. staged_api
    125. 2.125. start
    126. 2.126. static_nobundle
    127. 2.127. stmt_expr_attributes
    128. 2.128. structural_match
    129. 2.129. tbm_target_feature
    130. 2.130. test_2018_feature
    131. 2.131. thread_local
    132. 2.132. track_caller
    133. 2.133. trait_alias
    134. 2.134. transparent_unions
    135. 2.135. trivial_bounds
    136. 2.136. try_blocks
    137. 2.137. type_alias_impl_trait
    138. 2.138. type_ascription
    139. 2.139. unboxed_closures
    140. 2.140. unsized_locals
    141. 2.141. unsized_tuple_coercion
    142. 2.142. untagged_unions
    143. 2.143. unwind_attributes
    144. 2.144. 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. array_error_internals
    7. 3.7. array_value_iter
    8. 3.8. asm
    9. 3.9. atomic_min_max
    10. 3.10. atomic_mut_ptr
    11. 3.11. backtrace
    12. 3.12. binary_heap_drain_sorted
    13. 3.13. binary_heap_into_iter_sorted
    14. 3.14. bool_to_option
    15. 3.15. bound_cloned
    16. 3.16. box_into_pin
    17. 3.17. box_into_raw_non_null
    18. 3.18. btree_drain_filter
    19. 3.19. btreemap_remove_entry
    20. 3.20. buffered_io_capacity
    21. 3.21. bufreader_seek_relative
    22. 3.22. c_void_variant
    23. 3.23. cell_leak
    24. 3.24. cell_update
    25. 3.25. cfg_accessible
    26. 3.26. char_error_internals
    27. 3.27. clamp
    28. 3.28. cmp_min_max_by
    29. 3.29. coerce_unsized
    30. 3.30. concat_idents
    31. 3.31. const_alloc_layout
    32. 3.32. const_ascii_ctype_on_intrinsics
    33. 3.33. const_caller_location
    34. 3.34. const_checked_int_methods
    35. 3.35. const_cstr_unchecked
    36. 3.36. const_cttz
    37. 3.37. const_discriminant
    38. 3.38. const_euclidean_int_methods
    39. 3.39. const_forget
    40. 3.40. const_generic_impls_guard
    41. 3.41. const_int_pow
    42. 3.42. const_int_sign
    43. 3.43. const_int_unchecked_arith
    44. 3.44. const_nonzero_int_methods
    45. 3.45. const_overflowing_int_methods
    46. 3.46. const_pref_align_of
    47. 3.47. const_ptr_offset_from
    48. 3.48. const_result
    49. 3.49. const_saturating_int_methods
    50. 3.50. const_slice_from_raw_parts
    51. 3.51. const_slice_ptr_len
    52. 3.52. const_transmute
    53. 3.53. const_type_id
    54. 3.54. const_type_name
    55. 3.55. const_wrapping_int_methods
    56. 3.56. constctlz
    57. 3.57. container_error_extra
    58. 3.58. convert_float_to_int
    59. 3.59. core_intrinsics
    60. 3.60. core_panic
    61. 3.61. core_private_bignum
    62. 3.62. core_private_diy_float
    63. 3.63. cow_is_borrowed
    64. 3.64. deadline_api
    65. 3.65. debug_non_exhaustive
    66. 3.66. dec2flt
    67. 3.67. deque_make_contiguous
    68. 3.68. derive_clone_copy
    69. 3.69. derive_eq
    70. 3.70. dispatch_from_dyn
    71. 3.71. div_duration
    72. 3.72. drain_filter
    73. 3.73. duration_constants
    74. 3.74. entry_insert
    75. 3.75. error_iter
    76. 3.76. error_type_id
    77. 3.77. exact_size_is_empty
    78. 3.78. fd
    79. 3.79. fd_read
    80. 3.80. fixed_size_array
    81. 3.81. flt2dec
    82. 3.82. fmt_internals
    83. 3.83. fn_traits
    84. 3.84. foo
    85. 3.85. forget_unsized
    86. 3.86. format_args_nl
    87. 3.87. gen_future
    88. 3.88. generator_trait
    89. 3.89. get_mut_unchecked
    90. 3.90. global_asm
    91. 3.91. hash_raw_entry
    92. 3.92. hash_set_entry
    93. 3.93. hashmap_internals
    94. 3.94. inner_deref
    95. 3.95. int_error_internals
    96. 3.96. int_error_matching
    97. 3.97. integer_atomics
    98. 3.98. internal_uninit_const
    99. 3.99. io_slice_advance
    100. 3.100. ip
    101. 3.101. is_sorted
    102. 3.102. iter_is_partitioned
    103. 3.103. iter_map_while
    104. 3.104. iter_order_by
    105. 3.105. iter_partition_in_place
    106. 3.106. iterator_fold_self
    107. 3.107. layout_for_ptr
    108. 3.108. leading_trailing_ones
    109. 3.109. liballoc_internals
    110. 3.110. libstd_io_internals
    111. 3.111. libstd_sys_internals
    112. 3.112. libstd_thread_internals
    113. 3.113. linked_list_cursors
    114. 3.114. linked_list_extras
    115. 3.115. linked_list_prepend
    116. 3.116. linked_list_remove
    117. 3.117. llvm_asm
    118. 3.118. log_syntax
    119. 3.119. map_entry_replace
    120. 3.120. map_first_last
    121. 3.121. maybe_uninit_extra
    122. 3.122. maybe_uninit_ref
    123. 3.123. maybe_uninit_slice
    124. 3.124. maybe_uninit_slice_assume_init
    125. 3.125. maybe_uninit_uninit_array
    126. 3.126. new_uninit
    127. 3.127. no_more_cas
    128. 3.128. once_poison
    129. 3.129. option_expect_none
    130. 3.130. option_result_contains
    131. 3.131. option_unwrap_none
    132. 3.132. option_zip
    133. 3.133. or_insert_with_key
    134. 3.134. osstring_ascii
    135. 3.135. panic_abort
    136. 3.136. panic_info_message
    137. 3.137. panic_internals
    138. 3.138. panic_unwind
    139. 3.139. pattern
    140. 3.140. poll_map
    141. 3.141. print_internals
    142. 3.142. proc_macro_def_site
    143. 3.143. proc_macro_diagnostic
    144. 3.144. proc_macro_internals
    145. 3.145. proc_macro_mixed_site
    146. 3.146. proc_macro_quote
    147. 3.147. proc_macro_raw_ident
    148. 3.148. proc_macro_span
    149. 3.149. process_exitcode_placeholder
    150. 3.150. process_internals
    151. 3.151. process_set_argv0
    152. 3.152. profiler_runtime_lib
    153. 3.153. ptr_internals
    154. 3.154. ptr_offset_from
    155. 3.155. ptr_wrapping_offset_from
    156. 3.156. range_is_empty
    157. 3.157. raw
    158. 3.158. raw_vec_internals
    159. 3.159. rc_into_raw_non_null
    160. 3.160. read_initializer
    161. 3.161. receiver_trait
    162. 3.162. renamed_spin_loop
    163. 3.163. result_cloned
    164. 3.164. result_contains_err
    165. 3.165. result_copied
    166. 3.166. result_flattening
    167. 3.167. rt
    168. 3.168. saturating_neg
    169. 3.169. seek_convenience
    170. 3.170. set_stdio
    171. 3.171. sgx_platform
    172. 3.172. shrink_to
    173. 3.173. slice_concat_ext
    174. 3.174. slice_concat_trait
    175. 3.175. slice_fill
    176. 3.176. slice_index_methods
    177. 3.177. slice_internals
    178. 3.178. slice_iter_mut_as_slice
    179. 3.179. slice_partition_at_index
    180. 3.180. slice_partition_dedup
    181. 3.181. slice_ptr_len
    182. 3.182. slice_ptr_range
    183. 3.183. sort_internals
    184. 3.184. split_inclusive
    185. 3.185. std_internals
    186. 3.186. stdsimd
    187. 3.187. step_trait
    188. 3.188. str_internals
    189. 3.189. str_strip
    190. 3.190. tau_constant
    191. 3.191. termination_trait_lib
    192. 3.192. test
    193. 3.193. thread_id_value
    194. 3.194. thread_local_internals
    195. 3.195. thread_spawn_unchecked
    196. 3.196. tidy_test_never_used_anywhere_else
    197. 3.197. toowned_clone_into
    198. 3.198. trace_macros
    199. 3.199. trusted_len
    200. 3.200. try_find
    201. 3.201. try_reserve
    202. 3.202. try_trait
    203. 3.203. type_name_of_val
    204. 3.204. unicode_internals
    205. 3.205. unicode_version
    206. 3.206. unsafe_cell_raw_get
    207. 3.207. unsize
    208. 3.208. unwrap_infallible
    209. 3.209. update_panic_count
    210. 3.210. vec_drain_as_slice
    211. 3.211. vec_into_raw_parts
    212. 3.212. vec_leak
    213. 3.213. vec_remove_item
    214. 3.214. vec_resize_default
    215. 3.215. wake_trait
    216. 3.216. wasi_ext
    217. 3.217. weak_into_raw
    218. 3.218. windows_by_handle
    219. 3.219. windows_c
    220. 3.220. windows_file_type_ext
    221. 3.221. windows_handle
    222. 3.222. windows_net
    223. 3.223. windows_stdio
    224. 3.224. with_options
    225. 3.225. wrapping_int_impl
    226. 3.226. wrapping_next_power_of_two
    227. 3.227. write_all_vectored

The Rust Unstable Book

Library Features