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. asm
    19. 2.19. associated_type_bounds
    20. 2.20. associated_type_defaults
    21. 2.21. async_await
    22. 2.22. avx512_target_feature
    23. 2.23. await_macro
    24. 2.24. bind_by_move_pattern_guards
    25. 2.25. box_patterns
    26. 2.26. box_syntax
    27. 2.27. c_variadic
    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. concat_idents
    33. 2.33. const_compare_raw_pointers
    34. 2.34. const_constructor
    35. 2.35. const_fn
    36. 2.36. const_fn_union
    37. 2.37. const_generics
    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. dropck_parametricity
    55. 2.55. exclusive_range_pattern
    56. 2.56. exhaustive_patterns
    57. 2.57. existential_type
    58. 2.58. extern_types
    59. 2.59. external_doc
    60. 2.60. f16c_target_feature
    61. 2.61. ffi_returns_twice
    62. 2.62. format_args_nl
    63. 2.63. fundamental
    64. 2.64. generators
    65. 2.65. generic_associated_types
    66. 2.66. global_asm
    67. 2.67. hexagon_target_feature
    68. 2.68. impl_trait_in_bindings
    69. 2.69. in_band_lifetimes
    70. 2.70. infer_static_outlives_requirements
    71. 2.71. intrinsics
    72. 2.72. label_break_value
    73. 2.73. lang_items
    74. 2.74. let_chains
    75. 2.75. link_args
    76. 2.76. link_cfg
    77. 2.77. link_llvm_intrinsics
    78. 2.78. linkage
    79. 2.79. lint_reasons
    80. 2.80. log_syntax
    81. 2.81. macros_in_extern
    82. 2.82. main
    83. 2.83. marker_trait_attr
    84. 2.84. member_constraints
    85. 2.85. mips_target_feature
    86. 2.86. mmx_target_feature
    87. 2.87. movbe_target_feature
    88. 2.88. naked_functions
    89. 2.89. needs_panic_runtime
    90. 2.90. never_type
    91. 2.91. nll
    92. 2.92. no_core
    93. 2.93. no_debug
    94. 2.94. non_ascii_idents
    95. 2.95. non_exhaustive
    96. 2.96. omit_gdb_pretty_printer_section
    97. 2.97. on_unimplemented
    98. 2.98. optimize_attribute
    99. 2.99. optin_builtin_traits
    100. 2.100. overlapping_marker_traits
    101. 2.101. panic_runtime
    102. 2.102. param_attrs
    103. 2.103. platform_intrinsics
    104. 2.104. plugin
    105. 2.105. plugin_registrar
    106. 2.106. powerpc_target_feature
    107. 2.107. precise_pointer_size_matching
    108. 2.108. prelude_import
    109. 2.109. proc_macro_hygiene
    110. 2.110. profiler_runtime
    111. 2.111. re_rebalance_coherence
    112. 2.112. repr_simd
    113. 2.113. repr128
    114. 2.114. rtm_target_feature
    115. 2.115. rustc_attrs
    116. 2.116. rustc_const_unstable
    117. 2.117. rustc_diagnostic_macros
    118. 2.118. sanitizer_runtime
    119. 2.119. simd_ffi
    120. 2.120. slice_patterns
    121. 2.121. specialization
    122. 2.122. sse4a_target_feature
    123. 2.123. staged_api
    124. 2.124. start
    125. 2.125. static_nobundle
    126. 2.126. stmt_expr_attributes
    127. 2.127. structural_match
    128. 2.128. tbm_target_feature
    129. 2.129. test_2018_feature
    130. 2.130. thread_local
    131. 2.131. trace_macros
    132. 2.132. trait_alias
    133. 2.133. transparent_enums
    134. 2.134. transparent_unions
    135. 2.135. trivial_bounds
    136. 2.136. try_blocks
    137. 2.137. type_ascription
    138. 2.138. unboxed_closures
    139. 2.139. unsized_locals
    140. 2.140. unsized_tuple_coercion
    141. 2.141. untagged_unions
    142. 2.142. unwind_attributes
    143. 2.143. 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. atomic_min_max
    8. 3.8. bound_cloned
    9. 3.9. box_into_pin
    10. 3.10. box_into_raw_non_null
    11. 3.11. bufreader_seek_relative
    12. 3.12. c_void_variant
    13. 3.13. cell_update
    14. 3.14. char_error_internals
    15. 3.15. checked_duration_since
    16. 3.16. clamp
    17. 3.17. coerce_unsized
    18. 3.18. compiler_builtins_lib
    19. 3.19. concat_idents_macro
    20. 3.20. const_cstr_unchecked
    21. 3.21. const_int_conversion
    22. 3.22. const_int_sign
    23. 3.23. const_saturating_int_methods
    24. 3.24. const_slice_len
    25. 3.25. const_str_as_bytes
    26. 3.26. const_str_len
    27. 3.27. const_string_new
    28. 3.28. const_type_id
    29. 3.29. const_vec_new
    30. 3.30. core_intrinsics
    31. 3.31. core_panic
    32. 3.32. core_panic_info
    33. 3.33. core_private_bignum
    34. 3.34. core_private_diy_float
    35. 3.35. deadline_api
    36. 3.36. dec2flt
    37. 3.37. derive_clone_copy
    38. 3.38. derive_eq
    39. 3.39. dispatch_from_dyn
    40. 3.40. drain_filter
    41. 3.41. duration_constants
    42. 3.42. duration_float
    43. 3.43. error_iter
    44. 3.44. error_type_id
    45. 3.45. euclidean_division
    46. 3.46. exact_size_is_empty
    47. 3.47. extra_log_consts
    48. 3.48. fd
    49. 3.49. fd_read
    50. 3.50. fixed_size_array
    51. 3.51. flt2dec
    52. 3.52. fmt_internals
    53. 3.53. fn_traits
    54. 3.54. foo
    55. 3.55. forget_unsized
    56. 3.56. gen_future
    57. 3.57. generator_trait
    58. 3.58. hash_raw_entry
    59. 3.59. hash_set_entry
    60. 3.60. hashmap_internals
    61. 3.61. inner_deref
    62. 3.62. int_error_internals
    63. 3.63. int_error_matching
    64. 3.64. integer_atomics
    65. 3.65. ip
    66. 3.66. is_sorted
    67. 3.67. iter_once_with
    68. 3.68. libstd_io_internals
    69. 3.69. libstd_sys_internals
    70. 3.70. libstd_thread_internals
    71. 3.71. linked_list_extras
    72. 3.72. manually_drop_take
    73. 3.73. map_entry_replace
    74. 3.74. map_get_key_value
    75. 3.75. maybe_uninit_array
    76. 3.76. maybe_uninit_extra
    77. 3.77. maybe_uninit_ref
    78. 3.78. maybe_uninit_slice
    79. 3.79. mem_take
    80. 3.80. n16
    81. 3.81. no_more_cas
    82. 3.82. once_is_completed
    83. 3.83. once_poison
    84. 3.84. option_flattening
    85. 3.85. panic_abort
    86. 3.86. panic_info_message
    87. 3.87. panic_internals
    88. 3.88. panic_unwind
    89. 3.89. path_buf_capacity
    90. 3.90. pattern
    91. 3.91. pin_into_inner
    92. 3.92. print_internals
    93. 3.93. proc_macro_def_site
    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_cast
    103. 3.103. ptr_internals
    104. 3.104. ptr_offset_from
    105. 3.105. ptr_wrapping_offset_from
    106. 3.106. range_is_empty
    107. 3.107. raw
    108. 3.108. raw_vec_internals
    109. 3.109. rc_into_raw_non_null
    110. 3.110. read_initializer
    111. 3.111. receiver_trait
    112. 3.112. renamed_spin_loop
    113. 3.113. repeat_generic_slice
    114. 3.114. result_map_or_else
    115. 3.115. rt
    116. 3.116. rustc_private
    117. 3.117. sanitizer_runtime_lib
    118. 3.118. saturating_neg
    119. 3.119. seek_convenience
    120. 3.120. set_stdio
    121. 3.121. sgx_platform
    122. 3.122. shrink_to
    123. 3.123. slice_concat_ext
    124. 3.124. slice_from_raw_parts
    125. 3.125. slice_index_methods
    126. 3.126. slice_internals
    127. 3.127. slice_iter_mut_as_slice
    128. 3.128. slice_partition_at_index
    129. 3.129. slice_partition_dedup
    130. 3.130. sort_internals
    131. 3.131. std_internals
    132. 3.132. stdsimd
    133. 3.133. step_trait
    134. 3.134. str_internals
    135. 3.135. termination_trait_lib
    136. 3.136. test
    137. 3.137. thread_local_internals
    138. 3.138. thread_spawn_unchecked
    139. 3.139. todo_macro
    140. 3.140. toowned_clone_into
    141. 3.141. trusted_len
    142. 3.142. try_reserve
    143. 3.143. try_trait
    144. 3.144. udp_peer_addr
    145. 3.145. unicode_internals
    146. 3.146. unicode_version
    147. 3.147. unsize
    148. 3.148. update_panic_count
    149. 3.149. vec_drain_as_slice
    150. 3.150. vec_remove_item
    151. 3.151. vec_resize_default
    152. 3.152. wait_timeout_until
    153. 3.153. wait_until
    154. 3.154. wasi_ext
    155. 3.155. weak_counts
    156. 3.156. weak_into_raw
    157. 3.157. weak_ptr_eq
    158. 3.158. windows_c
    159. 3.159. windows_file_type_ext
    160. 3.160. windows_handle
    161. 3.161. windows_net
    162. 3.162. windows_stdio
    163. 3.163. wrapping_int_impl
    164. 3.164. wrapping_next_power_of_two

The Rust Unstable Book

Library Features