1. The Unstable Book
  2. 1. Compiler flags
    1. 1.1. emit_stack_sizes
    2. 1.2. profile
    3. 1.3. report_time
  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. box_patterns
    24. 2.24. box_syntax
    25. 2.25. c_variadic
    26. 2.26. cfg_sanitize
    27. 2.27. cfg_target_has_atomic
    28. 2.28. cfg_target_thread_local
    29. 2.29. cmpxchg16b_target_feature
    30. 2.30. compiler_builtins
    31. 2.31. const_compare_raw_pointers
    32. 2.32. const_extern_fn
    33. 2.33. const_fn
    34. 2.34. const_fn_union
    35. 2.35. const_generics
    36. 2.36. const_if_match
    37. 2.37. const_in_array_repeat_expressions
    38. 2.38. const_loop
    39. 2.39. const_mut_refs
    40. 2.40. const_panic
    41. 2.41. const_raw_ptr_deref
    42. 2.42. const_raw_ptr_to_usize_cast
    43. 2.43. crate_visibility_modifier
    44. 2.44. custom_inner_attributes
    45. 2.45. custom_test_frameworks
    46. 2.46. decl_macro
    47. 2.47. default_type_parameter_fallback
    48. 2.48. doc_alias
    49. 2.49. doc_cfg
    50. 2.50. doc_keyword
    51. 2.51. doc_masked
    52. 2.52. doc_spotlight
    53. 2.53. dropck_eyepatch
    54. 2.54. exclusive_range_pattern
    55. 2.55. exhaustive_patterns
    56. 2.56. extern_types
    57. 2.57. external_doc
    58. 2.58. f16c_target_feature
    59. 2.59. ffi_returns_twice
    60. 2.60. fundamental
    61. 2.61. generators
    62. 2.62. generic_associated_types
    63. 2.63. hexagon_target_feature
    64. 2.64. impl_trait_in_bindings
    65. 2.65. in_band_lifetimes
    66. 2.66. infer_static_outlives_requirements
    67. 2.67. intrinsics
    68. 2.68. label_break_value
    69. 2.69. lang_items
    70. 2.70. let_chains
    71. 2.71. link_args
    72. 2.72. link_cfg
    73. 2.73. link_llvm_intrinsics
    74. 2.74. linkage
    75. 2.75. lint_reasons
    76. 2.76. main
    77. 2.77. marker_trait_attr
    78. 2.78. member_constraints
    79. 2.79. mips_target_feature
    80. 2.80. mmx_target_feature
    81. 2.81. movbe_target_feature
    82. 2.82. naked_functions
    83. 2.83. needs_panic_runtime
    84. 2.84. never_type
    85. 2.85. never_type_fallback
    86. 2.86. nll
    87. 2.87. no_core
    88. 2.88. no_debug
    89. 2.89. non_ascii_idents
    90. 2.90. object_safe_for_dispatch
    91. 2.91. omit_gdb_pretty_printer_section
    92. 2.92. optimize_attribute
    93. 2.93. optin_builtin_traits
    94. 2.94. or_patterns
    95. 2.95. overlapping_marker_traits
    96. 2.96. panic_runtime
    97. 2.97. platform_intrinsics
    98. 2.98. plugin
    99. 2.99. plugin_registrar
    100. 2.100. powerpc_target_feature
    101. 2.101. precise_pointer_size_matching
    102. 2.102. prelude_import
    103. 2.103. proc_macro_hygiene
    104. 2.104. profiler_runtime
    105. 2.105. raw_dylib
    106. 2.106. raw_ref_op
    107. 2.107. register_attr
    108. 2.108. register_tool
    109. 2.109. repr_simd
    110. 2.110. repr128
    111. 2.111. rtm_target_feature
    112. 2.112. rustc_attrs
    113. 2.113. rustc_private
    114. 2.114. sanitizer_runtime
    115. 2.115. simd_ffi
    116. 2.116. slice_patterns
    117. 2.117. specialization
    118. 2.118. sse4a_target_feature
    119. 2.119. staged_api
    120. 2.120. start
    121. 2.121. static_nobundle
    122. 2.122. stmt_expr_attributes
    123. 2.123. structural_match
    124. 2.124. tbm_target_feature
    125. 2.125. test_2018_feature
    126. 2.126. thread_local
    127. 2.127. track_caller
    128. 2.128. trait_alias
    129. 2.129. transparent_enums
    130. 2.130. transparent_unions
    131. 2.131. trivial_bounds
    132. 2.132. try_blocks
    133. 2.133. type_alias_impl_trait
    134. 2.134. type_ascription
    135. 2.135. unboxed_closures
    136. 2.136. unsized_locals
    137. 2.137. unsized_tuple_coercion
    138. 2.138. untagged_unions
    139. 2.139. unwind_attributes
    140. 2.140. 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. boxed_slice_try_from
    19. 3.19. bufreader_seek_relative
    20. 3.20. c_void_variant
    21. 3.21. cell_update
    22. 3.22. char_error_internals
    23. 3.23. clamp
    24. 3.24. cmp_min_max_by
    25. 3.25. coerce_unsized
    26. 3.26. compiler_builtins_lib
    27. 3.27. concat_idents
    28. 3.28. const_cstr_unchecked
    29. 3.29. const_generic_impls_guard
    30. 3.30. const_int_conversion
    31. 3.31. const_int_sign
    32. 3.32. const_ptr_offset_from
    33. 3.33. const_saturating_int_methods
    34. 3.34. const_transmute
    35. 3.35. const_type_id
    36. 3.36. const_type_name
    37. 3.37. container_error_extra
    38. 3.38. convert_float_to_int
    39. 3.39. core_intrinsics
    40. 3.40. core_panic
    41. 3.41. core_private_bignum
    42. 3.42. core_private_diy_float
    43. 3.43. cow_is_borrowed
    44. 3.44. deadline_api
    45. 3.45. debug_map_key_value
    46. 3.46. dec2flt
    47. 3.47. derive_clone_copy
    48. 3.48. derive_eq
    49. 3.49. dispatch_from_dyn
    50. 3.50. div_duration
    51. 3.51. drain_filter
    52. 3.52. duration_constants
    53. 3.53. entry_insert
    54. 3.54. error_iter
    55. 3.55. error_type_id
    56. 3.56. exact_size_is_empty
    57. 3.57. extra_log_consts
    58. 3.58. fd
    59. 3.59. fd_read
    60. 3.60. fixed_size_array
    61. 3.61. float_approx_unchecked_to
    62. 3.62. flt2dec
    63. 3.63. fmt_internals
    64. 3.64. fn_traits
    65. 3.65. foo
    66. 3.66. forget_unsized
    67. 3.67. format_args_nl
    68. 3.68. gen_future
    69. 3.69. generator_trait
    70. 3.70. get_mut_unchecked
    71. 3.71. global_asm
    72. 3.72. hash_raw_entry
    73. 3.73. hash_set_entry
    74. 3.74. hashmap_internals
    75. 3.75. inner_deref
    76. 3.76. int_error_internals
    77. 3.77. int_error_matching
    78. 3.78. integer_atomics
    79. 3.79. internal_uninit_const
    80. 3.80. io_slice_advance
    81. 3.81. ip
    82. 3.82. is_sorted
    83. 3.83. iter_is_partitioned
    84. 3.84. iter_once_with
    85. 3.85. iter_order_by
    86. 3.86. iter_partition_in_place
    87. 3.87. liballoc_internals
    88. 3.88. libstd_io_internals
    89. 3.89. libstd_sys_internals
    90. 3.90. libstd_thread_internals
    91. 3.91. linked_list_extras
    92. 3.92. log_syntax
    93. 3.93. manually_drop_take
    94. 3.94. map_entry_replace
    95. 3.95. map_first_last
    96. 3.96. matches_macro
    97. 3.97. maybe_uninit_extra
    98. 3.98. maybe_uninit_ref
    99. 3.99. maybe_uninit_slice
    100. 3.100. maybe_uninit_slice_assume_init
    101. 3.101. maybe_uninit_uninit_array
    102. 3.102. new_uninit
    103. 3.103. no_more_cas
    104. 3.104. once_is_completed
    105. 3.105. once_poison
    106. 3.106. option_expect_none
    107. 3.107. option_result_contains
    108. 3.108. option_unwrap_none
    109. 3.109. panic_abort
    110. 3.110. panic_info_message
    111. 3.111. panic_internals
    112. 3.112. panic_unwind
    113. 3.113. path_buf_capacity
    114. 3.114. pattern
    115. 3.115. poll_map
    116. 3.116. print_internals
    117. 3.117. proc_macro_def_site
    118. 3.118. proc_macro_diagnostic
    119. 3.119. proc_macro_internals
    120. 3.120. proc_macro_mixed_site
    121. 3.121. proc_macro_quote
    122. 3.122. proc_macro_raw_ident
    123. 3.123. proc_macro_span
    124. 3.124. process_exitcode_placeholder
    125. 3.125. process_internals
    126. 3.126. process_set_argv0
    127. 3.127. profiler_runtime_lib
    128. 3.128. ptr_internals
    129. 3.129. ptr_offset_from
    130. 3.130. ptr_wrapping_offset_from
    131. 3.131. range_is_empty
    132. 3.132. raw
    133. 3.133. raw_vec_internals
    134. 3.134. rc_into_raw_non_null
    135. 3.135. read_initializer
    136. 3.136. receiver_trait
    137. 3.137. renamed_spin_loop
    138. 3.138. result_cloned
    139. 3.139. result_contains_err
    140. 3.140. result_copied
    141. 3.141. rt
    142. 3.142. sanitizer_runtime_lib
    143. 3.143. saturating_neg
    144. 3.144. seek_convenience
    145. 3.145. set_stdio
    146. 3.146. sgx_platform
    147. 3.147. shrink_to
    148. 3.148. slice_concat_ext
    149. 3.149. slice_concat_trait
    150. 3.150. slice_from_raw_parts
    151. 3.151. slice_index_methods
    152. 3.152. slice_internals
    153. 3.153. slice_iter_mut_as_slice
    154. 3.154. slice_partition_at_index
    155. 3.155. slice_partition_dedup
    156. 3.156. slice_ptr_range
    157. 3.157. sort_internals
    158. 3.158. std_internals
    159. 3.159. stdsimd
    160. 3.160. step_trait
    161. 3.161. str_internals
    162. 3.162. str_strip
    163. 3.163. tau_constant
    164. 3.164. termination_trait_lib
    165. 3.165. test
    166. 3.166. thread_local_internals
    167. 3.167. thread_spawn_unchecked
    168. 3.168. tidy_test_never_used_anywhere_else
    169. 3.169. toowned_clone_into
    170. 3.170. trace_macros
    171. 3.171. trusted_len
    172. 3.172. try_reserve
    173. 3.173. try_trait
    174. 3.174. type_name_of_val
    175. 3.175. unicode_internals
    176. 3.176. unicode_version
    177. 3.177. unsafe_cell_raw_get
    178. 3.178. unsize
    179. 3.179. update_panic_count
    180. 3.180. vec_drain_as_slice
    181. 3.181. vec_into_raw_parts
    182. 3.182. vec_leak
    183. 3.183. vec_remove_item
    184. 3.184. vec_resize_default
    185. 3.185. wait_timeout_until
    186. 3.186. wait_until
    187. 3.187. wasi_ext
    188. 3.188. weak_into_raw
    189. 3.189. windows_by_handle
    190. 3.190. windows_c
    191. 3.191. windows_file_type_ext
    192. 3.192. windows_handle
    193. 3.193. windows_net
    194. 3.194. windows_stdio
    195. 3.195. with_options
    196. 3.196. wrapping_int_impl
    197. 3.197. wrapping_next_power_of_two

The Rust Unstable Book

Language features