pub struct Features {Show 210 fields
pub declared_lang_features: Vec<(Symbol, Span, Option<Symbol>)>,
pub declared_lib_features: Vec<(Symbol, Span)>,
pub declared_features: FxHashSet<Symbol>,
pub abi_unadjusted: bool,
pub allocator_internals: bool,
pub allow_internal_unsafe: bool,
pub allow_internal_unstable: bool,
pub anonymous_lifetime_in_impl_trait: bool,
pub compiler_builtins: bool,
pub custom_mir: bool,
pub generic_assert: bool,
pub intrinsics: bool,
pub lang_items: bool,
pub lifetime_capture_rules_2024: bool,
pub link_cfg: bool,
pub more_maybe_bounds: bool,
pub multiple_supertrait_upcastable: bool,
pub negative_bounds: bool,
pub omit_gdb_pretty_printer_section: bool,
pub pattern_complexity: bool,
pub pattern_types: bool,
pub prelude_import: bool,
pub profiler_runtime: bool,
pub rustc_attrs: bool,
pub staged_api: bool,
pub test_unstable_lint: bool,
pub unqualified_local_imports: bool,
pub with_negative_coherence: bool,
pub abi_vectorcall: bool,
pub auto_traits: bool,
pub box_patterns: bool,
pub builtin_syntax: bool,
pub doc_notable_trait: bool,
pub dropck_eyepatch: bool,
pub fundamental: bool,
pub link_llvm_intrinsics: bool,
pub linkage: bool,
pub needs_panic_runtime: bool,
pub panic_runtime: bool,
pub rustc_allow_const_fn_unstable: bool,
pub rustc_private: bool,
pub rustdoc_internals: bool,
pub rustdoc_missing_doc_code_examples: bool,
pub start: bool,
pub structural_match: bool,
pub unboxed_closures: bool,
pub aarch64_unstable_target_feature: bool,
pub aarch64_ver_target_feature: bool,
pub arm_target_feature: bool,
pub avx512_target_feature: bool,
pub bpf_target_feature: bool,
pub csky_target_feature: bool,
pub ermsb_target_feature: bool,
pub hexagon_target_feature: bool,
pub lahfsahf_target_feature: bool,
pub loongarch_target_feature: bool,
pub mips_target_feature: bool,
pub powerpc_target_feature: bool,
pub prfchw_target_feature: bool,
pub riscv_target_feature: bool,
pub rtm_target_feature: bool,
pub s390x_target_feature: bool,
pub sse4a_target_feature: bool,
pub tbm_target_feature: bool,
pub wasm_target_feature: bool,
pub abi_avr_interrupt: bool,
pub abi_c_cmse_nonsecure_call: bool,
pub abi_msp430_interrupt: bool,
pub abi_ptx: bool,
pub abi_riscv_interrupt: bool,
pub abi_x86_interrupt: bool,
pub adt_const_params: bool,
pub alloc_error_handler: bool,
pub arbitrary_self_types: bool,
pub arbitrary_self_types_pointers: bool,
pub asm_experimental_arch: bool,
pub asm_goto: bool,
pub asm_unwind: bool,
pub associated_const_equality: bool,
pub associated_type_defaults: bool,
pub async_closure: bool,
pub async_fn_track_caller: bool,
pub async_for_loop: bool,
pub c_variadic: bool,
pub cfg_overflow_checks: bool,
pub cfg_relocation_model: bool,
pub cfg_sanitize: bool,
pub cfg_sanitizer_cfi: bool,
pub cfg_target_compact: bool,
pub cfg_target_has_atomic: bool,
pub cfg_target_has_atomic_equal_alignment: bool,
pub cfg_target_thread_local: bool,
pub cfg_ub_checks: bool,
pub cfg_version: bool,
pub cfi_encoding: bool,
pub closure_lifetime_binder: bool,
pub closure_track_caller: bool,
pub cmse_nonsecure_entry: bool,
pub const_async_blocks: bool,
pub const_closures: bool,
pub const_for: bool,
pub const_precise_live_drops: bool,
pub const_trait_impl: bool,
pub const_try: bool,
pub coroutine_clone: bool,
pub coroutines: bool,
pub coverage_attribute: bool,
pub custom_inner_attributes: bool,
pub custom_test_frameworks: bool,
pub decl_macro: bool,
pub deprecated_safe: bool,
pub deprecated_suggestion: bool,
pub deref_patterns: bool,
pub derive_smart_pointer: bool,
pub do_not_recommend: bool,
pub doc_auto_cfg: bool,
pub doc_cfg: bool,
pub doc_cfg_hide: bool,
pub doc_masked: bool,
pub dyn_star: bool,
pub effects: bool,
pub exhaustive_patterns: bool,
pub explicit_tail_calls: bool,
pub extended_varargs_abi_support: bool,
pub extern_types: bool,
pub f128: bool,
pub f16: bool,
pub ffi_const: bool,
pub ffi_pure: bool,
pub fmt_debug: bool,
pub fn_align: bool,
pub fn_delegation: bool,
pub freeze_impls: bool,
pub gen_blocks: bool,
pub generic_arg_infer: bool,
pub generic_associated_types_extended: bool,
pub generic_const_exprs: bool,
pub generic_const_items: bool,
pub global_registration: bool,
pub half_open_range_patterns_in_slices: bool,
pub if_let_guard: bool,
pub if_let_rescope: bool,
pub impl_trait_in_assoc_type: bool,
pub impl_trait_in_fn_trait_return: bool,
pub inherent_associated_types: bool,
pub inline_const_pat: bool,
pub intra_doc_pointers: bool,
pub large_assignments: bool,
pub lazy_type_alias: bool,
pub let_chains: bool,
pub link_arg_attribute: bool,
pub macro_metavar_expr: bool,
pub macro_metavar_expr_concat: bool,
pub marker_trait_attr: bool,
pub min_specialization: bool,
pub more_qualified_paths: bool,
pub must_not_suspend: bool,
pub mut_ref: bool,
pub naked_functions: bool,
pub native_link_modifiers_as_needed: bool,
pub negative_impls: bool,
pub never_patterns: bool,
pub never_type: bool,
pub never_type_fallback: bool,
pub no_core: bool,
pub no_sanitize: bool,
pub non_exhaustive_omitted_patterns_lint: bool,
pub non_lifetime_binders: bool,
pub object_safe_for_dispatch: bool,
pub offset_of_enum: bool,
pub offset_of_slice: bool,
pub optimize_attribute: bool,
pub patchable_function_entry: bool,
pub pin_ergonomics: bool,
pub postfix_match: bool,
pub proc_macro_hygiene: bool,
pub ref_pat_eat_one_layer_2024: bool,
pub ref_pat_eat_one_layer_2024_structural: bool,
pub register_tool: bool,
pub repr128: bool,
pub repr_simd: bool,
pub result_ffi_guarantees: bool,
pub return_type_notation: bool,
pub rust_cold_cc: bool,
pub sha512_sm_x86: bool,
pub shorter_tail_lifetimes: bool,
pub simd_ffi: bool,
pub specialization: bool,
pub stmt_expr_attributes: bool,
pub strict_provenance: bool,
pub string_deref_patterns: bool,
pub target_feature_11: bool,
pub thread_local: bool,
pub trait_alias: bool,
pub trait_upcasting: bool,
pub transmute_generic_consts: bool,
pub transparent_unions: bool,
pub trivial_bounds: bool,
pub try_blocks: bool,
pub type_alias_impl_trait: bool,
pub type_changing_struct_update: bool,
pub unnamed_fields: bool,
pub unsized_const_params: bool,
pub unsized_fn_params: bool,
pub unsized_locals: bool,
pub unsized_tuple_coercion: bool,
pub used_with_arg: bool,
pub x86_amx_intrinsics: bool,
pub xop_target_feature: bool,
pub yeet_expr: bool,
}
Expand description
A set of features to be used by later passes.
Fields§
§declared_lang_features: Vec<(Symbol, Span, Option<Symbol>)>
#![feature]
attrs for language features, for error reporting.
“declared” here means that the feature is actually enabled in the current crate.
declared_lib_features: Vec<(Symbol, Span)>
#![feature]
attrs for non-language (library) features.
“declared” here means that the feature is actually enabled in the current crate.
declared_features: FxHashSet<Symbol>
declared_lang_features
+ declared_lib_features
.
abi_unadjusted: bool
Active state of individual features (unstable only).
Allows using the unadjusted
ABI; perma-unstable.
allocator_internals: bool
Allows using #![needs_allocator]
, an implementation detail of #[global_allocator]
.
allow_internal_unsafe: bool
Allows using #[allow_internal_unsafe]
. This is an
attribute on macro_rules!
and can’t use the attribute handling
below (it has to be checked before expansion possibly makes
macros disappear).
allow_internal_unstable: bool
Allows using #[allow_internal_unstable]
. This is an
attribute on macro_rules!
and can’t use the attribute handling
below (it has to be checked before expansion possibly makes
macros disappear).
anonymous_lifetime_in_impl_trait: bool
Allows using anonymous lifetimes in argument-position impl-trait.
compiler_builtins: bool
Allows identifying the compiler_builtins
crate.
custom_mir: bool
Allows writing custom MIR
generic_assert: bool
Outputs useful assert!
messages
intrinsics: bool
Allows using the rust-intrinsic
’s “ABI”.
lang_items: bool
Allows using #[lang = ".."]
attribute for linking items to special compiler logic.
lifetime_capture_rules_2024: bool
Changes impl Trait
to capture all lifetimes in scope.
link_cfg: bool
Allows #[link(..., cfg(..))]
; perma-unstable per #37406
more_maybe_bounds: bool
Allows using ?Trait
trait bounds in more contexts.
multiple_supertrait_upcastable: bool
Allows the multiple_supertrait_upcastable
lint.
negative_bounds: bool
Allow negative trait bounds. This is an internal-only feature for testing the trait solver!
omit_gdb_pretty_printer_section: bool
Allows using #[omit_gdb_pretty_printer_section]
.
pattern_complexity: bool
Set the maximum pattern complexity allowed (not limited by default).
pattern_types: bool
Allows using pattern types.
prelude_import: bool
Allows using #[prelude_import]
on glob use
items.
profiler_runtime: bool
Used to identify crates that contain the profiler runtime.
rustc_attrs: bool
Allows using rustc_*
attributes (RFC 572).
staged_api: bool
Allows using the #[stable]
and #[unstable]
attributes.
test_unstable_lint: bool
Added for testing unstable lints; perma-unstable.
unqualified_local_imports: bool
Helps with formatting for group_imports = "StdExternalCrate"
.
with_negative_coherence: bool
Use for stable + negative coherence and strict coherence depending on trait’s rustc_strict_coherence value.
abi_vectorcall: bool
Allows using the vectorcall
ABI.
auto_traits: bool
Allows features specific to auto traits.
Renamed from optin_builtin_traits
.
box_patterns: bool
Allows using box
in patterns (RFC 469).
builtin_syntax: bool
Allows builtin # foo() syntax
doc_notable_trait: bool
Allows #[doc(notable_trait)]
.
Renamed from doc_spotlight
.
dropck_eyepatch: bool
Allows using the may_dangle
attribute (RFC 1327).
fundamental: bool
Allows using the #[fundamental]
attribute.
link_llvm_intrinsics: bool
Allows using #[link_name="llvm.*"]
.
linkage: bool
Allows using the #[linkage = ".."]
attribute.
needs_panic_runtime: bool
Allows declaring with #![needs_panic_runtime]
that a panic runtime is needed.
panic_runtime: bool
Allows using the #![panic_runtime]
attribute.
rustc_allow_const_fn_unstable: bool
Allows using #[rustc_allow_const_fn_unstable]
.
This is an attribute on const fn
for the same
purpose as #[allow_internal_unstable]
.
rustc_private: bool
Allows using compiler’s own crates.
rustdoc_internals: bool
Allows using internal rustdoc features like doc(keyword)
.
rustdoc_missing_doc_code_examples: bool
Allows using the rustdoc::missing_doc_code_examples
lint
start: bool
Allows using #[start]
on a function indicating that it is the program entrypoint.
structural_match: bool
Allows using #[structural_match]
which indicates that a type is structurally matchable.
FIXME: Subsumed by trait StructuralPartialEq
, cannot move to removed until a library
feature with the same name exists.
unboxed_closures: bool
Allows using the rust-call
ABI.
aarch64_unstable_target_feature: bool
§aarch64_ver_target_feature: bool
§arm_target_feature: bool
§avx512_target_feature: bool
§bpf_target_feature: bool
§csky_target_feature: bool
§ermsb_target_feature: bool
§hexagon_target_feature: bool
§lahfsahf_target_feature: bool
§loongarch_target_feature: bool
§mips_target_feature: bool
§powerpc_target_feature: bool
§prfchw_target_feature: bool
§riscv_target_feature: bool
§rtm_target_feature: bool
§s390x_target_feature: bool
§sse4a_target_feature: bool
§tbm_target_feature: bool
§wasm_target_feature: bool
§abi_avr_interrupt: bool
Allows extern "avr-interrupt" fn()
and extern "avr-non-blocking-interrupt" fn()
.
abi_c_cmse_nonsecure_call: bool
Allows extern "C-cmse-nonsecure-call" fn()
.
abi_msp430_interrupt: bool
Allows extern "msp430-interrupt" fn()
.
abi_ptx: bool
Allows extern "ptx-*" fn()
.
abi_riscv_interrupt: bool
Allows extern "riscv-interrupt-m" fn()
and extern "riscv-interrupt-s" fn()
.
abi_x86_interrupt: bool
Allows extern "x86-interrupt" fn()
.
adt_const_params: bool
Allows additional const parameter types, such as [u8; 10]
or user defined types
alloc_error_handler: bool
Allows defining an #[alloc_error_handler]
.
arbitrary_self_types: bool
Allows inherent and trait methods with arbitrary self types.
arbitrary_self_types_pointers: bool
Allows inherent and trait methods with arbitrary self types that are raw pointers.
asm_experimental_arch: bool
Enables experimental inline assembly support for additional architectures.
asm_goto: bool
Allows using label
operands in inline assembly.
asm_unwind: bool
Allows the may_unwind
option in inline assembly.
associated_const_equality: bool
Allows users to enforce equality of associated constants TraitImpl<AssocConst=3>
.
associated_type_defaults: bool
Allows associated type defaults.
async_closure: bool
Allows async || body
closures.
async_fn_track_caller: bool
Allows #[track_caller]
on async functions.
async_for_loop: bool
Allows for await
loops.
c_variadic: bool
Allows using C-variadics.
cfg_overflow_checks: bool
Allows the use of #[cfg(overflow_checks)
to check if integer overflow behaviour.
cfg_relocation_model: bool
Provides the relocation model information as cfg entry
cfg_sanitize: bool
Allows the use of #[cfg(sanitize = "option")]
; set when -Zsanitizer is used.
cfg_sanitizer_cfi: bool
Allows cfg(sanitizer_cfi_generalize_pointers)
and cfg(sanitizer_cfi_normalize_integers)
.
cfg_target_compact: bool
Allows cfg(target(abi = "..."))
.
cfg_target_has_atomic: bool
Allows cfg(target_has_atomic_load_store = "...")
.
cfg_target_has_atomic_equal_alignment: bool
Allows cfg(target_has_atomic_equal_alignment = "...")
.
cfg_target_thread_local: bool
Allows cfg(target_thread_local)
.
cfg_ub_checks: bool
Allows the use of #[cfg(ub_checks)
to check if UB checks are enabled.
cfg_version: bool
Allow conditional compilation depending on rust version
cfi_encoding: bool
Allows to use the #[cfi_encoding = ""]
attribute.
closure_lifetime_binder: bool
Allows for<...>
on closures and coroutines.
closure_track_caller: bool
Allows #[track_caller]
on closures and coroutines.
cmse_nonsecure_entry: bool
Allows extern "C-cmse-nonsecure-entry" fn()
.
const_async_blocks: bool
Allows async {}
expressions in const contexts.
const_closures: bool
Allows const || {}
closures in const contexts.
const_for: bool
Allows for _ in _
loops in const contexts.
const_precise_live_drops: bool
Be more precise when looking for live drops in a const context.
const_trait_impl: bool
Allows impl const Trait for T
syntax.
const_try: bool
Allows the ?
operator in const contexts.
coroutine_clone: bool
Allows coroutines to be cloned.
coroutines: bool
Allows defining coroutines.
coverage_attribute: bool
Allows function attribute #[coverage(on/off)]
, to control coverage
instrumentation of that function.
custom_inner_attributes: bool
Allows non-builtin attributes in inner attribute position.
custom_test_frameworks: bool
Allows custom test frameworks with #![test_runner]
and #[test_case]
.
decl_macro: bool
Allows declarative macros 2.0 (macro
).
deprecated_safe: bool
Allows using #[deprecated_safe]
to deprecate the safeness of a function or trait
deprecated_suggestion: bool
Allows having using suggestion
in the #[deprecated]
attribute.
deref_patterns: bool
Allows deref patterns.
derive_smart_pointer: bool
Allows deriving SmartPointer
traits
do_not_recommend: bool
Controls errors in trait implementations.
doc_auto_cfg: bool
Tells rustdoc to automatically generate #[doc(cfg(...))]
.
doc_cfg: bool
Allows #[doc(cfg(...))]
.
doc_cfg_hide: bool
Allows #[doc(cfg_hide(...))]
.
doc_masked: bool
Allows #[doc(masked)]
.
dyn_star: bool
Allows dyn* Trait
objects.
effects: bool
Uses generic effect parameters for ~const bounds
exhaustive_patterns: bool
Allows exhaustive pattern matching on types that contain uninhabited types.
explicit_tail_calls: bool
Allows explicit tail calls via become
expression.
extended_varargs_abi_support: bool
Allows using efiapi
, sysv64
and win64
as calling convention
for functions with varargs.
extern_types: bool
Allows defining extern type
s.
f128: bool
Allow using 128-bit (quad precision) floating point numbers.
f16: bool
Allow using 16-bit (half precision) floating point numbers.
ffi_const: bool
Allows the use of #[ffi_const]
on foreign functions.
ffi_pure: bool
Allows the use of #[ffi_pure]
on foreign functions.
fmt_debug: bool
Controlling the behavior of fmt::Debug
fn_align: bool
Allows using #[repr(align(...))]
on function items
fn_delegation: bool
Support delegating implementation of functions to other already implemented functions.
freeze_impls: bool
Allows impls for the Freeze trait.
gen_blocks: bool
Allows defining gen blocks and gen fn
.
generic_arg_infer: bool
Infer generic args for both consts and types.
generic_associated_types_extended: bool
An extension to the generic_associated_types
feature, allowing incomplete features.
generic_const_exprs: bool
Allows non-trivial generic constants which have to have wfness manually propagated to callers
generic_const_items: bool
Allows generic parameters and where-clauses on free & associated const items.
global_registration: bool
Allows registering static items globally, possibly across crates, to iterate over at runtime.
half_open_range_patterns_in_slices: bool
Allows using ..=X
as a patterns in slices.
if_let_guard: bool
Allows if let
guard in match arms.
if_let_rescope: bool
Rescoping temporaries in if let
to align with Rust 2024.
impl_trait_in_assoc_type: bool
Allows impl Trait
to be used inside associated types (RFC 2515).
impl_trait_in_fn_trait_return: bool
Allows impl Trait
as output type in Fn
traits in return position of functions.
inherent_associated_types: bool
Allows associated types in inherent impls.
inline_const_pat: bool
Allow anonymous constants from an inline const
block in pattern position
intra_doc_pointers: bool
Allows using pointer
and reference
in intra-doc links
large_assignments: bool
§lazy_type_alias: bool
Allow to have type alias types for inter-crate use.
let_chains: bool
Allows if/while p && let q = r && ...
chains.
link_arg_attribute: bool
Allows using #[link(kind = "link-arg", name = "...")]
to pass custom arguments to the linker.
macro_metavar_expr: bool
Give access to additional metadata about declarative macro meta-variables.
macro_metavar_expr_concat: bool
Provides a way to concatenate identifiers using metavariable expressions.
marker_trait_attr: bool
Allows #[marker]
on certain traits allowing overlapping implementations.
min_specialization: bool
A minimal, sound subset of specialization intended to be used by the standard library until the soundness issues with specialization are fixed.
more_qualified_paths: bool
Allows qualified paths in struct expressions, struct patterns and tuple struct patterns.
must_not_suspend: bool
Allows the #[must_not_suspend]
attribute.
mut_ref: bool
Allows mut ref
and mut ref mut
identifier patterns.
naked_functions: bool
Allows using #[naked]
on functions.
native_link_modifiers_as_needed: bool
Allows specifying the as-needed link modifier
negative_impls: bool
Allow negative trait implementations.
never_patterns: bool
Allows the !
pattern.
never_type: bool
Allows the !
type. Does not imply ‘exhaustive_patterns’ (below) any more.
never_type_fallback: bool
Allows diverging expressions to fall back to !
rather than ()
.
no_core: bool
Allows #![no_core]
.
no_sanitize: bool
Allows the use of no_sanitize
attribute.
non_exhaustive_omitted_patterns_lint: bool
Allows using the non_exhaustive_omitted_patterns
lint.
non_lifetime_binders: bool
Allows for<T>
binders in where-clauses
object_safe_for_dispatch: bool
Allows making dyn Trait
well-formed even if Trait
is not dyn-compatible1.
In that case, dyn Trait: Trait
does not hold. Moreover, coercions and
casts in safe Rust to dyn Trait
for such a Trait
is also forbidden.
Formerly known as “object safe”. ↩
offset_of_enum: bool
Allows using enums in offset_of!
offset_of_slice: bool
Allows using fields with slice type in offset_of!
optimize_attribute: bool
Allows using #[optimize(X)]
.
patchable_function_entry: bool
Allows specifying nop padding on functions for dynamic patching.
pin_ergonomics: bool
Experimental features that make Pin
more ergonomic.
postfix_match: bool
Allows postfix match expr.match { ... }
proc_macro_hygiene: bool
Allows macro attributes on expressions, statements and non-inline modules.
ref_pat_eat_one_layer_2024: bool
Makes &
and &mut
patterns eat only one layer of references in Rust 2024.
ref_pat_eat_one_layer_2024_structural: bool
Makes &
and &mut
patterns eat only one layer of references in Rust 2024—structural variant
register_tool: bool
Allows using the #[register_tool]
attribute.
repr128: bool
Allows the #[repr(i128)]
attribute for enums.
repr_simd: bool
Allows repr(simd)
and importing the various simd intrinsics.
result_ffi_guarantees: bool
Allows enums like Result<T, E> to be used across FFI, if T’s niche value can be used to describe E or vise-versa.
return_type_notation: bool
Allows bounding the return type of AFIT/RPITIT.
rust_cold_cc: bool
Allows extern "rust-cold"
.
sha512_sm_x86: bool
Allows use of x86 SHA512, SM3 and SM4 target-features and intrinsics
shorter_tail_lifetimes: bool
Shortern the tail expression lifetime
simd_ffi: bool
Allows the use of SIMD types in functions declared in extern
blocks.
specialization: bool
Allows specialization of implementations (RFC 1210).
stmt_expr_attributes: bool
Allows attributes on expressions and non-item statements.
strict_provenance: bool
Allows lints part of the strict provenance effort.
string_deref_patterns: bool
Allows string patterns to dereference values to match them.
target_feature_11: bool
Allows the use of #[target_feature]
on safe functions.
thread_local: bool
Allows using #[thread_local]
on static
items.
trait_alias: bool
Allows defining trait X = A + B;
alias items.
trait_upcasting: bool
Allows dyn upcasting trait objects via supertraits.
Dyn upcasting is casting, e.g., dyn Foo -> dyn Bar
where Foo: Bar
.
transmute_generic_consts: bool
Allows for transmuting between arrays with sizes that contain generic consts.
transparent_unions: bool
Allows #[repr(transparent)] on unions (RFC 2645).
trivial_bounds: bool
Allows inconsistent bounds in where clauses.
try_blocks: bool
Allows using try {...}
expressions.
type_alias_impl_trait: bool
Allows impl Trait
to be used inside type aliases (RFC 2515).
type_changing_struct_update: bool
Allows creation of instances of a struct by moving fields that have not changed from prior instances of the same struct (RFC #2528)
unnamed_fields: bool
Allows unnamed fields of struct and union type
unsized_const_params: bool
Allows const generic parameters to be defined with types that
are not Sized
, e.g. fn foo<const N: [u8]>() {
.
unsized_fn_params: bool
Allows unsized fn parameters.
unsized_locals: bool
Allows unsized rvalues at arguments and parameters.
unsized_tuple_coercion: bool
Allows unsized tuple coercion.
used_with_arg: bool
Allows using the #[used(linker)]
(or #[used(compiler)]
) attribute.
x86_amx_intrinsics: bool
Allows use of x86 AMX
target-feature attributes and intrinsics
xop_target_feature: bool
Allows use of the xop
target-feature
yeet_expr: bool
Allows do yeet
expressions
Implementations§
source§impl Features
impl Features
pub fn set_declared_lang_feature( &mut self, symbol: Symbol, span: Span, since: Option<Symbol>, )
pub fn set_declared_lib_feature(&mut self, symbol: Symbol, span: Span)
sourcepub fn all_features(&self) -> [u8; 207]
pub fn all_features(&self) -> [u8; 207]
This is intended for hashing the set of active features.
The expectation is that this produces much smaller code than other alternatives.
Note that the total feature count is pretty small, so this is not a huge array.
sourcepub fn declared(&self, feature: Symbol) -> bool
pub fn declared(&self, feature: Symbol) -> bool
Is the given feature explicitly declared, i.e. named in a
#![feature(...)]
within the code?
sourcepub fn active(&self, feature: Symbol) -> bool
pub fn active(&self, feature: Symbol) -> bool
Is the given feature active (enabled by the user)?
Panics if the symbol doesn’t correspond to a declared feature.
sourcepub fn incomplete(&self, feature: Symbol) -> bool
pub fn incomplete(&self, feature: Symbol) -> bool
Some features are known to be incomplete and using them is likely to have unanticipated results, such as compiler crashes. We warn the user about these to alert them.
Trait Implementations§
Auto Trait Implementations§
impl DynSend for Features
impl DynSync for Features
impl Freeze for Features
impl RefUnwindSafe for Features
impl Send for Features
impl Sync for Features
impl Unpin for Features
impl UnwindSafe for Features
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
source§impl<T> CloneToUninit for Twhere
T: Clone,
impl<T> CloneToUninit for Twhere
T: Clone,
source§unsafe fn clone_to_uninit(&self, dst: *mut T)
unsafe fn clone_to_uninit(&self, dst: *mut T)
clone_to_uninit
)source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
source§impl<T> IntoEither for T
impl<T> IntoEither for T
source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left
is true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moresource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left(&self)
returns true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moresource§impl<T> Pointable for T
impl<T> Pointable for T
source§impl<T> WithSubscriber for T
impl<T> WithSubscriber for T
source§fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
source§fn with_current_subscriber(self) -> WithDispatch<Self>
fn with_current_subscriber(self) -> WithDispatch<Self>
impl<'a, T> Captures<'a> for Twhere
T: ?Sized,
Layout§
Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...)
attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.
Size: 288 bytes