1. The Unstable Book
  2. 1. Compiler flags
    1. 1.1. emit_stack_sizes
    2. 1.2. profile
  3. 2. Language features
    1. 2.1. aarch64_target_feature
    2. 2.2. abi_amdgpu_kernel
    3. 2.3. abi_msp430_interrupt
    4. 2.4. abi_ptx
    5. 2.5. abi_thiscall
    6. 2.6. abi_unadjusted
    7. 2.7. abi_vectorcall
    8. 2.8. abi_x86_interrupt
    9. 2.9. adx_target_feature
    10. 2.10. alloc_error_handler
    11. 2.11. allocator_internals
    12. 2.12. allow_fail
    13. 2.13. allow_internal_unsafe
    14. 2.14. allow_internal_unstable
    15. 2.15. arbitrary_enum_discriminant
    16. 2.16. arbitrary_self_types
    17. 2.17. arm_target_feature
    18. 2.18. associated_type_bounds
    19. 2.19. associated_type_defaults
    20. 2.20. async_await
    21. 2.21. async_closure
    22. 2.22. avx512_target_feature
    23. 2.23. bind_by_move_pattern_guards
    24. 2.24. box_patterns
    25. 2.25. box_syntax
    26. 2.26. c_variadic
    27. 2.27. cfg_doctest
    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_constructor
    34. 2.34. const_fn
    35. 2.35. const_fn_union
    36. 2.36. const_generics
    37. 2.37. const_in_array_repeat_expressions
    38. 2.38. const_panic
    39. 2.39. const_raw_ptr_deref
    40. 2.40. const_raw_ptr_to_usize_cast
    41. 2.41. const_transmute
    42. 2.42. crate_visibility_modifier
    43. 2.43. custom_attribute
    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. macros_in_extern
    77. 2.77. main
    78. 2.78. marker_trait_attr
    79. 2.79. member_constraints
    80. 2.80. mips_target_feature
    81. 2.81. mmx_target_feature
    82. 2.82. movbe_target_feature
    83. 2.83. naked_functions
    84. 2.84. needs_panic_runtime
    85. 2.85. never_type
    86. 2.86. nll
    87. 2.87. no_core
    88. 2.88. no_debug
    89. 2.89. non_ascii_idents
    90. 2.90. non_exhaustive
    91. 2.91. omit_gdb_pretty_printer_section
    92. 2.92. on_unimplemented
    93. 2.93. optimize_attribute
    94. 2.94. optin_builtin_traits
    95. 2.95. overlapping_marker_traits
    96. 2.96. panic_runtime
    97. 2.97. param_attrs
    98. 2.98. platform_intrinsics
    99. 2.99. plugin
    100. 2.100. plugin_registrar
    101. 2.101. powerpc_target_feature
    102. 2.102. precise_pointer_size_matching
    103. 2.103. prelude_import
    104. 2.104. proc_macro_hygiene
    105. 2.105. profiler_runtime
    106. 2.106. re_rebalance_coherence
    107. 2.107. repr_simd
    108. 2.108. repr128
    109. 2.109. rtm_target_feature
    110. 2.110. rustc_attrs
    111. 2.111. rustc_const_unstable
    112. 2.112. rustc_diagnostic_macros
    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. trait_alias
    128. 2.128. transparent_enums
    129. 2.129. transparent_unions
    130. 2.130. trivial_bounds
    131. 2.131. try_blocks
    132. 2.132. type_alias_impl_trait
    133. 2.133. type_ascription
    134. 2.134. unboxed_closures
    135. 2.135. unsized_locals
    136. 2.136. unsized_tuple_coercion
    137. 2.137. untagged_unions
    138. 2.138. unwind_attributes
    139. 2.139. wasm_target_feature
  4. 3. Library Features
    1. 3.1. __rust_unstable_column
    2. 3.2. alloc_error_hook
    3. 3.3. alloc_internals
    4. 3.4. alloc_layout_extra
    5. 3.5. alloc_prelude
    6. 3.6. allocator_api
    7. 3.7. array_error_internals
    8. 3.8. asm
    9. 3.9. atomic_min_max
    10. 3.10. bound_cloned
    11. 3.11. box_into_pin
    12. 3.12. box_into_raw_non_null
    13. 3.13. boxed_slice_try_from
    14. 3.14. bufreader_seek_relative
    15. 3.15. c_void_variant
    16. 3.16. cell_update
    17. 3.17. char_error_internals
    18. 3.18. checked_duration_since
    19. 3.19. clamp
    20. 3.20. coerce_unsized
    21. 3.21. compiler_builtins_lib
    22. 3.22. concat_idents
    23. 3.23. const_cstr_unchecked
    24. 3.24. const_generic_impls_guard
    25. 3.25. const_int_conversion
    26. 3.26. const_int_sign
    27. 3.27. const_saturating_int_methods
    28. 3.28. const_slice_len
    29. 3.29. const_str_as_bytes
    30. 3.30. const_str_len
    31. 3.31. const_string_new
    32. 3.32. const_type_id
    33. 3.33. const_type_name
    34. 3.34. const_vec_new
    35. 3.35. core_intrinsics
    36. 3.36. core_panic
    37. 3.37. core_panic_info
    38. 3.38. core_private_bignum
    39. 3.39. core_private_diy_float
    40. 3.40. deadline_api
    41. 3.41. debug_map_key_value
    42. 3.42. dec2flt
    43. 3.43. derive_clone_copy
    44. 3.44. derive_eq
    45. 3.45. dispatch_from_dyn
    46. 3.46. div_duration
    47. 3.47. drain_filter
    48. 3.48. duration_constants
    49. 3.49. error_iter
    50. 3.50. error_type_id
    51. 3.51. exact_size_is_empty
    52. 3.52. extra_log_consts
    53. 3.53. fd
    54. 3.54. fd_read
    55. 3.55. fixed_size_array
    56. 3.56. float_to_from_bytes
    57. 3.57. flt2dec
    58. 3.58. fmt_internals
    59. 3.59. fn_traits
    60. 3.60. foo
    61. 3.61. forget_unsized
    62. 3.62. format_args_nl
    63. 3.63. gen_future
    64. 3.64. generator_trait
    65. 3.65. global_asm
    66. 3.66. hash_raw_entry
    67. 3.67. hash_set_entry
    68. 3.68. hashmap_internals
    69. 3.69. inner_deref
    70. 3.70. int_error_internals
    71. 3.71. int_error_matching
    72. 3.72. integer_atomics
    73. 3.73. internal_uninit_const
    74. 3.74. io_slice_advance
    75. 3.75. ip
    76. 3.76. is_sorted
    77. 3.77. iter_is_partitioned
    78. 3.78. iter_once_with
    79. 3.79. iter_partition_in_place
    80. 3.80. libstd_io_internals
    81. 3.81. libstd_sys_internals
    82. 3.82. libstd_thread_internals
    83. 3.83. linked_list_extras
    84. 3.84. log_syntax
    85. 3.85. manually_drop_take
    86. 3.86. map_entry_replace
    87. 3.87. map_get_key_value
    88. 3.88. maybe_uninit_array
    89. 3.89. maybe_uninit_extra
    90. 3.90. maybe_uninit_ref
    91. 3.91. maybe_uninit_slice
    92. 3.92. mem_take
    93. 3.93. no_more_cas
    94. 3.94. once_is_completed
    95. 3.95. once_poison
    96. 3.96. option_expect_none
    97. 3.97. option_flattening
    98. 3.98. option_result_contains
    99. 3.99. option_unwrap_none
    100. 3.100. panic_abort
    101. 3.101. panic_info_message
    102. 3.102. panic_internals
    103. 3.103. panic_unwind
    104. 3.104. path_buf_capacity
    105. 3.105. pattern
    106. 3.106. pin_into_inner
    107. 3.107. print_internals
    108. 3.108. proc_macro_def_site
    109. 3.109. proc_macro_diagnostic
    110. 3.110. proc_macro_internals
    111. 3.111. proc_macro_quote
    112. 3.112. proc_macro_raw_ident
    113. 3.113. proc_macro_span
    114. 3.114. process_exitcode_placeholder
    115. 3.115. process_internals
    116. 3.116. profiler_runtime_lib
    117. 3.117. ptr_internals
    118. 3.118. ptr_offset_from
    119. 3.119. ptr_wrapping_offset_from
    120. 3.120. range_is_empty
    121. 3.121. raw
    122. 3.122. raw_vec_internals
    123. 3.123. rc_into_raw_non_null
    124. 3.124. read_initializer
    125. 3.125. receiver_trait
    126. 3.126. renamed_spin_loop
    127. 3.127. repeat_generic_slice
    128. 3.128. result_contains_err
    129. 3.129. result_map_or_else
    130. 3.130. rt
    131. 3.131. sanitizer_runtime_lib
    132. 3.132. saturating_neg
    133. 3.133. seek_convenience
    134. 3.134. set_stdio
    135. 3.135. sgx_platform
    136. 3.136. shrink_to
    137. 3.137. slice_concat_ext
    138. 3.138. slice_concat_trait
    139. 3.139. slice_from_raw_parts
    140. 3.140. slice_index_methods
    141. 3.141. slice_internals
    142. 3.142. slice_iter_mut_as_slice
    143. 3.143. slice_partition_at_index
    144. 3.144. slice_partition_dedup
    145. 3.145. sort_internals
    146. 3.146. std_internals
    147. 3.147. stdsimd
    148. 3.148. step_trait
    149. 3.149. str_internals
    150. 3.150. termination_trait_lib
    151. 3.151. test
    152. 3.152. thread_local_internals
    153. 3.153. thread_spawn_unchecked
    154. 3.154. todo_macro
    155. 3.155. toowned_clone_into
    156. 3.156. trace_macros
    157. 3.157. trusted_len
    158. 3.158. try_reserve
    159. 3.159. try_trait
    160. 3.160. udp_peer_addr
    161. 3.161. unicode_internals
    162. 3.162. unicode_version
    163. 3.163. unsize
    164. 3.164. update_panic_count
    165. 3.165. vec_drain_as_slice
    166. 3.166. vec_leak
    167. 3.167. vec_remove_item
    168. 3.168. vec_resize_default
    169. 3.169. wait_timeout_until
    170. 3.170. wait_until
    171. 3.171. wasi_ext
    172. 3.172. weak_counts
    173. 3.173. weak_into_raw
    174. 3.174. weak_ptr_eq
    175. 3.175. windows_by_handle
    176. 3.176. windows_c
    177. 3.177. windows_file_type_ext
    178. 3.178. windows_handle
    179. 3.179. windows_net
    180. 3.180. windows_stdio
    181. 3.181. wrapping_int_impl
    182. 3.182. wrapping_next_power_of_two

The Rust Unstable Book

Library Features