1. The Unstable Book
  2. 1. Compiler flags
    1. 1.1. linker_flavor
    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. alloc_error_handler
    10. 2.10. allocator_internals
    11. 2.11. allow_fail
    12. 2.12. allow_internal_unsafe
    13. 2.13. allow_internal_unstable
    14. 2.14. arbitrary_self_types
    15. 2.15. arm_target_feature
    16. 2.16. asm
    17. 2.17. associated_type_defaults
    18. 2.18. async_await
    19. 2.19. attr_literals
    20. 2.20. avx512_target_feature
    21. 2.21. box_patterns
    22. 2.22. box_syntax
    23. 2.23. catch_expr
    24. 2.24. cfg_target_has_atomic
    25. 2.25. cfg_target_thread_local
    26. 2.26. cfg_target_vendor
    27. 2.27. compiler_builtins
    28. 2.28. concat_idents
    29. 2.29. const_fn
    30. 2.30. const_let
    31. 2.31. crate_in_paths
    32. 2.32. crate_visibility_modifier
    33. 2.33. custom_attribute
    34. 2.34. custom_derive
    35. 2.35. decl_macro
    36. 2.36. default_type_parameter_fallback
    37. 2.37. doc_alias
    38. 2.38. doc_cfg
    39. 2.39. doc_keyword
    40. 2.40. doc_masked
    41. 2.41. doc_spotlight
    42. 2.42. dropck_eyepatch
    43. 2.43. dropck_parametricity
    44. 2.44. exclusive_range_pattern
    45. 2.45. exhaustive_patterns
    46. 2.46. existential_type
    47. 2.47. extern_absolute_paths
    48. 2.48. extern_in_paths
    49. 2.49. extern_prelude
    50. 2.50. extern_types
    51. 2.51. external_doc
    52. 2.52. format_args_nl
    53. 2.53. fundamental
    54. 2.54. generators
    55. 2.55. generic_associated_types
    56. 2.56. global_asm
    57. 2.57. hexagon_target_feature
    58. 2.58. if_while_or_patterns
    59. 2.59. in_band_lifetimes
    60. 2.60. infer_outlives_requirements
    61. 2.61. infer_static_outlives_requirements
    62. 2.62. intrinsics
    63. 2.63. irrefutable_let_patterns
    64. 2.64. label_break_value
    65. 2.65. lang_items
    66. 2.66. link_args
    67. 2.67. link_cfg
    68. 2.68. link_llvm_intrinsics
    69. 2.69. linkage
    70. 2.70. log_syntax
    71. 2.71. macro_at_most_once_rep
    72. 2.72. macro_literal_matcher
    73. 2.73. macro_vis_matcher
    74. 2.74. macros_in_extern
    75. 2.75. main
    76. 2.76. mips_target_feature
    77. 2.77. mmx_target_feature
    78. 2.78. naked_functions
    79. 2.79. needs_allocator
    80. 2.80. needs_panic_runtime
    81. 2.81. never_type
    82. 2.82. nll
    83. 2.83. no_core
    84. 2.84. no_debug
    85. 2.85. non_ascii_idents
    86. 2.86. non_exhaustive
    87. 2.87. non_modrs_mods
    88. 2.88. omit_gdb_pretty_printer_section
    89. 2.89. on_unimplemented
    90. 2.90. optin_builtin_traits
    91. 2.91. overlapping_marker_traits
    92. 2.92. panic_implementation
    93. 2.93. panic_runtime
    94. 2.94. pattern_parentheses
    95. 2.95. platform_intrinsics
    96. 2.96. plugin
    97. 2.97. plugin_registrar
    98. 2.98. powerpc_target_feature
    99. 2.99. prelude_import
    100. 2.100. proc_macro_expr
    101. 2.101. proc_macro_gen
    102. 2.102. proc_macro_mod
    103. 2.103. proc_macro_non_items
    104. 2.104. proc_macro_path_invoc
    105. 2.105. profiler_runtime
    106. 2.106. quote
    107. 2.107. raw_identifiers
    108. 2.108. repr_packed
    109. 2.109. repr_simd
    110. 2.110. repr128
    111. 2.111. rustc_attrs
    112. 2.112. rustc_const_unstable
    113. 2.113. rustc_diagnostic_macros
    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. thread_local
    126. 2.126. tool_attributes
    127. 2.127. tool_lints
    128. 2.128. trace_macros
    129. 2.129. trait_alias
    130. 2.130. trivial_bounds
    131. 2.131. type_ascription
    132. 2.132. unboxed_closures
    133. 2.133. underscore_imports
    134. 2.134. unsized_tuple_coercion
    135. 2.135. untagged_unions
    136. 2.136. unwind_attributes
    137. 2.137. use_extern_macros
    138. 2.138. used
  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_jemalloc
    6. 3.6. alloc_system
    7. 3.7. allocator_api
    8. 3.8. array_error_internals
    9. 3.9. as_cell
    10. 3.10. ascii_ctype
    11. 3.11. atomic_min_max
    12. 3.12. await_macro
    13. 3.13. box_into_raw_non_null
    14. 3.14. bufreader_buffer
    15. 3.15. bufreader_is_empty
    16. 3.16. bufreader_seek_relative
    17. 3.17. c_void_variant
    18. 3.18. cell_update
    19. 3.19. char_error_internals
    20. 3.20. coerce_unsized
    21. 3.21. compiler_builtins_lib
    22. 3.22. concat_idents_macro
    23. 3.23. const_int_ops
    24. 3.24. const_manually_drop_new
    25. 3.25. const_slice_as_ptr
    26. 3.26. const_slice_len
    27. 3.27. const_str_as_bytes
    28. 3.28. const_str_as_ptr
    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. core_intrinsics
    34. 3.34. core_panic
    35. 3.35. core_panic_info
    36. 3.36. core_private_bignum
    37. 3.37. core_private_diy_float
    38. 3.38. deadline_api
    39. 3.39. dec2flt
    40. 3.40. decode_utf8
    41. 3.41. derive_clone_copy
    42. 3.42. derive_eq
    43. 3.43. drain_filter
    44. 3.44. duration_as_u128
    45. 3.45. duration_getters
    46. 3.46. error_type_id
    47. 3.47. euclidean_division
    48. 3.48. exact_chunks
    49. 3.49. exact_size_is_empty
    50. 3.50. extra_log_consts
    51. 3.51. fd
    52. 3.52. fd_read
    53. 3.53. fixed_size_array
    54. 3.54. flt2dec
    55. 3.55. fmt_internals
    56. 3.56. fn_traits
    57. 3.57. fnbox
    58. 3.58. future_atomic_orderings
    59. 3.59. futures_api
    60. 3.60. gen_future
    61. 3.61. generator_trait
    62. 3.62. get_type_id
    63. 3.63. hashmap_internals
    64. 3.64. int_error_internals
    65. 3.65. int_to_from_bytes
    66. 3.66. integer_atomics
    67. 3.67. io
    68. 3.68. io_error_internals
    69. 3.69. ip
    70. 3.70. ip_constructors
    71. 3.71. iterator_find_map
    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. map_entry_replace
    77. 3.77. map_get_key_value
    78. 3.78. mpsc_select
    79. 3.79. n16
    80. 3.80. no_more_cas
    81. 3.81. no_panic_pow
    82. 3.82. offset_to
    83. 3.83. once_poison
    84. 3.84. option_replace
    85. 3.85. option_xor
    86. 3.86. panic_abort
    87. 3.87. panic_info_message
    88. 3.88. panic_internals
    89. 3.89. panic_unwind
    90. 3.90. pattern
    91. 3.91. pin
    92. 3.92. print_internals
    93. 3.93. proc_macro_diagnostic
    94. 3.94. proc_macro_internals
    95. 3.95. proc_macro_quote
    96. 3.96. proc_macro_raw_ident
    97. 3.97. proc_macro_span
    98. 3.98. process_exitcode_placeholder
    99. 3.99. process_internals
    100. 3.100. profiler_runtime_lib
    101. 3.101. ptr_internals
    102. 3.102. ptr_offset_from
    103. 3.103. ptr_wrapping_offset_from
    104. 3.104. range_contains
    105. 3.105. range_is_empty
    106. 3.106. raw
    107. 3.107. raw_vec_internals
    108. 3.108. read_initializer
    109. 3.109. refcell_map_split
    110. 3.110. refcell_replace_swap
    111. 3.111. repeat_generic_slice
    112. 3.112. reverse_bits
    113. 3.113. rt
    114. 3.114. rustc_private
    115. 3.115. rustc_stack_internals
    116. 3.116. rw_exact_all_at
    117. 3.117. sanitizer_runtime_lib
    118. 3.118. set_stdio
    119. 3.119. shrink_to
    120. 3.120. slice_align_to
    121. 3.121. slice_concat_ext
    122. 3.122. slice_index_methods
    123. 3.123. slice_internals
    124. 3.124. slice_sort_by_cached_key
    125. 3.125. sort_internals
    126. 3.126. split_ascii_whitespace
    127. 3.127. std_internals
    128. 3.128. stdsimd
    129. 3.129. step_trait
    130. 3.130. str_escape
    131. 3.131. str_internals
    132. 3.132. termination_trait_lib
    133. 3.133. test
    134. 3.134. thread_local_internals
    135. 3.135. toowned_clone_into
    136. 3.136. transpose_result
    137. 3.137. trusted_len
    138. 3.138. try_from
    139. 3.139. try_reserve
    140. 3.140. try_trait
    141. 3.141. unicode
    142. 3.142. unicode_internals
    143. 3.143. unicode_version
    144. 3.144. unsize
    145. 3.145. update_panic_count
    146. 3.146. vec_remove_item
    147. 3.147. vec_resize_default
    148. 3.148. vec_resize_with
    149. 3.149. wait_timeout_until
    150. 3.150. wait_until
    151. 3.151. windows_c
    152. 3.152. windows_file_type_ext
    153. 3.153. windows_handle
    154. 3.154. windows_net
    155. 3.155. windows_stdio
    156. 3.156. wrapping_int_impl
    157. 3.157. wrapping_next_power_of_two

Language features