Struct rustc_feature::active::Features
source · pub struct Features {Show 199 fields
pub declared_lang_features: Vec<(Symbol, Span, Option<Symbol>)>,
pub declared_lib_features: Vec<(Symbol, Span)>,
pub active_features: FxHashSet<Symbol>,
pub abi_unadjusted: bool,
pub abi_vectorcall: 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 link_cfg: bool,
pub multiple_supertrait_upcastable: bool,
pub negative_bounds: bool,
pub omit_gdb_pretty_printer_section: bool,
pub prelude_import: bool,
pub profiler_runtime: bool,
pub rustc_attrs: bool,
pub staged_api: bool,
pub test_2018_feature: bool,
pub test_unstable_lint: bool,
pub unsafe_pin_internals: bool,
pub with_negative_coherence: bool,
pub auto_traits: bool,
pub box_patterns: 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 platform_intrinsics: 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_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 mips_target_feature: bool,
pub powerpc_target_feature: bool,
pub riscv_target_feature: bool,
pub rtm_target_feature: bool,
pub sse4a_target_feature: bool,
pub tbm_target_feature: bool,
pub wasm_target_feature: bool,
pub abi_amdgpu_kernel: 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 asm_const: bool,
pub asm_experimental_arch: bool,
pub asm_unwind: bool,
pub associated_const_equality: bool,
pub associated_type_bounds: bool,
pub associated_type_defaults: bool,
pub async_closure: bool,
pub async_fn_in_trait: bool,
pub async_fn_track_caller: bool,
pub builtin_syntax: bool,
pub c_str_literals: bool,
pub c_unwind: bool,
pub c_variadic: bool,
pub cfg_overflow_checks: bool,
pub cfg_relocation_model: bool,
pub cfg_sanitize: bool,
pub cfg_target_abi: 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_version: bool,
pub cfi_encoding: bool,
pub closure_lifetime_binder: bool,
pub closure_track_caller: bool,
pub cmse_nonsecure_entry: bool,
pub collapse_debuginfo: bool,
pub const_async_blocks: bool,
pub const_closures: bool,
pub const_extern_fn: bool,
pub const_fn_floating_point_arithmetic: bool,
pub const_for: bool,
pub const_mut_refs: bool,
pub const_precise_live_drops: bool,
pub const_refs_to_cell: bool,
pub const_trait_impl: bool,
pub const_try: bool,
pub coverage_attribute: bool,
pub custom_code_classes_in_docs: bool,
pub custom_inner_attributes: bool,
pub custom_test_frameworks: bool,
pub decl_macro: bool,
pub default_type_parameter_fallback: bool,
pub deprecated_safe: bool,
pub deprecated_suggestion: bool,
pub diagnostic_namespace: 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 exclusive_range_pattern: bool,
pub exhaustive_patterns: bool,
pub explicit_tail_calls: bool,
pub extended_varargs_abi_support: bool,
pub extern_types: bool,
pub ffi_const: bool,
pub ffi_pure: bool,
pub ffi_returns_twice: bool,
pub fn_align: bool,
pub generator_clone: bool,
pub generators: bool,
pub generic_arg_infer: bool,
pub generic_associated_types_extended: bool,
pub generic_const_exprs: bool,
pub generic_const_items: bool,
pub half_open_range_patterns_in_slices: bool,
pub if_let_guard: bool,
pub impl_trait_in_assoc_type: bool,
pub impl_trait_in_fn_trait_return: bool,
pub imported_main: bool,
pub inherent_associated_types: bool,
pub inline_const: 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 lint_reasons: bool,
pub macro_metavar_expr: bool,
pub marker_trait_attr: bool,
pub min_specialization: bool,
pub more_qualified_paths: bool,
pub must_not_suspend: bool,
pub naked_functions: bool,
pub native_link_modifiers_as_needed: bool,
pub negative_impls: 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 optimize_attribute: bool,
pub plugin: bool,
pub precise_pointer_size_matching: bool,
pub proc_macro_hygiene: bool,
pub raw_ref_op: bool,
pub register_tool: bool,
pub repr128: bool,
pub repr_simd: bool,
pub return_position_impl_trait_in_trait: bool,
pub return_type_notation: bool,
pub rust_cold_cc: 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_ascription: bool,
pub type_changing_struct_update: bool,
pub type_privacy_lints: bool,
pub unix_sigpipe: bool,
pub unnamed_fields: bool,
pub unsized_fn_params: bool,
pub unsized_locals: bool,
pub unsized_tuple_coercion: bool,
pub used_with_arg: bool,
pub wasm_abi: 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_lib_features: Vec<(Symbol, Span)>
#![feature]
attrs for non-language (library) features.
active_features: FxHashSet<Symbol>
Features enabled for this crate.
abi_unadjusted: bool
Allows using the unadjusted
ABI; perma-unstable.
abi_vectorcall: bool
Allows using the vectorcall
ABI.
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.
link_cfg: bool
Allows #[link(..., cfg(..))]
; perma-unstable per #37406
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]
.
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_2018_feature: bool
Added for testing E0705; perma-unstable.
test_unstable_lint: bool
Added for testing unstable lints; perma-unstable.
unsafe_pin_internals: bool
Allows non-unsafe
—and thus, unsound— access to Pin
constructions.
Marked internal
since perma-unstable and unsound.
with_negative_coherence: bool
Use for stable + negative coherence and strict coherence depending on trait’s rustc_strict_coherence value.
auto_traits: bool
Allows features specific to auto traits.
Renamed from optin_builtin_traits
.
box_patterns: bool
Allows using box
in patterns (RFC 469).
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.
platform_intrinsics: bool
Allows extern "platform-intrinsic" { ... }
.
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_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
§mips_target_feature: bool
§powerpc_target_feature: bool
§riscv_target_feature: bool
§rtm_target_feature: bool
§sse4a_target_feature: bool
§tbm_target_feature: bool
§wasm_target_feature: bool
§abi_amdgpu_kernel: bool
Allows using the amdgpu-kernel
ABI.
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 &'static str
or user defined types
alloc_error_handler: bool
Allows defining an #[alloc_error_handler]
.
arbitrary_self_types: bool
Allows trait methods with arbitrary self types.
asm_const: bool
Allows using const
operands in inline assembly.
asm_experimental_arch: bool
Enables experimental inline assembly support for additional architectures.
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_bounds: bool
Allows the user of associated type bounds.
associated_type_defaults: bool
Allows associated type defaults.
async_closure: bool
Allows async || body
closures.
async_fn_in_trait: bool
Allows async functions to be declared, implemented, and used in traits.
async_fn_track_caller: bool
Allows #[track_caller]
on async functions.
builtin_syntax: bool
Allows builtin # foo() syntax
c_str_literals: bool
Allows c"foo"
literals.
c_unwind: bool
Treat extern "C"
function as nounwind.
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_target_abi: bool
Allows cfg(target_abi = "...")
.
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_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 generators.
closure_track_caller: bool
Allows #[track_caller]
on closures and generators.
cmse_nonsecure_entry: bool
Allows to use the #[cmse_nonsecure_entry]
attribute.
collapse_debuginfo: bool
Allows use of the #[collapse_debuginfo]
attribute.
const_async_blocks: bool
Allows async {}
expressions in const contexts.
const_closures: bool
Allows const || {}
closures in const contexts.
const_extern_fn: bool
Allows the definition of const extern fn
and const unsafe extern fn
.
const_fn_floating_point_arithmetic: bool
Allows basic arithmetic on floating point types in a const fn
.
const_for: bool
Allows for _ in _
loops in const contexts.
const_mut_refs: bool
Allows using &mut
in constant functions.
const_precise_live_drops: bool
Be more precise when looking for live drops in a const context.
const_refs_to_cell: bool
Allows references to types with interior mutability within constants
const_trait_impl: bool
Allows impl const Trait for T
syntax.
const_try: bool
Allows the ?
operator in const contexts.
coverage_attribute: bool
Allows function attribute #[coverage(on/off)]
, to control coverage
instrumentation of that function.
custom_code_classes_in_docs: bool
Allows users to provide classes for fenced code block using class:classname
.
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
).
default_type_parameter_fallback: bool
Allows default type parameters to influence type inference.
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.
diagnostic_namespace: bool
Allows using the #[diagnostic]
attribute tool namespace
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
§exclusive_range_pattern: bool
Allows X..Y
patterns.
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.
ffi_const: bool
Allows the use of #[ffi_const]
on foreign functions.
ffi_pure: bool
Allows the use of #[ffi_pure]
on foreign functions.
ffi_returns_twice: bool
Allows using #[ffi_returns_twice]
on foreign functions.
fn_align: bool
Allows using #[repr(align(...))]
on function items
generator_clone: bool
Allows generators to be cloned.
generators: bool
Allows defining generators.
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.
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.
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.
imported_main: bool
Allows using imported main
function
inherent_associated_types: bool
Allows associated types in inherent impls.
inline_const: bool
Allow anonymous constants from an inline const
block
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.
lint_reasons: bool
Allows using reason
in lint attributes and the #[expect(lint)]
lint check.
macro_metavar_expr: bool
Give access to additional metadata about declarative macro meta-variables.
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.
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_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 object safe.
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.
optimize_attribute: bool
Allows using #[optimize(X)]
.
plugin: bool
Allows using #![plugin(myplugin)]
.
precise_pointer_size_matching: bool
Allows exhaustive integer pattern matching on usize
and isize
.
proc_macro_hygiene: bool
Allows macro attributes on expressions, statements and non-inline modules.
raw_ref_op: bool
Allows &raw const $place_expr
and &raw mut $place_expr
expressions.
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.
return_position_impl_trait_in_trait: bool
Allows return-position impl Trait
in traits.
return_type_notation: bool
Allows bounding the return type of AFIT/RPITIT.
rust_cold_cc: bool
Allows extern "rust-cold"
.
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_ascription: bool
Allows the use of type ascription in expressions.
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)
type_privacy_lints: bool
Allows using type privacy lints (private_interfaces
, private_bounds
, unnameable_types
).
unix_sigpipe: bool
Enables rustc to generate code that instructs libstd to NOT ignore SIGPIPE.
unnamed_fields: bool
Allows unnamed fields of struct and union type
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.
wasm_abi: bool
Allows extern "wasm" fn
yeet_expr: bool
Allows do yeet
expressions
Implementations§
source§impl Features
impl Features
pub fn walk_feature_fields(&self, f: impl FnMut(&str, bool))
sourcepub fn enabled(&self, feature: Symbol) -> bool
pub fn enabled(&self, feature: Symbol) -> bool
Is the given feature enabled?
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 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
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: 280 bytes