The Unstable Book
1.
Compiler flags
1.1.
profile
1.2.
linker_flavor
1.3.
remap_path_prefix
2.
Language features
2.1.
allow_internal_unstable
2.2.
panic_runtime
2.3.
simd_ffi
2.4.
concat_idents
2.5.
use_extern_macros
2.6.
compiler_builtins
2.7.
lang_items
2.8.
box_syntax
2.9.
associated_consts
2.10.
simd
2.11.
dropck_parametricity
2.12.
repr_simd
2.13.
macro_vis_matcher
2.14.
link_cfg
2.15.
structural_match
2.16.
optin_builtin_traits
2.17.
repr_align
2.18.
abi_vectorcall
2.19.
unboxed_closures
2.20.
cfg_target_thread_local
2.21.
rustc_diagnostic_macros
2.22.
never_type
2.23.
type_ascription
2.24.
abi_msp430_interrupt
2.25.
log_syntax
2.26.
allocator
2.27.
plugin_registrar
2.28.
no_core
2.29.
plugin
2.30.
macro_reexport
2.31.
overlapping_marker_traits
2.32.
needs_allocator
2.33.
abi_thiscall
2.34.
placement_in_syntax
2.35.
main
2.36.
dropck_eyepatch
2.37.
quote
2.38.
cfg_target_feature
2.39.
abi_ptx
2.40.
drop_types_in_const
2.41.
cfg_target_has_atomic
2.42.
abi_sysv64
2.43.
conservative_impl_trait
2.44.
fundamental
2.45.
unwind_attributes
2.46.
naked_functions
2.47.
start
2.48.
advanced_slice_patterns
2.49.
abi_x86_interrupt
2.50.
inclusive_range_syntax
2.51.
staged_api
2.52.
decl_macro
2.53.
trace_macros
2.54.
stmt_expr_attributes
2.55.
profiler_runtime
2.56.
cfg_target_vendor
2.57.
platform_intrinsics
2.58.
on_unimplemented
2.59.
exclusive_range_pattern
2.60.
link_llvm_intrinsics
2.61.
const_fn
2.62.
i128_type
2.63.
rvalue_static_promotion
2.64.
link_args
2.65.
omit_gdb_pretty_printer_section
2.66.
target_feature
2.67.
box_patterns
2.68.
default_type_parameter_fallback
2.69.
specialization
2.70.
non_ascii_idents
2.71.
thread_local
2.72.
catch_expr
2.73.
prelude_import
2.74.
abi_unadjusted
2.75.
proc_macro
2.76.
slice_patterns
2.77.
global_asm
2.78.
const_indexing
2.79.
used
2.80.
intrinsics
2.81.
needs_panic_runtime
2.82.
associated_type_defaults
2.83.
untagged_unions
2.84.
linkage
2.85.
asm
2.86.
sanitizer_runtime
2.87.
rustc_attrs
2.88.
attr_literals
2.89.
custom_derive
2.90.
static_nobundle
2.91.
custom_attribute
2.92.
no_debug
2.93.
generic_param_attrs
3.
Library Features
3.1.
collections_range
3.2.
proc_macro_internals
3.3.
as_c_str
3.4.
into_boxed_c_str
3.5.
sort_internals
3.6.
windows_stdio
3.7.
core_float
3.8.
derive_clone_copy
3.9.
oom
3.10.
unicode
3.11.
print_internals
3.12.
lookup_host
3.13.
toowned_clone_into
3.14.
core_str_ext
3.15.
unsize
3.16.
str_mut_extras
3.17.
from_utf8_error_as_bytes
3.18.
compiler_fences
3.19.
question_mark_carrier
3.20.
char_escape_debug
3.21.
slice_rsplit
3.22.
nonzero
3.23.
rand
3.24.
n16
3.25.
iter_rfind
3.26.
linked_list_extras
3.27.
alloc_system
3.28.
future_atomic_orderings
3.29.
io
3.30.
str_box_extras
3.31.
placement_in
3.32.
step_trait
3.33.
once_poison
3.34.
derive_eq
3.35.
libstd_thread_internals
3.36.
int_error_internals
3.37.
trusted_len
3.38.
c_void_variant
3.39.
sanitizer_runtime_lib
3.40.
option_entry
3.41.
slice_rotate
3.42.
iterator_step_by
3.43.
str_escape
3.44.
alloc
3.45.
reverse_cmp_key
3.46.
update_panic_count
3.47.
error_type_id
3.48.
splice
3.49.
collection_placement
3.50.
slice_concat_ext
3.51.
pattern
3.52.
windows_c
3.53.
i128
3.54.
coerce_unsized
3.55.
into_boxed_os_str
3.56.
inclusive_range
3.57.
rt
3.58.
alloc_jemalloc
3.59.
libstd_sys_internals
3.60.
windows_net
3.61.
core_private_diy_float
3.62.
test
3.63.
concat_idents_macro
3.64.
never_type_impls
3.65.
core_char_ext
3.66.
panic_abort
3.67.
rustc_private
3.68.
fn_traits
3.69.
needs_drop
3.70.
range_contains
3.71.
core_intrinsics
3.72.
try_trait
3.73.
into_boxed_path
3.74.
fnbox
3.75.
vec_remove_item
3.76.
thread_local_state
3.77.
mpsc_select
3.78.
flt2dec
3.79.
str_checked_slicing
3.80.
decode_utf8
3.81.
fd_read
3.82.
integer_atomics
3.83.
compiler_builtins_lib
3.84.
shared
3.85.
raw
3.86.
core_slice_ext
3.87.
step_by
3.88.
box_heap
3.89.
discriminant_value
3.90.
manually_drop
3.91.
osstring_shrink_to_fit
3.92.
windows_handle
3.93.
more_io_inner_methods
3.94.
vec_resize_default
3.95.
float_bits_conv
3.96.
sort_unstable
3.97.
utf8_error_error_len
3.98.
fd
3.99.
profiler_runtime_lib
3.100.
core_panic
3.101.
offset_to
3.102.
hint_core_should_pause
3.103.
sip_hash_13
3.104.
str_internals
3.105.
exact_size_is_empty
3.106.
unique
3.107.
get_type_id
3.108.
panic_unwind
3.109.
command_envs
3.110.
ord_max_min
3.111.
thread_id
3.112.
slice_get_slice
3.113.
libstd_io_internals
3.114.
fused
3.115.
heap_api
3.116.
fmt_flags_align
3.117.
placement_new_protocol
3.118.
try_from
3.119.
io_error_internals
3.120.
dec2flt
3.121.
fmt_internals
3.122.
thread_local_internals
3.123.
ip
3.124.
ascii_ctype
3.125.
core_private_bignum
3.126.
set_stdio
3.127.
collections
3.128.
fixed_size_array
Language features