The Unstable Book
1.
Compiler flags
1.1.
linker_flavor
1.2.
profile
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.
allocator_internals
2.8.
allow_fail
2.9.
allow_internal_unsafe
2.10.
allow_internal_unstable
2.11.
arbitrary_self_types
2.12.
asm
2.13.
associated_type_defaults
2.14.
attr_literals
2.15.
box_patterns
2.16.
box_syntax
2.17.
catch_expr
2.18.
cfg_target_feature
2.19.
cfg_target_has_atomic
2.20.
cfg_target_thread_local
2.21.
cfg_target_vendor
2.22.
compiler_builtins
2.23.
concat_idents
2.24.
const_fn
2.25.
crate_in_paths
2.26.
crate_visibility_modifier
2.27.
custom_attribute
2.28.
custom_derive
2.29.
decl_macro
2.30.
default_type_parameter_fallback
2.31.
doc_cfg
2.32.
doc_masked
2.33.
doc_spotlight
2.34.
dropck_eyepatch
2.35.
dropck_parametricity
2.36.
dyn_trait
2.37.
exclusive_range_pattern
2.38.
exhaustive_patterns
2.39.
extern_absolute_paths
2.40.
extern_in_paths
2.41.
extern_types
2.42.
external_doc
2.43.
fn_must_use
2.44.
fundamental
2.45.
generators
2.46.
generic_associated_types
2.47.
generic_param_attrs
2.48.
global_allocator
2.49.
global_asm
2.50.
if_while_or_patterns
2.51.
in_band_lifetimes
2.52.
intrinsics
2.53.
lang_items
2.54.
link_args
2.55.
link_cfg
2.56.
link_llvm_intrinsics
2.57.
linkage
2.58.
log_syntax
2.59.
macro_at_most_once_rep
2.60.
macro_lifetime_matcher
2.61.
macro_reexport
2.62.
macro_vis_matcher
2.63.
main
2.64.
naked_functions
2.65.
needs_allocator
2.66.
needs_panic_runtime
2.67.
never_type
2.68.
nll
2.69.
no_core
2.70.
no_debug
2.71.
non_ascii_idents
2.72.
non_exhaustive
2.73.
non_modrs_mods
2.74.
omit_gdb_pretty_printer_section
2.75.
on_unimplemented
2.76.
optin_builtin_traits
2.77.
overlapping_marker_traits
2.78.
panic_runtime
2.79.
pattern_parentheses
2.80.
placement_in_syntax
2.81.
platform_intrinsics
2.82.
plugin
2.83.
plugin_registrar
2.84.
prelude_import
2.85.
proc_macro
2.86.
profiler_runtime
2.87.
quote
2.88.
raw_identifiers
2.89.
repr_simd
2.90.
repr_transparent
2.91.
repr128
2.92.
rustc_attrs
2.93.
rustc_const_unstable
2.94.
rustc_diagnostic_macros
2.95.
sanitizer_runtime
2.96.
simd_ffi
2.97.
slice_patterns
2.98.
specialization
2.99.
staged_api
2.100.
start
2.101.
static_nobundle
2.102.
stmt_expr_attributes
2.103.
structural_match
2.104.
target_feature
2.105.
termination_trait_test
2.106.
thread_local
2.107.
trace_macros
2.108.
trait_alias
2.109.
type_ascription
2.110.
unboxed_closures
2.111.
underscore_imports
2.112.
unsized_tuple_coercion
2.113.
untagged_unions
2.114.
unwind_attributes
2.115.
use_extern_macros
2.116.
used
2.117.
wasm_custom_section
2.118.
wasm_import_module
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.
assoc_unix_epoch
3.9.
box_heap
3.10.
box_into_raw_non_null
3.11.
bufreader_buffer
3.12.
bufreader_is_empty
3.13.
bufreader_seek_relative
3.14.
c_void_variant
3.15.
char_error_internals
3.16.
coerce_unsized
3.17.
collection_placement
3.18.
collections_range
3.19.
compiler_builtins_lib
3.20.
concat_idents_macro
3.21.
const_type_id
3.22.
core_char_ext
3.23.
core_float
3.24.
core_intrinsics
3.25.
core_panic
3.26.
core_panic_info
3.27.
core_private_bignum
3.28.
core_private_diy_float
3.29.
core_slice_ext
3.30.
core_str_ext
3.31.
deadline_api
3.32.
dec2flt
3.33.
decode_utf8
3.34.
derive_clone_copy
3.35.
derive_eq
3.36.
drain_filter
3.37.
duration_extras
3.38.
duration_from_micros
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.
future_atomic_orderings
3.53.
generator_trait
3.54.
get_type_id
3.55.
hash_map_remove_entry
3.56.
hashmap_internals
3.57.
inclusive_range_fields
3.58.
int_error_internals
3.59.
integer_atomics
3.60.
io
3.61.
io_error_internals
3.62.
ip
3.63.
ip_constructors
3.64.
iter_rfind
3.65.
iter_rfold
3.66.
iterator_flatten
3.67.
iterator_repeat_with
3.68.
iterator_step_by
3.69.
iterator_try_fold
3.70.
libstd_io_internals
3.71.
libstd_sys_internals
3.72.
libstd_thread_internals
3.73.
linked_list_extras
3.74.
lookup_host
3.75.
map_entry_replace
3.76.
map_get_key_value
3.77.
mpsc_select
3.78.
n16
3.79.
no_panic_pow
3.80.
nonnull_cast
3.81.
nonzero
3.82.
offset_to
3.83.
once_poison
3.84.
option_filter
3.85.
panic_abort
3.86.
panic_info_message
3.87.
panic_internals
3.88.
panic_unwind
3.89.
path_ancestors
3.90.
pattern
3.91.
pin
3.92.
placement_in
3.93.
placement_new_protocol
3.94.
print_internals
3.95.
proc_macro_internals
3.96.
process_exitcode_placeholder
3.97.
process_internals
3.98.
profiler_runtime_lib
3.99.
ptr_internals
3.100.
ptr_offset_from
3.101.
ptr_wrapping_offset_from
3.102.
range_contains
3.103.
range_is_empty
3.104.
raw
3.105.
rc_downcast
3.106.
read_initializer
3.107.
refcell_replace_swap
3.108.
reverse_bits
3.109.
rt
3.110.
rustc_private
3.111.
sanitizer_runtime_lib
3.112.
set_stdio
3.113.
shrink_to
3.114.
slice_concat_ext
3.115.
slice_get_slice
3.116.
slice_internals
3.117.
slice_rsplit
3.118.
slice_sort_by_cached_key
3.119.
sort_internals
3.120.
splice
3.121.
std_internals
3.122.
stdsimd
3.123.
step_trait
3.124.
str_escape
3.125.
str_internals
3.126.
swap_nonoverlapping
3.127.
swap_with_slice
3.128.
take_set_limit
3.129.
termination_trait_lib
3.130.
test
3.131.
thread_local_internals
3.132.
toowned_clone_into
3.133.
transpose_result
3.134.
trusted_len
3.135.
try_from
3.136.
try_reserve
3.137.
try_trait
3.138.
unicode
3.139.
unix_ppid
3.140.
unreachable
3.141.
unsize
3.142.
update_panic_count
3.143.
vec_remove_item
3.144.
vec_resize_default
3.145.
wait_timeout_until
3.146.
wait_until
3.147.
windows_c
3.148.
windows_file_type_ext
3.149.
windows_handle
3.150.
windows_net
3.151.
windows_stdio
3.152.
wrapping_int_impl
Light
(default)
Rust
Coal
Navy
Ayu
map_get_key_value
The tracking issue for this feature is:
#49347