The Unstable Book
1.
Compiler flags
1.1.
linker_flavor
1.2.
profile
1.3.
remap_path_prefix
2.
Language features
2.1.
abi_msp430_interrupt
2.2.
abi_ptx
2.3.
abi_thiscall
2.4.
abi_unadjusted
2.5.
abi_vectorcall
2.6.
abi_x86_interrupt
2.7.
advanced_slice_patterns
2.8.
allocator_internals
2.9.
allow_fail
2.10.
allow_internal_unsafe
2.11.
allow_internal_unstable
2.12.
arbitrary_self_types
2.13.
asm
2.14.
associated_type_defaults
2.15.
attr_literals
2.16.
box_patterns
2.17.
box_syntax
2.18.
catch_expr
2.19.
cfg_target_feature
2.20.
cfg_target_has_atomic
2.21.
cfg_target_thread_local
2.22.
cfg_target_vendor
2.23.
clone_closures
2.24.
compiler_builtins
2.25.
concat_idents
2.26.
conservative_impl_trait
2.27.
const_fn
2.28.
const_indexing
2.29.
copy_closures
2.30.
crate_in_paths
2.31.
crate_visibility_modifier
2.32.
custom_attribute
2.33.
custom_derive
2.34.
decl_macro
2.35.
default_type_parameter_fallback
2.36.
doc_cfg
2.37.
doc_masked
2.38.
doc_spotlight
2.39.
dotdoteq_in_patterns
2.40.
dropck_eyepatch
2.41.
dropck_parametricity
2.42.
dyn_trait
2.43.
exclusive_range_pattern
2.44.
extern_absolute_paths
2.45.
extern_in_paths
2.46.
extern_types
2.47.
external_doc
2.48.
fn_must_use
2.49.
fundamental
2.50.
generators
2.51.
generic_associated_types
2.52.
generic_param_attrs
2.53.
global_allocator
2.54.
global_asm
2.55.
i128_type
2.56.
in_band_lifetimes
2.57.
inclusive_range_syntax
2.58.
intrinsics
2.59.
lang_items
2.60.
link_args
2.61.
link_cfg
2.62.
link_llvm_intrinsics
2.63.
linkage
2.64.
log_syntax
2.65.
macro_at_most_once_rep
2.66.
macro_lifetime_matcher
2.67.
macro_reexport
2.68.
macro_vis_matcher
2.69.
main
2.70.
match_default_bindings
2.71.
naked_functions
2.72.
needs_allocator
2.73.
needs_panic_runtime
2.74.
nested_impl_trait
2.75.
never_type
2.76.
nll
2.77.
no_core
2.78.
no_debug
2.79.
non_ascii_idents
2.80.
non_exhaustive
2.81.
non_modrs_mods
2.82.
omit_gdb_pretty_printer_section
2.83.
on_unimplemented
2.84.
optin_builtin_traits
2.85.
overlapping_marker_traits
2.86.
panic_runtime
2.87.
placement_in_syntax
2.88.
platform_intrinsics
2.89.
plugin
2.90.
plugin_registrar
2.91.
prelude_import
2.92.
proc_macro
2.93.
profiler_runtime
2.94.
quote
2.95.
repr_simd
2.96.
repr_transparent
2.97.
repr128
2.98.
rustc_attrs
2.99.
rustc_const_unstable
2.100.
rustc_diagnostic_macros
2.101.
sanitizer_runtime
2.102.
simd_ffi
2.103.
slice_patterns
2.104.
specialization
2.105.
staged_api
2.106.
start
2.107.
static_nobundle
2.108.
stmt_expr_attributes
2.109.
structural_match
2.110.
target_feature
2.111.
termination_trait
2.112.
thread_local
2.113.
trace_macros
2.114.
trait_alias
2.115.
type_ascription
2.116.
unboxed_closures
2.117.
underscore_lifetimes
2.118.
universal_impl_trait
2.119.
unsized_tuple_coercion
2.120.
untagged_unions
2.121.
unwind_attributes
2.122.
use_extern_macros
2.123.
used
2.124.
wasm_import_memory
3.
Library Features
3.1.
align_offset
3.2.
alloc
3.3.
alloc_jemalloc
3.4.
alloc_system
3.5.
allocator_api
3.6.
array_error_internals
3.7.
ascii_ctype
3.8.
box_heap
3.9.
box_into_raw_non_null
3.10.
box_leak
3.11.
bufreader_is_empty
3.12.
bufreader_seek_relative
3.13.
c_void_variant
3.14.
char_error_internals
3.15.
coerce_unsized
3.16.
collection_placement
3.17.
collections_range
3.18.
compiler_builtins_lib
3.19.
concat_idents_macro
3.20.
const_type_id
3.21.
core_char_ext
3.22.
core_float
3.23.
core_intrinsics
3.24.
core_panic
3.25.
core_private_bignum
3.26.
core_private_diy_float
3.27.
core_slice_ext
3.28.
core_str_ext
3.29.
cursor_mut_vec
3.30.
deadline_api
3.31.
dec2flt
3.32.
decode_utf8
3.33.
derive_clone_copy
3.34.
derive_eq
3.35.
drain_filter
3.36.
duration_extras
3.37.
duration_from_micros
3.38.
entry_and_modify
3.39.
entry_or_default
3.40.
error_type_id
3.41.
exact_chunks
3.42.
exact_size_is_empty
3.43.
fd
3.44.
fd_read
3.45.
fixed_size_array
3.46.
flt2dec
3.47.
fmt_flags_align
3.48.
fmt_internals
3.49.
fn_traits
3.50.
fnbox
3.51.
from_ref
3.52.
from_utf8_error_as_bytes
3.53.
fs_read_write
3.54.
fused
3.55.
future_atomic_orderings
3.56.
generator_trait
3.57.
get_type_id
3.58.
getpid
3.59.
hash_map_remove_entry
3.60.
heap_api
3.61.
i128
3.62.
inclusive_range
3.63.
int_error_internals
3.64.
integer_atomics
3.65.
io
3.66.
io_error_internals
3.67.
ip
3.68.
ip_constructors
3.69.
iter_rfind
3.70.
iter_rfold
3.71.
iterator_step_by
3.72.
iterator_try_fold
3.73.
libstd_io_internals
3.74.
libstd_sys_internals
3.75.
libstd_thread_internals
3.76.
linked_list_extras
3.77.
lookup_host
3.78.
map_entry_replace
3.79.
mpsc_select
3.80.
n16
3.81.
nonnull_cast
3.82.
nonzero
3.83.
offset_to
3.84.
once_poison
3.85.
option_filter
3.86.
option_ref_mut_cloned
3.87.
panic_abort
3.88.
panic_unwind
3.89.
pattern
3.90.
placement_in
3.91.
placement_new_protocol
3.92.
pointer_methods
3.93.
print_internals
3.94.
proc_macro_internals
3.95.
process_internals
3.96.
profiler_runtime_lib
3.97.
ptr_internals
3.98.
range_contains
3.99.
raw
3.100.
rc_downcast
3.101.
read_initializer
3.102.
refcell_replace_swap
3.103.
rt
3.104.
rustc_private
3.105.
sanitizer_runtime_lib
3.106.
set_stdio
3.107.
shared
3.108.
sip_hash_13
3.109.
slice_concat_ext
3.110.
slice_get_slice
3.111.
slice_internals
3.112.
slice_rotate
3.113.
slice_rsplit
3.114.
sort_internals
3.115.
splice
3.116.
std_internals
3.117.
step_trait
3.118.
str_escape
3.119.
str_internals
3.120.
string_retain
3.121.
swap_nonoverlapping
3.122.
swap_with_slice
3.123.
take_set_limit
3.124.
test
3.125.
thread_local_internals
3.126.
thread_local_state
3.127.
toowned_clone_into
3.128.
transpose_result
3.129.
trusted_len
3.130.
try_from
3.131.
try_trait
3.132.
unicode
3.133.
unix_ppid
3.134.
unreachable
3.135.
unsize
3.136.
update_panic_count
3.137.
vec_remove_item
3.138.
vec_resize_default
3.139.
windows_c
3.140.
windows_handle
3.141.
windows_net
3.142.
windows_stdio
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iter_rfold
The tracking issue for this feature is:
#44705