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. avx512_target_feature
    20. 2.20. box_patterns
    21. 2.21. box_syntax
    22. 2.22. cfg_target_has_atomic
    23. 2.23. cfg_target_thread_local
    24. 2.24. cfg_target_vendor
    25. 2.25. compiler_builtins
    26. 2.26. concat_idents
    27. 2.27. const_compare_raw_pointers
    28. 2.28. const_fn
    29. 2.29. const_fn_union
    30. 2.30. const_let
    31. 2.31. const_panic
    32. 2.32. const_raw_ptr_deref
    33. 2.33. const_raw_ptr_to_usize_cast
    34. 2.34. const_transmute
    35. 2.35. crate_visibility_modifier
    36. 2.36. custom_attribute
    37. 2.37. custom_derive
    38. 2.38. custom_inner_attributes
    39. 2.39. custom_test_frameworks
    40. 2.40. decl_macro
    41. 2.41. default_type_parameter_fallback
    42. 2.42. doc_alias
    43. 2.43. doc_cfg
    44. 2.44. doc_keyword
    45. 2.45. doc_masked
    46. 2.46. doc_spotlight
    47. 2.47. dropck_eyepatch
    48. 2.48. dropck_parametricity
    49. 2.49. exclusive_range_pattern
    50. 2.50. exhaustive_integer_patterns
    51. 2.51. exhaustive_patterns
    52. 2.52. existential_type
    53. 2.53. extern_in_paths
    54. 2.54. extern_types
    55. 2.55. external_doc
    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. if_while_or_patterns
    63. 2.63. impl_header_lifetime_elision
    64. 2.64. in_band_lifetimes
    65. 2.65. infer_outlives_requirements
    66. 2.66. infer_static_outlives_requirements
    67. 2.67. intrinsics
    68. 2.68. irrefutable_let_patterns
    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. log_syntax
    76. 2.76. macro_at_most_once_rep
    77. 2.77. macro_literal_matcher
    78. 2.78. macros_in_extern
    79. 2.79. main
    80. 2.80. min_const_fn
    81. 2.81. mips_target_feature
    82. 2.82. mmx_target_feature
    83. 2.83. naked_functions
    84. 2.84. needs_allocator
    85. 2.85. needs_panic_runtime
    86. 2.86. never_type
    87. 2.87. nll
    88. 2.88. no_core
    89. 2.89. no_debug
    90. 2.90. non_ascii_idents
    91. 2.91. non_exhaustive
    92. 2.92. non_modrs_mods
    93. 2.93. omit_gdb_pretty_printer_section
    94. 2.94. on_unimplemented
    95. 2.95. optin_builtin_traits
    96. 2.96. overlapping_marker_traits
    97. 2.97. panic_implementation
    98. 2.98. panic_runtime
    99. 2.99. pattern_parentheses
    100. 2.100. platform_intrinsics
    101. 2.101. plugin
    102. 2.102. plugin_registrar
    103. 2.103. powerpc_target_feature
    104. 2.104. prelude_import
    105. 2.105. proc_macro_expr
    106. 2.106. proc_macro_gen
    107. 2.107. proc_macro_mod
    108. 2.108. proc_macro_non_items
    109. 2.109. profiler_runtime
    110. 2.110. quote
    111. 2.111. repr_packed
    112. 2.112. repr_simd
    113. 2.113. repr128
    114. 2.114. rustc_attrs
    115. 2.115. rustc_const_unstable
    116. 2.116. rustc_diagnostic_macros
    117. 2.117. sanitizer_runtime
    118. 2.118. self_in_typedefs
    119. 2.119. self_struct_ctor
    120. 2.120. simd_ffi
    121. 2.121. slice_patterns
    122. 2.122. specialization
    123. 2.123. sse4a_target_feature
    124. 2.124. staged_api
    125. 2.125. start
    126. 2.126. static_nobundle
    127. 2.127. stmt_expr_attributes
    128. 2.128. structural_match
    129. 2.129. tbm_target_feature
    130. 2.130. thread_local
    131. 2.131. tool_lints
    132. 2.132. trace_macros
    133. 2.133. trait_alias
    134. 2.134. trivial_bounds
    135. 2.135. try_blocks
    136. 2.136. type_ascription
    137. 2.137. unboxed_closures
    138. 2.138. underscore_imports
    139. 2.139. uniform_paths
    140. 2.140. unrestricted_attribute_tokens
    141. 2.141. unsized_locals
    142. 2.142. unsized_tuple_coercion
    143. 2.143. untagged_unions
    144. 2.144. unwind_attributes
    145. 2.145. 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_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. atomic_min_max
    11. 3.11. await_macro
    12. 3.12. box_into_raw_non_null
    13. 3.13. bufreader_buffer
    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. coerce_unsized
    19. 3.19. compiler_builtins_lib
    20. 3.20. concat_idents_macro
    21. 3.21. const_convert_id
    22. 3.22. const_int_conversion
    23. 3.23. const_int_ops
    24. 3.24. const_int_overflowing
    25. 3.25. const_int_rotate
    26. 3.26. const_int_sign
    27. 3.27. const_int_wrapping
    28. 3.28. const_ip
    29. 3.29. const_manually_drop_new
    30. 3.30. const_slice_as_ptr
    31. 3.31. const_slice_len
    32. 3.32. const_str_as_bytes
    33. 3.33. const_str_as_ptr
    34. 3.34. const_str_len
    35. 3.35. const_string_new
    36. 3.36. const_type_id
    37. 3.37. const_vec_new
    38. 3.38. convert_id
    39. 3.39. core_intrinsics
    40. 3.40. core_panic
    41. 3.41. core_panic_info
    42. 3.42. core_private_bignum
    43. 3.43. core_private_diy_float
    44. 3.44. deadline_api
    45. 3.45. dec2flt
    46. 3.46. derive_clone_copy
    47. 3.47. derive_eq
    48. 3.48. drain_filter
    49. 3.49. duration_as_u128
    50. 3.50. duration_getters
    51. 3.51. error_type_id
    52. 3.52. euclidean_division
    53. 3.53. exact_chunks
    54. 3.54. exact_size_is_empty
    55. 3.55. extra_log_consts
    56. 3.56. fd
    57. 3.57. fd_read
    58. 3.58. fixed_size_array
    59. 3.59. flt2dec
    60. 3.60. fmt_internals
    61. 3.61. fn_traits
    62. 3.62. fnbox
    63. 3.63. futures_api
    64. 3.64. gen_future
    65. 3.65. generator_trait
    66. 3.66. get_type_id
    67. 3.67. hashmap_internals
    68. 3.68. inner_deref
    69. 3.69. int_error_internals
    70. 3.70. int_to_from_bytes
    71. 3.71. integer_atomics
    72. 3.72. ip
    73. 3.73. libstd_io_internals
    74. 3.74. libstd_sys_internals
    75. 3.75. libstd_thread_internals
    76. 3.76. linked_list_extras
    77. 3.77. map_entry_replace
    78. 3.78. map_get_key_value
    79. 3.79. mpsc_select
    80. 3.80. n16
    81. 3.81. no_more_cas
    82. 3.82. no_panic_pow
    83. 3.83. once_is_completed
    84. 3.84. once_poison
    85. 3.85. option_replace
    86. 3.86. option_xor
    87. 3.87. panic_abort
    88. 3.88. panic_info_message
    89. 3.89. panic_internals
    90. 3.90. panic_unwind
    91. 3.91. pattern
    92. 3.92. pin
    93. 3.93. print_internals
    94. 3.94. proc_macro_diagnostic
    95. 3.95. proc_macro_internals
    96. 3.96. proc_macro_quote
    97. 3.97. proc_macro_raw_ident
    98. 3.98. proc_macro_span
    99. 3.99. process_exitcode_placeholder
    100. 3.100. process_internals
    101. 3.101. profiler_runtime_lib
    102. 3.102. ptr_internals
    103. 3.103. ptr_offset_from
    104. 3.104. ptr_wrapping_offset_from
    105. 3.105. range_contains
    106. 3.106. range_is_empty
    107. 3.107. raw
    108. 3.108. raw_vec_internals
    109. 3.109. read_initializer
    110. 3.110. refcell_map_split
    111. 3.111. refcell_replace_swap
    112. 3.112. repeat_generic_slice
    113. 3.113. result_map_or_else
    114. 3.114. reverse_bits
    115. 3.115. rt
    116. 3.116. rustc_private
    117. 3.117. rustc_stack_internals
    118. 3.118. rw_exact_all_at
    119. 3.119. sanitizer_runtime_lib
    120. 3.120. set_stdio
    121. 3.121. shrink_to
    122. 3.122. slice_concat_ext
    123. 3.123. slice_index_methods
    124. 3.124. slice_internals
    125. 3.125. slice_sort_by_cached_key
    126. 3.126. sort_internals
    127. 3.127. split_ascii_whitespace
    128. 3.128. std_internals
    129. 3.129. stdsimd
    130. 3.130. step_trait
    131. 3.131. str_escape
    132. 3.132. str_internals
    133. 3.133. termination_trait_lib
    134. 3.134. test
    135. 3.135. thread_local_internals
    136. 3.136. toowned_clone_into
    137. 3.137. transpose_result
    138. 3.138. trusted_len
    139. 3.139. try_from
    140. 3.140. try_reserve
    141. 3.141. try_trait
    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