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_self_types
2.16.
arm_target_feature
2.17.
asm
2.18.
associated_type_defaults
2.19.
async_await
2.20.
avx512_target_feature
2.21.
await_macro
2.22.
bind_by_move_pattern_guards
2.23.
box_patterns
2.24.
box_syntax
2.25.
c_variadic
2.26.
cfg_target_has_atomic
2.27.
cfg_target_thread_local
2.28.
cmpxchg16b_target_feature
2.29.
compiler_builtins
2.30.
concat_idents
2.31.
const_compare_raw_pointers
2.32.
const_fn
2.33.
const_fn_union
2.34.
const_generics
2.35.
const_panic
2.36.
const_raw_ptr_deref
2.37.
const_raw_ptr_to_usize_cast
2.38.
const_transmute
2.39.
crate_visibility_modifier
2.40.
custom_attribute
2.41.
custom_inner_attributes
2.42.
custom_test_frameworks
2.43.
decl_macro
2.44.
default_type_parameter_fallback
2.45.
doc_alias
2.46.
doc_cfg
2.47.
doc_keyword
2.48.
doc_masked
2.49.
doc_spotlight
2.50.
dropck_eyepatch
2.51.
dropck_parametricity
2.52.
exclusive_range_pattern
2.53.
exhaustive_patterns
2.54.
existential_type
2.55.
extern_types
2.56.
external_doc
2.57.
f16c_target_feature
2.58.
ffi_returns_twice
2.59.
format_args_nl
2.60.
fundamental
2.61.
generators
2.62.
generic_associated_types
2.63.
global_asm
2.64.
hexagon_target_feature
2.65.
impl_trait_in_bindings
2.66.
in_band_lifetimes
2.67.
infer_static_outlives_requirements
2.68.
intrinsics
2.69.
label_break_value
2.70.
lang_items
2.71.
link_args
2.72.
link_cfg
2.73.
link_llvm_intrinsics
2.74.
linkage
2.75.
lint_reasons
2.76.
log_syntax
2.77.
macros_in_extern
2.78.
main
2.79.
marker_trait_attr
2.80.
mips_target_feature
2.81.
mmx_target_feature
2.82.
movbe_target_feature
2.83.
naked_functions
2.84.
needs_panic_runtime
2.85.
never_type
2.86.
nll
2.87.
no_core
2.88.
no_debug
2.89.
non_ascii_idents
2.90.
non_exhaustive
2.91.
omit_gdb_pretty_printer_section
2.92.
on_unimplemented
2.93.
optimize_attribute
2.94.
optin_builtin_traits
2.95.
overlapping_marker_traits
2.96.
panic_runtime
2.97.
platform_intrinsics
2.98.
plugin
2.99.
plugin_registrar
2.100.
powerpc_target_feature
2.101.
precise_pointer_size_matching
2.102.
prelude_import
2.103.
proc_macro_hygiene
2.104.
profiler_runtime
2.105.
re_rebalance_coherence
2.106.
repr_align_enum
2.107.
repr_simd
2.108.
repr128
2.109.
rtm_target_feature
2.110.
rustc_attrs
2.111.
rustc_const_unstable
2.112.
rustc_diagnostic_macros
2.113.
sanitizer_runtime
2.114.
simd_ffi
2.115.
slice_patterns
2.116.
specialization
2.117.
sse4a_target_feature
2.118.
staged_api
2.119.
start
2.120.
static_nobundle
2.121.
stmt_expr_attributes
2.122.
structural_match
2.123.
tbm_target_feature
2.124.
test_2018_feature
2.125.
thread_local
2.126.
trace_macros
2.127.
trait_alias
2.128.
trivial_bounds
2.129.
try_blocks
2.130.
type_alias_enum_variants
2.131.
type_ascription
2.132.
unboxed_closures
2.133.
underscore_const_names
2.134.
unsized_locals
2.135.
unsized_tuple_coercion
2.136.
untagged_unions
2.137.
unwind_attributes
2.138.
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.
as_cell
3.8.
atomic_min_max
3.9.
box_into_pin
3.10.
box_into_raw_non_null
3.11.
bufreader_seek_relative
3.12.
c_void_variant
3.13.
cell_update
3.14.
char_error_internals
3.15.
checked_duration_since
3.16.
clamp
3.17.
coerce_unsized
3.18.
compiler_builtins_lib
3.19.
concat_idents_macro
3.20.
const_cstr_unchecked
3.21.
const_int_conversion
3.22.
const_saturating_int_methods
3.23.
const_slice_len
3.24.
const_str_as_bytes
3.25.
const_str_len
3.26.
const_string_new
3.27.
const_type_id
3.28.
const_vec_new
3.29.
copy_within
3.30.
core_intrinsics
3.31.
core_panic
3.32.
core_panic_info
3.33.
core_private_bignum
3.34.
core_private_diy_float
3.35.
deadline_api
3.36.
dec2flt
3.37.
derive_clone_copy
3.38.
derive_eq
3.39.
dispatch_from_dyn
3.40.
drain_filter
3.41.
duration_constants
3.42.
duration_float
3.43.
error_iter
3.44.
error_type_id
3.45.
euclidean_division
3.46.
exact_size_is_empty
3.47.
extra_log_consts
3.48.
fd
3.49.
fd_read
3.50.
fixed_size_array
3.51.
flt2dec
3.52.
fmt_internals
3.53.
fn_traits
3.54.
fnbox
3.55.
foo
3.56.
forget_unsized
3.57.
gen_future
3.58.
generator_trait
3.59.
hash_raw_entry
3.60.
hash_set_entry
3.61.
hashmap_internals
3.62.
inner_deref
3.63.
int_error_internals
3.64.
int_error_matching
3.65.
integer_atomics
3.66.
ip
3.67.
is_sorted
3.68.
iter_once_with
3.69.
libstd_io_internals
3.70.
libstd_sys_internals
3.71.
libstd_thread_internals
3.72.
linked_list_extras
3.73.
manually_drop_take
3.74.
map_entry_replace
3.75.
map_get_key_value
3.76.
maybe_uninit_array
3.77.
maybe_uninit_extra
3.78.
maybe_uninit_ref
3.79.
maybe_uninit_slice
3.80.
n16
3.81.
no_more_cas
3.82.
once_is_completed
3.83.
once_poison
3.84.
option_flattening
3.85.
option_xor
3.86.
panic_abort
3.87.
panic_info_message
3.88.
panic_internals
3.89.
panic_unwind
3.90.
path_buf_capacity
3.91.
pattern
3.92.
pin_into_inner
3.93.
print_internals
3.94.
proc_macro_def_site
3.95.
proc_macro_diagnostic
3.96.
proc_macro_internals
3.97.
proc_macro_quote
3.98.
proc_macro_raw_ident
3.99.
proc_macro_span
3.100.
process_exitcode_placeholder
3.101.
process_internals
3.102.
profiler_runtime_lib
3.103.
ptr_cast
3.104.
ptr_internals
3.105.
ptr_offset_from
3.106.
ptr_wrapping_offset_from
3.107.
range_is_empty
3.108.
raw
3.109.
raw_vec_internals
3.110.
rc_into_raw_non_null
3.111.
read_initializer
3.112.
receiver_trait
3.113.
renamed_spin_loop
3.114.
repeat_generic_slice
3.115.
result_map_or_else
3.116.
rt
3.117.
rustc_private
3.118.
sanitizer_runtime_lib
3.119.
saturating_neg
3.120.
seek_convenience
3.121.
set_stdio
3.122.
sgx_platform
3.123.
shrink_to
3.124.
slice_concat_ext
3.125.
slice_index_methods
3.126.
slice_internals
3.127.
slice_iter_mut_as_slice
3.128.
slice_partition_at_index
3.129.
slice_partition_dedup
3.130.
sort_internals
3.131.
std_internals
3.132.
stdsimd
3.133.
step_trait
3.134.
str_internals
3.135.
termination_trait_lib
3.136.
test
3.137.
thread_local_internals
3.138.
thread_spawn_unchecked
3.139.
todo_macro
3.140.
toowned_clone_into
3.141.
trusted_len
3.142.
try_reserve
3.143.
try_trait
3.144.
udp_peer_addr
3.145.
unicode_internals
3.146.
unicode_version
3.147.
unsize
3.148.
update_panic_count
3.149.
vec_drain_as_slice
3.150.
vec_remove_item
3.151.
vec_resize_default
3.152.
wait_timeout_until
3.153.
wait_until
3.154.
wasi_ext
3.155.
weak_counts
3.156.
weak_into_raw
3.157.
weak_ptr_eq
3.158.
windows_c
3.159.
windows_file_type_ext
3.160.
windows_handle
3.161.
windows_net
3.162.
windows_stdio
3.163.
wrapping_int_impl
3.164.
wrapping_next_power_of_two
Light (default)
Rust
Coal
Navy
Ayu
The Rust Unstable Book
result_map_or_else
The tracking issue for this feature is:
#53268