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_self_types
    16. 2.16. arm_target_feature
    17. 2.17. asm
    18. 2.18. associated_type_defaults
    19. 2.19. async_await
    20. 2.20. avx512_target_feature
    21. 2.21. await_macro
    22. 2.22. bind_by_move_pattern_guards
    23. 2.23. box_patterns
    24. 2.24. box_syntax
    25. 2.25. c_variadic
    26. 2.26. cfg_target_has_atomic
    27. 2.27. cfg_target_thread_local
    28. 2.28. cmpxchg16b_target_feature
    29. 2.29. compiler_builtins
    30. 2.30. concat_idents
    31. 2.31. const_compare_raw_pointers
    32. 2.32. const_fn
    33. 2.33. const_fn_union
    34. 2.34. const_generics
    35. 2.35. const_panic
    36. 2.36. const_raw_ptr_deref
    37. 2.37. const_raw_ptr_to_usize_cast
    38. 2.38. const_transmute
    39. 2.39. crate_visibility_modifier
    40. 2.40. custom_attribute
    41. 2.41. custom_inner_attributes
    42. 2.42. custom_test_frameworks
    43. 2.43. decl_macro
    44. 2.44. default_type_parameter_fallback
    45. 2.45. doc_alias
    46. 2.46. doc_cfg
    47. 2.47. doc_keyword
    48. 2.48. doc_masked
    49. 2.49. doc_spotlight
    50. 2.50. dropck_eyepatch
    51. 2.51. dropck_parametricity
    52. 2.52. exclusive_range_pattern
    53. 2.53. exhaustive_patterns
    54. 2.54. existential_type
    55. 2.55. extern_types
    56. 2.56. external_doc
    57. 2.57. f16c_target_feature
    58. 2.58. ffi_returns_twice
    59. 2.59. format_args_nl
    60. 2.60. fundamental
    61. 2.61. generators
    62. 2.62. generic_associated_types
    63. 2.63. global_asm
    64. 2.64. hexagon_target_feature
    65. 2.65. impl_trait_in_bindings
    66. 2.66. in_band_lifetimes
    67. 2.67. infer_static_outlives_requirements
    68. 2.68. intrinsics
    69. 2.69. label_break_value
    70. 2.70. lang_items
    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. log_syntax
    77. 2.77. macros_in_extern
    78. 2.78. main
    79. 2.79. marker_trait_attr
    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. 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. re_rebalance_coherence
    106. 2.106. repr_align_enum
    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. sanitizer_runtime
    114. 2.114. simd_ffi
    115. 2.115. slice_patterns
    116. 2.116. specialization
    117. 2.117. sse4a_target_feature
    118. 2.118. staged_api
    119. 2.119. start
    120. 2.120. static_nobundle
    121. 2.121. stmt_expr_attributes
    122. 2.122. structural_match
    123. 2.123. tbm_target_feature
    124. 2.124. test_2018_feature
    125. 2.125. thread_local
    126. 2.126. trace_macros
    127. 2.127. trait_alias
    128. 2.128. trivial_bounds
    129. 2.129. try_blocks
    130. 2.130. type_alias_enum_variants
    131. 2.131. type_ascription
    132. 2.132. unboxed_closures
    133. 2.133. underscore_const_names
    134. 2.134. unsized_locals
    135. 2.135. unsized_tuple_coercion
    136. 2.136. untagged_unions
    137. 2.137. unwind_attributes
    138. 2.138. 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. as_cell
    8. 3.8. atomic_min_max
    9. 3.9. borrow_state
    10. 3.10. box_into_pin
    11. 3.11. box_into_raw_non_null
    12. 3.12. bufreader_buffer
    13. 3.13. bufreader_seek_relative
    14. 3.14. c_void_variant
    15. 3.15. cell_update
    16. 3.16. char_error_internals
    17. 3.17. checked_duration_since
    18. 3.18. clamp
    19. 3.19. coerce_unsized
    20. 3.20. compiler_builtins_lib
    21. 3.21. concat_idents_macro
    22. 3.22. const_cstr_unchecked
    23. 3.23. const_int_conversion
    24. 3.24. const_saturating_int_methods
    25. 3.25. const_slice_len
    26. 3.26. const_str_as_bytes
    27. 3.27. const_str_len
    28. 3.28. const_string_new
    29. 3.29. const_type_id
    30. 3.30. const_vec_new
    31. 3.31. copy_within
    32. 3.32. core_intrinsics
    33. 3.33. core_panic
    34. 3.34. core_panic_info
    35. 3.35. core_private_bignum
    36. 3.36. core_private_diy_float
    37. 3.37. deadline_api
    38. 3.38. dec2flt
    39. 3.39. derive_clone_copy
    40. 3.40. derive_eq
    41. 3.41. dispatch_from_dyn
    42. 3.42. drain_filter
    43. 3.43. duration_constants
    44. 3.44. duration_float
    45. 3.45. error_iter
    46. 3.46. error_type_id
    47. 3.47. euclidean_division
    48. 3.48. exact_size_is_empty
    49. 3.49. extra_log_consts
    50. 3.50. fd
    51. 3.51. fd_read
    52. 3.52. fixed_size_array
    53. 3.53. flt2dec
    54. 3.54. fmt_internals
    55. 3.55. fn_traits
    56. 3.56. fnbox
    57. 3.57. foo
    58. 3.58. forget_unsized
    59. 3.59. gen_future
    60. 3.60. generator_trait
    61. 3.61. hash_raw_entry
    62. 3.62. hash_set_entry
    63. 3.63. hashmap_internals
    64. 3.64. inner_deref
    65. 3.65. int_error_internals
    66. 3.66. int_error_matching
    67. 3.67. integer_atomics
    68. 3.68. ip
    69. 3.69. is_sorted
    70. 3.70. iter_nth_back
    71. 3.71. iter_once_with
    72. 3.72. libstd_io_internals
    73. 3.73. libstd_sys_internals
    74. 3.74. libstd_thread_internals
    75. 3.75. linked_list_extras
    76. 3.76. manually_drop_take
    77. 3.77. map_entry_replace
    78. 3.78. map_get_key_value
    79. 3.79. maybe_uninit_array
    80. 3.80. maybe_uninit_extra
    81. 3.81. maybe_uninit_ref
    82. 3.82. maybe_uninit_slice
    83. 3.83. n16
    84. 3.84. no_more_cas
    85. 3.85. once_is_completed
    86. 3.86. once_poison
    87. 3.87. option_flattening
    88. 3.88. option_xor
    89. 3.89. panic_abort
    90. 3.90. panic_info_message
    91. 3.91. panic_internals
    92. 3.92. panic_unwind
    93. 3.93. path_buf_capacity
    94. 3.94. pattern
    95. 3.95. pin_into_inner
    96. 3.96. print_internals
    97. 3.97. proc_macro_def_site
    98. 3.98. proc_macro_diagnostic
    99. 3.99. proc_macro_internals
    100. 3.100. proc_macro_quote
    101. 3.101. proc_macro_raw_ident
    102. 3.102. proc_macro_span
    103. 3.103. process_exitcode_placeholder
    104. 3.104. process_internals
    105. 3.105. profiler_runtime_lib
    106. 3.106. ptr_cast
    107. 3.107. ptr_internals
    108. 3.108. ptr_offset_from
    109. 3.109. ptr_wrapping_offset_from
    110. 3.110. range_is_empty
    111. 3.111. raw
    112. 3.112. raw_vec_internals
    113. 3.113. rc_into_raw_non_null
    114. 3.114. read_initializer
    115. 3.115. receiver_trait
    116. 3.116. renamed_spin_loop
    117. 3.117. repeat_generic_slice
    118. 3.118. result_map_or_else
    119. 3.119. reverse_bits
    120. 3.120. rt
    121. 3.121. rustc_private
    122. 3.122. sanitizer_runtime_lib
    123. 3.123. saturating_neg
    124. 3.124. seek_convenience
    125. 3.125. set_stdio
    126. 3.126. sgx_platform
    127. 3.127. shrink_to
    128. 3.128. slice_concat_ext
    129. 3.129. slice_index_methods
    130. 3.130. slice_internals
    131. 3.131. slice_iter_mut_as_slice
    132. 3.132. slice_partition_at_index
    133. 3.133. slice_partition_dedup
    134. 3.134. sort_internals
    135. 3.135. std_internals
    136. 3.136. stdsimd
    137. 3.137. step_trait
    138. 3.138. str_internals
    139. 3.139. termination_trait_lib
    140. 3.140. test
    141. 3.141. thread_local_internals
    142. 3.142. thread_spawn_unchecked
    143. 3.143. todo_macro
    144. 3.144. toowned_clone_into
    145. 3.145. trusted_len
    146. 3.146. try_reserve
    147. 3.147. try_trait
    148. 3.148. udp_peer_addr
    149. 3.149. unicode_internals
    150. 3.150. unicode_version
    151. 3.151. unsize
    152. 3.152. update_panic_count
    153. 3.153. vec_drain_as_slice
    154. 3.154. vec_remove_item
    155. 3.155. vec_resize_default
    156. 3.156. wait_timeout_until
    157. 3.157. wait_until
    158. 3.158. wasi_ext
    159. 3.159. weak_counts
    160. 3.160. weak_ptr_eq
    161. 3.161. windows_c
    162. 3.162. windows_file_type_ext
    163. 3.163. windows_handle
    164. 3.164. windows_net
    165. 3.165. windows_stdio
    166. 3.166. wrapping_int_impl
    167. 3.167. wrapping_next_power_of_two

The Rust Unstable Book

Language features