The Unstable Book
1.
Compiler flags
1.1.
emit_stack_sizes
1.2.
profile
2.
Language features
2.1.
aarch64_target_feature
2.2.
abi_amdgpu_kernel
2.3.
abi_msp430_interrupt
2.4.
abi_ptx
2.5.
abi_thiscall
2.6.
abi_unadjusted
2.7.
abi_vectorcall
2.8.
abi_x86_interrupt
2.9.
adx_target_feature
2.10.
alloc_error_handler
2.11.
allocator_internals
2.12.
allow_fail
2.13.
allow_internal_unsafe
2.14.
allow_internal_unstable
2.15.
arbitrary_enum_discriminant
2.16.
arbitrary_self_types
2.17.
arm_target_feature
2.18.
associated_type_bounds
2.19.
associated_type_defaults
2.20.
async_closure
2.21.
avx512_target_feature
2.22.
box_patterns
2.23.
box_syntax
2.24.
c_variadic
2.25.
cfg_doctest
2.26.
cfg_target_has_atomic
2.27.
cfg_target_thread_local
2.28.
cmpxchg16b_target_feature
2.29.
compiler_builtins
2.30.
const_compare_raw_pointers
2.31.
const_constructor
2.32.
const_fn
2.33.
const_fn_union
2.34.
const_generics
2.35.
const_in_array_repeat_expressions
2.36.
const_panic
2.37.
const_raw_ptr_deref
2.38.
const_raw_ptr_to_usize_cast
2.39.
const_transmute
2.40.
crate_visibility_modifier
2.41.
custom_attribute
2.42.
custom_inner_attributes
2.43.
custom_test_frameworks
2.44.
decl_macro
2.45.
default_type_parameter_fallback
2.46.
doc_alias
2.47.
doc_cfg
2.48.
doc_keyword
2.49.
doc_masked
2.50.
doc_spotlight
2.51.
dropck_eyepatch
2.52.
exclusive_range_pattern
2.53.
exhaustive_patterns
2.54.
extern_types
2.55.
external_doc
2.56.
f16c_target_feature
2.57.
ffi_returns_twice
2.58.
fundamental
2.59.
generators
2.60.
generic_associated_types
2.61.
hexagon_target_feature
2.62.
impl_trait_in_bindings
2.63.
in_band_lifetimes
2.64.
infer_static_outlives_requirements
2.65.
intrinsics
2.66.
label_break_value
2.67.
lang_items
2.68.
let_chains
2.69.
link_args
2.70.
link_cfg
2.71.
link_llvm_intrinsics
2.72.
linkage
2.73.
lint_reasons
2.74.
macros_in_extern
2.75.
main
2.76.
marker_trait_attr
2.77.
member_constraints
2.78.
mips_target_feature
2.79.
mmx_target_feature
2.80.
movbe_target_feature
2.81.
naked_functions
2.82.
needs_panic_runtime
2.83.
never_type
2.84.
nll
2.85.
no_core
2.86.
no_debug
2.87.
non_ascii_idents
2.88.
non_exhaustive
2.89.
omit_gdb_pretty_printer_section
2.90.
on_unimplemented
2.91.
optimize_attribute
2.92.
optin_builtin_traits
2.93.
or_patterns
2.94.
overlapping_marker_traits
2.95.
panic_runtime
2.96.
platform_intrinsics
2.97.
plugin
2.98.
plugin_registrar
2.99.
powerpc_target_feature
2.100.
precise_pointer_size_matching
2.101.
prelude_import
2.102.
proc_macro_hygiene
2.103.
profiler_runtime
2.104.
re_rebalance_coherence
2.105.
repr_simd
2.106.
repr128
2.107.
rtm_target_feature
2.108.
rustc_attrs
2.109.
rustc_const_unstable
2.110.
rustc_private
2.111.
sanitizer_runtime
2.112.
simd_ffi
2.113.
slice_patterns
2.114.
specialization
2.115.
sse4a_target_feature
2.116.
staged_api
2.117.
start
2.118.
static_nobundle
2.119.
stmt_expr_attributes
2.120.
structural_match
2.121.
tbm_target_feature
2.122.
test_2018_feature
2.123.
thread_local
2.124.
trait_alias
2.125.
transparent_enums
2.126.
transparent_unions
2.127.
trivial_bounds
2.128.
try_blocks
2.129.
type_alias_impl_trait
2.130.
type_ascription
2.131.
unboxed_closures
2.132.
unsized_locals
2.133.
unsized_tuple_coercion
2.134.
untagged_unions
2.135.
unwind_attributes
2.136.
wasm_target_feature
3.
Library Features
3.1.
alloc_error_hook
3.2.
alloc_internals
3.3.
alloc_layout_extra
3.4.
alloc_prelude
3.5.
allocator_api
3.6.
array_error_internals
3.7.
asm
3.8.
atomic_min_max
3.9.
backtrace
3.10.
bool_to_option
3.11.
bound_cloned
3.12.
box_into_pin
3.13.
box_into_raw_non_null
3.14.
boxed_slice_try_from
3.15.
bufreader_seek_relative
3.16.
c_void_variant
3.17.
cell_update
3.18.
char_error_internals
3.19.
clamp
3.20.
cmp_min_max_by
3.21.
coerce_unsized
3.22.
compiler_builtins_lib
3.23.
concat_idents
3.24.
const_cstr_unchecked
3.25.
const_generic_impls_guard
3.26.
const_int_conversion
3.27.
const_int_sign
3.28.
const_saturating_int_methods
3.29.
const_slice_len
3.30.
const_str_as_bytes
3.31.
const_str_len
3.32.
const_string_new
3.33.
const_type_id
3.34.
const_type_name
3.35.
const_vec_new
3.36.
container_error_extra
3.37.
core_intrinsics
3.38.
core_panic
3.39.
core_panic_info
3.40.
core_private_bignum
3.41.
core_private_diy_float
3.42.
deadline_api
3.43.
debug_map_key_value
3.44.
dec2flt
3.45.
derive_clone_copy
3.46.
derive_eq
3.47.
dispatch_from_dyn
3.48.
div_duration
3.49.
drain_filter
3.50.
duration_constants
3.51.
error_iter
3.52.
error_type_id
3.53.
exact_size_is_empty
3.54.
extra_log_consts
3.55.
fd
3.56.
fd_read
3.57.
fixed_size_array
3.58.
float_to_from_bytes
3.59.
flt2dec
3.60.
fmt_internals
3.61.
fn_traits
3.62.
foo
3.63.
forget_unsized
3.64.
format_args_nl
3.65.
gen_future
3.66.
generator_trait
3.67.
get_mut_unchecked
3.68.
global_asm
3.69.
hash_raw_entry
3.70.
hash_set_entry
3.71.
hashmap_internals
3.72.
inner_deref
3.73.
int_error_internals
3.74.
int_error_matching
3.75.
integer_atomics
3.76.
internal_uninit_const
3.77.
io_slice_advance
3.78.
ip
3.79.
is_sorted
3.80.
iter_is_partitioned
3.81.
iter_once_with
3.82.
iter_order_by
3.83.
iter_partition_in_place
3.84.
liballoc_internals
3.85.
libstd_io_internals
3.86.
libstd_sys_internals
3.87.
libstd_thread_internals
3.88.
linked_list_extras
3.89.
log_syntax
3.90.
manually_drop_take
3.91.
map_entry_replace
3.92.
map_get_key_value
3.93.
maybe_uninit_extra
3.94.
maybe_uninit_ref
3.95.
maybe_uninit_slice
3.96.
mem_take
3.97.
new_uninit
3.98.
no_more_cas
3.99.
once_is_completed
3.100.
once_poison
3.101.
option_expect_none
3.102.
option_flattening
3.103.
option_result_contains
3.104.
option_unwrap_none
3.105.
panic_abort
3.106.
panic_info_message
3.107.
panic_internals
3.108.
panic_unwind
3.109.
path_buf_capacity
3.110.
pattern
3.111.
poll_map
3.112.
print_internals
3.113.
proc_macro_def_site
3.114.
proc_macro_diagnostic
3.115.
proc_macro_internals
3.116.
proc_macro_quote
3.117.
proc_macro_raw_ident
3.118.
proc_macro_span
3.119.
process_exitcode_placeholder
3.120.
process_internals
3.121.
profiler_runtime_lib
3.122.
ptr_internals
3.123.
ptr_offset_from
3.124.
ptr_wrapping_offset_from
3.125.
range_is_empty
3.126.
raw
3.127.
raw_vec_internals
3.128.
rc_into_raw_non_null
3.129.
read_initializer
3.130.
receiver_trait
3.131.
renamed_spin_loop
3.132.
repeat_generic_slice
3.133.
result_cloned
3.134.
result_contains_err
3.135.
result_copied
3.136.
result_map_or_else
3.137.
rt
3.138.
sanitizer_runtime_lib
3.139.
saturating_neg
3.140.
seek_convenience
3.141.
set_stdio
3.142.
sgx_platform
3.143.
shrink_to
3.144.
slice_concat_ext
3.145.
slice_concat_trait
3.146.
slice_from_raw_parts
3.147.
slice_index_methods
3.148.
slice_internals
3.149.
slice_iter_mut_as_slice
3.150.
slice_partition_at_index
3.151.
slice_partition_dedup
3.152.
sort_internals
3.153.
std_internals
3.154.
stdsimd
3.155.
step_trait
3.156.
str_internals
3.157.
termination_trait_lib
3.158.
test
3.159.
thread_local_internals
3.160.
thread_spawn_unchecked
3.161.
tidy_test_never_used_anywhere_else
3.162.
todo_macro
3.163.
toowned_clone_into
3.164.
trace_macros
3.165.
trusted_len
3.166.
try_reserve
3.167.
try_trait
3.168.
udp_peer_addr
3.169.
unicode_internals
3.170.
unicode_version
3.171.
unsize
3.172.
update_panic_count
3.173.
vec_drain_as_slice
3.174.
vec_leak
3.175.
vec_remove_item
3.176.
vec_resize_default
3.177.
wait_timeout_until
3.178.
wait_until
3.179.
wasi_ext
3.180.
weak_counts
3.181.
weak_into_raw
3.182.
windows_by_handle
3.183.
windows_c
3.184.
windows_file_type_ext
3.185.
windows_handle
3.186.
windows_net
3.187.
windows_stdio
3.188.
wrapping_int_impl
3.189.
wrapping_next_power_of_two
Light (default)
Rust
Coal
Navy
Ayu
The Rust Unstable Book
option_unwrap_none
The tracking issue for this feature is:
#62633