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. bind_by_move_pattern_guards
    22. 2.22. box_patterns
    23. 2.23. box_syntax
    24. 2.24. cfg_target_has_atomic
    25. 2.25. cfg_target_thread_local
    26. 2.26. cmpxchg16b_target_feature
    27. 2.27. compiler_builtins
    28. 2.28. concat_idents
    29. 2.29. const_compare_raw_pointers
    30. 2.30. const_fn
    31. 2.31. const_fn_union
    32. 2.32. const_generics
    33. 2.33. const_panic
    34. 2.34. const_raw_ptr_deref
    35. 2.35. const_raw_ptr_to_usize_cast
    36. 2.36. const_transmute
    37. 2.37. crate_visibility_modifier
    38. 2.38. custom_attribute
    39. 2.39. custom_inner_attributes
    40. 2.40. custom_test_frameworks
    41. 2.41. decl_macro
    42. 2.42. default_type_parameter_fallback
    43. 2.43. doc_alias
    44. 2.44. doc_cfg
    45. 2.45. doc_keyword
    46. 2.46. doc_masked
    47. 2.47. doc_spotlight
    48. 2.48. dropck_eyepatch
    49. 2.49. dropck_parametricity
    50. 2.50. exclusive_range_pattern
    51. 2.51. exhaustive_patterns
    52. 2.52. existential_type
    53. 2.53. extern_types
    54. 2.54. external_doc
    55. 2.55. ffi_returns_twice
    56. 2.56. format_args_nl
    57. 2.57. fundamental
    58. 2.58. generators
    59. 2.59. generic_associated_types
    60. 2.60. global_asm
    61. 2.61. hexagon_target_feature
    62. 2.62. impl_trait_in_bindings
    63. 2.63. in_band_lifetimes
    64. 2.64. infer_static_outlives_requirements
    65. 2.65. intrinsics
    66. 2.66. label_break_value
    67. 2.67. lang_items
    68. 2.68. link_args
    69. 2.69. link_cfg
    70. 2.70. link_llvm_intrinsics
    71. 2.71. linkage
    72. 2.72. lint_reasons
    73. 2.73. log_syntax
    74. 2.74. macros_in_extern
    75. 2.75. main
    76. 2.76. marker_trait_attr
    77. 2.77. mips_target_feature
    78. 2.78. mmx_target_feature
    79. 2.79. movbe_target_feature
    80. 2.80. naked_functions
    81. 2.81. needs_allocator
    82. 2.82. needs_panic_runtime
    83. 2.83. never_type
    84. 2.84. nll
    85. 2.85. no_core
    86. 2.86. no_debug
    87. 2.87. non_ascii_idents
    88. 2.88. non_exhaustive
    89. 2.89. omit_gdb_pretty_printer_section
    90. 2.90. on_unimplemented
    91. 2.91. optimize_attribute
    92. 2.92. optin_builtin_traits
    93. 2.93. overlapping_marker_traits
    94. 2.94. panic_runtime
    95. 2.95. platform_intrinsics
    96. 2.96. plugin
    97. 2.97. plugin_registrar
    98. 2.98. powerpc_target_feature
    99. 2.99. precise_pointer_size_matching
    100. 2.100. prelude_import
    101. 2.101. proc_macro_hygiene
    102. 2.102. profiler_runtime
    103. 2.103. re_rebalance_coherence
    104. 2.104. repr_align_enum
    105. 2.105. repr_simd
    106. 2.106. repr128
    107. 2.107. rustc_attrs
    108. 2.108. rustc_const_unstable
    109. 2.109. rustc_diagnostic_macros
    110. 2.110. sanitizer_runtime
    111. 2.111. simd_ffi
    112. 2.112. slice_patterns
    113. 2.113. specialization
    114. 2.114. sse4a_target_feature
    115. 2.115. staged_api
    116. 2.116. start
    117. 2.117. static_nobundle
    118. 2.118. stmt_expr_attributes
    119. 2.119. structural_match
    120. 2.120. tbm_target_feature
    121. 2.121. test_2018_feature
    122. 2.122. thread_local
    123. 2.123. trace_macros
    124. 2.124. trait_alias
    125. 2.125. trivial_bounds
    126. 2.126. try_blocks
    127. 2.127. type_alias_enum_variants
    128. 2.128. type_ascription
    129. 2.129. unboxed_closures
    130. 2.130. underscore_const_names
    131. 2.131. unsized_locals
    132. 2.132. unsized_tuple_coercion
    133. 2.133. untagged_unions
    134. 2.134. unwind_attributes
    135. 2.135. wasm_target_feature
  4. 3. Library Features
    1. 3.1. align_offset
    2. 3.2. alloc
    3. 3.3. alloc_error_hook
    4. 3.4. alloc_internals
    5. 3.5. alloc_layout_extra
    6. 3.6. allocator_api
    7. 3.7. array_error_internals
    8. 3.8. as_cell
    9. 3.9. atomic_min_max
    10. 3.10. await_macro
    11. 3.11. box_into_pin
    12. 3.12. box_into_raw_non_null
    13. 3.13. bufreader_buffer
    14. 3.14. bufreader_seek_relative
    15. 3.15. c_variadic
    16. 3.16. c_void_variant
    17. 3.17. cell_update
    18. 3.18. char_error_internals
    19. 3.19. checked_duration_since
    20. 3.20. coerce_unsized
    21. 3.21. compiler_builtins_lib
    22. 3.22. concat_idents_macro
    23. 3.23. const_cstr_unchecked
    24. 3.24. const_int_conversion
    25. 3.25. const_needs_drop
    26. 3.26. const_saturating_int_methods
    27. 3.27. const_slice_len
    28. 3.28. const_str_as_bytes
    29. 3.29. const_str_len
    30. 3.30. const_string_new
    31. 3.31. const_type_id
    32. 3.32. const_vec_new
    33. 3.33. copied
    34. 3.34. copy_within
    35. 3.35. copysign
    36. 3.36. core_intrinsics
    37. 3.37. core_panic
    38. 3.38. core_panic_info
    39. 3.39. core_private_bignum
    40. 3.40. core_private_diy_float
    41. 3.41. deadline_api
    42. 3.42. dec2flt
    43. 3.43. derive_clone_copy
    44. 3.44. derive_eq
    45. 3.45. dispatch_from_dyn
    46. 3.46. drain_filter
    47. 3.47. duration_constants
    48. 3.48. duration_float
    49. 3.49. error_iter
    50. 3.50. euclidean_division
    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. flt2dec
    57. 3.57. fmt_internals
    58. 3.58. fn_traits
    59. 3.59. fnbox
    60. 3.60. forget_unsized
    61. 3.61. futures_api
    62. 3.62. gen_future
    63. 3.63. generator_trait
    64. 3.64. hash_raw_entry
    65. 3.65. hashmap_internals
    66. 3.66. inner_deref
    67. 3.67. int_error_internals
    68. 3.68. int_error_matching
    69. 3.69. integer_atomics
    70. 3.70. iovec
    71. 3.71. ip
    72. 3.72. is_sorted
    73. 3.73. iter_copied
    74. 3.74. iter_nth_back
    75. 3.75. iter_once_with
    76. 3.76. libstd_io_internals
    77. 3.77. libstd_sys_internals
    78. 3.78. libstd_thread_internals
    79. 3.79. linked_list_extras
    80. 3.80. manually_drop_take
    81. 3.81. map_entry_replace
    82. 3.82. map_get_key_value
    83. 3.83. maybe_uninit
    84. 3.84. maybe_uninit_array
    85. 3.85. maybe_uninit_ref
    86. 3.86. maybe_uninit_slice
    87. 3.87. mpsc_select
    88. 3.88. n16
    89. 3.89. no_more_cas
    90. 3.90. once_is_completed
    91. 3.91. once_poison
    92. 3.92. option_xor
    93. 3.93. panic_abort
    94. 3.94. panic_info_message
    95. 3.95. panic_internals
    96. 3.96. panic_unwind
    97. 3.97. path_buf_capacity
    98. 3.98. pattern
    99. 3.99. print_internals
    100. 3.100. proc_macro_def_site
    101. 3.101. proc_macro_diagnostic
    102. 3.102. proc_macro_internals
    103. 3.103. proc_macro_quote
    104. 3.104. proc_macro_raw_ident
    105. 3.105. proc_macro_span
    106. 3.106. process_exitcode_placeholder
    107. 3.107. process_internals
    108. 3.108. profiler_runtime_lib
    109. 3.109. ptr_hash
    110. 3.110. ptr_internals
    111. 3.111. ptr_offset_from
    112. 3.112. ptr_wrapping_offset_from
    113. 3.113. range_contains
    114. 3.114. range_is_empty
    115. 3.115. raw
    116. 3.116. raw_vec_internals
    117. 3.117. rc_into_raw_non_null
    118. 3.118. read_initializer
    119. 3.119. receiver_trait
    120. 3.120. refcell_map_split
    121. 3.121. refcell_replace_swap
    122. 3.122. renamed_spin_loop
    123. 3.123. repeat_generic_slice
    124. 3.124. result_map_or_else
    125. 3.125. reverse_bits
    126. 3.126. rt
    127. 3.127. rustc_private
    128. 3.128. sanitizer_runtime_lib
    129. 3.129. set_stdio
    130. 3.130. sgx_platform
    131. 3.131. shrink_to
    132. 3.132. slice_concat_ext
    133. 3.133. slice_index_methods
    134. 3.134. slice_internals
    135. 3.135. slice_partition_dedup
    136. 3.136. sort_internals
    137. 3.137. std_internals
    138. 3.138. stdsimd
    139. 3.139. step_trait
    140. 3.140. str_as_mut_ptr
    141. 3.141. str_internals
    142. 3.142. termination_trait_lib
    143. 3.143. test
    144. 3.144. thread_local_internals
    145. 3.145. thread_spawn_unchecked
    146. 3.146. toowned_clone_into
    147. 3.147. trusted_len
    148. 3.148. try_reserve
    149. 3.149. try_trait
    150. 3.150. unicode_internals
    151. 3.151. unicode_version
    152. 3.152. unsize
    153. 3.153. update_panic_count
    154. 3.154. vec_remove_item
    155. 3.155. vec_resize_default
    156. 3.156. vecdeque_rotate
    157. 3.157. wait_timeout_until
    158. 3.158. wait_until
    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

Language features