The Unstable Book
1.
Compiler flags
1.1.
linker_flavor
1.2.
profile
2.
Language features
2.1.
aarch64_target_feature
2.2.
abi_msp430_interrupt
2.3.
abi_ptx
2.4.
abi_thiscall
2.5.
abi_unadjusted
2.6.
abi_vectorcall
2.7.
abi_x86_interrupt
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.
arm_target_feature
2.14.
asm
2.15.
associated_type_defaults
2.16.
attr_literals
2.17.
avx512_target_feature
2.18.
box_patterns
2.19.
box_syntax
2.20.
catch_expr
2.21.
cfg_target_has_atomic
2.22.
cfg_target_thread_local
2.23.
cfg_target_vendor
2.24.
compiler_builtins
2.25.
concat_idents
2.26.
const_fn
2.27.
const_let
2.28.
crate_in_paths
2.29.
crate_visibility_modifier
2.30.
custom_attribute
2.31.
custom_derive
2.32.
decl_macro
2.33.
default_type_parameter_fallback
2.34.
doc_alias
2.35.
doc_cfg
2.36.
doc_masked
2.37.
doc_spotlight
2.38.
dropck_eyepatch
2.39.
dropck_parametricity
2.40.
exclusive_range_pattern
2.41.
exhaustive_patterns
2.42.
extern_absolute_paths
2.43.
extern_in_paths
2.44.
extern_prelude
2.45.
extern_types
2.46.
external_doc
2.47.
fundamental
2.48.
generators
2.49.
generic_associated_types
2.50.
global_allocator
2.51.
global_asm
2.52.
hexagon_target_feature
2.53.
if_while_or_patterns
2.54.
in_band_lifetimes
2.55.
infer_outlives_requirements
2.56.
intrinsics
2.57.
label_break_value
2.58.
lang_items
2.59.
link_args
2.60.
link_cfg
2.61.
link_llvm_intrinsics
2.62.
linkage
2.63.
log_syntax
2.64.
macro_at_most_once_rep
2.65.
macro_literal_matcher
2.66.
macro_vis_matcher
2.67.
macros_in_extern
2.68.
main
2.69.
mips_target_feature
2.70.
mmx_target_feature
2.71.
naked_functions
2.72.
needs_allocator
2.73.
needs_panic_runtime
2.74.
never_type
2.75.
nll
2.76.
no_core
2.77.
no_debug
2.78.
non_ascii_idents
2.79.
non_exhaustive
2.80.
non_modrs_mods
2.81.
omit_gdb_pretty_printer_section
2.82.
on_unimplemented
2.83.
optin_builtin_traits
2.84.
overlapping_marker_traits
2.85.
panic_runtime
2.86.
pattern_parentheses
2.87.
platform_intrinsics
2.88.
plugin
2.89.
plugin_registrar
2.90.
powerpc_target_feature
2.91.
prelude_import
2.92.
proc_macro
2.93.
proc_macro_expr
2.94.
proc_macro_gen
2.95.
proc_macro_mod
2.96.
proc_macro_non_items
2.97.
proc_macro_path_invoc
2.98.
profiler_runtime
2.99.
quote
2.100.
raw_identifiers
2.101.
repr_packed
2.102.
repr_simd
2.103.
repr_transparent
2.104.
repr128
2.105.
rustc_attrs
2.106.
rustc_const_unstable
2.107.
rustc_diagnostic_macros
2.108.
sanitizer_runtime
2.109.
simd_ffi
2.110.
slice_patterns
2.111.
specialization
2.112.
sse4a_target_feature
2.113.
staged_api
2.114.
start
2.115.
static_nobundle
2.116.
stmt_expr_attributes
2.117.
structural_match
2.118.
tbm_target_feature
2.119.
termination_trait_test
2.120.
thread_local
2.121.
tool_attributes
2.122.
trace_macros
2.123.
trait_alias
2.124.
trivial_bounds
2.125.
type_ascription
2.126.
unboxed_closures
2.127.
underscore_imports
2.128.
unsized_tuple_coercion
2.129.
untagged_unions
2.130.
unwind_attributes
2.131.
use_extern_macros
2.132.
used
2.133.
wasm_custom_section
2.134.
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.
atomic_min_max
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.
cell_update
3.16.
char_error_internals
3.17.
coerce_unsized
3.18.
collections_range
3.19.
compiler_builtins_lib
3.20.
concat_idents_macro
3.21.
const_manually_drop_new
3.22.
const_slice_as_ptr
3.23.
const_slice_len
3.24.
const_str_as_bytes
3.25.
const_str_as_ptr
3.26.
const_str_len
3.27.
const_string_new
3.28.
const_type_id
3.29.
const_vec_new
3.30.
core_float
3.31.
core_intrinsics
3.32.
core_panic
3.33.
core_panic_info
3.34.
core_private_bignum
3.35.
core_private_diy_float
3.36.
deadline_api
3.37.
dec2flt
3.38.
decode_utf8
3.39.
derive_clone_copy
3.40.
derive_eq
3.41.
drain_filter
3.42.
duration_getters
3.43.
entry_or_default
3.44.
error_type_id
3.45.
euclidean_division
3.46.
exact_chunks
3.47.
exact_size_is_empty
3.48.
extra_log_consts
3.49.
fd
3.50.
fd_read
3.51.
fixed_size_array
3.52.
float_internals
3.53.
flt2dec
3.54.
fmt_flags_align
3.55.
fmt_internals
3.56.
fn_traits
3.57.
fnbox
3.58.
future_atomic_orderings
3.59.
generator_trait
3.60.
get_type_id
3.61.
hashmap_internals
3.62.
int_error_internals
3.63.
int_to_from_bytes
3.64.
integer_atomics
3.65.
io
3.66.
io_error_internals
3.67.
ip
3.68.
ip_constructors
3.69.
iterator_find_map
3.70.
iterator_flatten
3.71.
iterator_repeat_with
3.72.
iterator_step_by
3.73.
libstd_io_internals
3.74.
libstd_sys_internals
3.75.
libstd_thread_internals
3.76.
linked_list_extras
3.77.
map_entry_replace
3.78.
map_get_key_value
3.79.
mpsc_select
3.80.
n16
3.81.
no_more_cas
3.82.
no_panic_pow
3.83.
offset_to
3.84.
once_poison
3.85.
option_xor
3.86.
panic_abort
3.87.
panic_info_message
3.88.
panic_internals
3.89.
panic_unwind
3.90.
path_ancestors
3.91.
pattern
3.92.
pin
3.93.
print_internals
3.94.
proc_macro_internals
3.95.
process_exitcode_placeholder
3.96.
process_internals
3.97.
profiler_runtime_lib
3.98.
ptr_internals
3.99.
ptr_offset_from
3.100.
ptr_wrapping_offset_from
3.101.
range_contains
3.102.
range_is_empty
3.103.
raw
3.104.
rc_downcast
3.105.
read_initializer
3.106.
refcell_replace_swap
3.107.
repeat_generic_slice
3.108.
reverse_bits
3.109.
rt
3.110.
rustc_private
3.111.
rustc_stack_internals
3.112.
sanitizer_runtime_lib
3.113.
set_stdio
3.114.
shrink_to
3.115.
slice_align_to
3.116.
slice_concat_ext
3.117.
slice_get_slice
3.118.
slice_internals
3.119.
slice_sort_by_cached_key
3.120.
sort_internals
3.121.
std_internals
3.122.
stdsimd
3.123.
step_trait
3.124.
str_escape
3.125.
str_internals
3.126.
termination_trait_lib
3.127.
test
3.128.
thread_local_internals
3.129.
toowned_clone_into
3.130.
transpose_result
3.131.
trusted_len
3.132.
try_from
3.133.
try_reserve
3.134.
try_trait
3.135.
unicode
3.136.
unicode_internals
3.137.
unicode_version
3.138.
unsize
3.139.
update_panic_count
3.140.
vec_remove_item
3.141.
vec_resize_default
3.142.
vec_resize_with
3.143.
wait_timeout_until
3.144.
wait_until
3.145.
windows_c
3.146.
windows_file_type_ext
3.147.
windows_handle
3.148.
windows_net
3.149.
windows_stdio
3.150.
wrapping_int_impl
Light
(default)
Rust
Coal
Navy
Ayu
const_let
The tracking issue for this feature is:
#48821