Struct rustc_middle::mir::Body

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pub struct Body<'tcx> {
Show 19 fields pub basic_blocks: BasicBlocks<'tcx>, pub phase: MirPhase, pub pass_count: usize, pub source: MirSource<'tcx>, pub source_scopes: IndexVec<SourceScope, SourceScopeData<'tcx>>, pub coroutine: Option<Box<CoroutineInfo<'tcx>>>, pub local_decls: IndexVec<Local, LocalDecl<'tcx>>, pub user_type_annotations: CanonicalUserTypeAnnotations<'tcx>, pub arg_count: usize, pub spread_arg: Option<Local>, pub var_debug_info: Vec<VarDebugInfo<'tcx>>, pub span: Span, pub required_consts: Vec<ConstOperand<'tcx>>, pub mentioned_items: Vec<Spanned<MentionedItem<'tcx>>>, pub is_polymorphic: bool, pub injection_phase: Option<MirPhase>, pub tainted_by_errors: Option<ErrorGuaranteed>, pub coverage_branch_info: Option<Box<BranchInfo>>, pub function_coverage_info: Option<Box<FunctionCoverageInfo>>,
}
Expand description

The lowered representation of a single function.

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§basic_blocks: BasicBlocks<'tcx>

A list of basic blocks. References to basic block use a newtyped index type BasicBlock that indexes into this vector.

§phase: MirPhase

Records how far through the “desugaring and optimization” process this particular MIR has traversed. This is particularly useful when inlining, since in that context we instantiate the promoted constants and add them to our promoted vector – but those promoted items have already been optimized, whereas ours have not. This field allows us to see the difference and forego optimization on the inlined promoted items.

§pass_count: usize

How many passses we have executed since starting the current phase. Used for debug output.

§source: MirSource<'tcx>§source_scopes: IndexVec<SourceScope, SourceScopeData<'tcx>>

A list of source scopes; these are referenced by statements and used for debuginfo. Indexed by a SourceScope.

§coroutine: Option<Box<CoroutineInfo<'tcx>>>

Additional information carried by a MIR body when it is lowered from a coroutine.

Note that the coroutine drop shim, any promoted consts, and other synthetic MIR bodies that come from processing a coroutine body are not typically coroutines themselves, and should probably set this to None to avoid carrying redundant information.

§local_decls: IndexVec<Local, LocalDecl<'tcx>>

Declarations of locals.

The first local is the return value pointer, followed by arg_count locals for the function arguments, followed by any user-declared variables and temporaries.

§user_type_annotations: CanonicalUserTypeAnnotations<'tcx>

User type annotations.

§arg_count: usize

The number of arguments this function takes.

Starting at local 1, arg_count locals will be provided by the caller and can be assumed to be initialized.

If this MIR was built for a constant, this will be 0.

§spread_arg: Option<Local>

Mark an argument local (which must be a tuple) as getting passed as its individual components at the LLVM level.

This is used for the “rust-call” ABI.

§var_debug_info: Vec<VarDebugInfo<'tcx>>

Debug information pertaining to user variables, including captures.

§span: Span

A span representing this MIR, for error reporting.

§required_consts: Vec<ConstOperand<'tcx>>

Constants that are required to evaluate successfully for this MIR to be well-formed. We hold in this field all the constants we are not able to evaluate yet.

This is soundness-critical, we make a guarantee that all consts syntactically mentioned in a function have successfully evaluated if the function ever gets executed at runtime.

§mentioned_items: Vec<Spanned<MentionedItem<'tcx>>>

Further items that were mentioned in this function and hence may become monomorphized, depending on optimizations. We use this to avoid optimization-dependent compile errors: the collector recursively traverses all “mentioned” items and evaluates all their required_consts.

This is not soundness-critical and the contents of this list are not a stable guarantee. All that’s relevant is that this set is optimization-level-independent, and that it includes everything that the collector would consider “used”. (For example, we currently compute this set after drop elaboration, so some drop calls that can never be reached are not considered “mentioned”.) See the documentation of CollectionMode in compiler/rustc_monomorphize/src/collector.rs for more context.

§is_polymorphic: bool

Does this body use generic parameters. This is used for the ConstEvaluatable check.

Note that this does not actually mean that this body is not computable right now. The repeat count in the following example is polymorphic, but can still be evaluated without knowing anything about the type parameter T.

fn test<T>() {
    let _ = [0; std::mem::size_of::<*mut T>()];
}

WARNING: Do not change this flags after the MIR was originally created, even if an optimization removed the last mention of all generic params. We do not want to rely on optimizations and potentially allow things like [u8; std::mem::size_of::<T>() * 0] due to this.

§injection_phase: Option<MirPhase>

The phase at which this MIR should be “injected” into the compilation process.

Everything that comes before this MirPhase should be skipped.

This is only Some if the function that this body comes from was annotated with rustc_custom_mir.

§tainted_by_errors: Option<ErrorGuaranteed>§coverage_branch_info: Option<Box<BranchInfo>>

Branch coverage information collected during MIR building, to be used by the InstrumentCoverage pass.

Only present if branch coverage is enabled and this function is eligible.

§function_coverage_info: Option<Box<FunctionCoverageInfo>>

Per-function coverage information added by the InstrumentCoverage pass, to be used in conjunction with the coverage statements injected into this body’s blocks.

If -Cinstrument-coverage is not active, or if an individual function is not eligible for coverage, then this should always be None.

Implementations§

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impl<'tcx> Body<'tcx>

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pub fn new( source: MirSource<'tcx>, basic_blocks: IndexVec<BasicBlock, BasicBlockData<'tcx>>, source_scopes: IndexVec<SourceScope, SourceScopeData<'tcx>>, local_decls: IndexVec<Local, LocalDecl<'tcx>>, user_type_annotations: CanonicalUserTypeAnnotations<'tcx>, arg_count: usize, var_debug_info: Vec<VarDebugInfo<'tcx>>, span: Span, coroutine: Option<Box<CoroutineInfo<'tcx>>>, tainted_by_errors: Option<ErrorGuaranteed> ) -> Self

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pub fn new_cfg_only( basic_blocks: IndexVec<BasicBlock, BasicBlockData<'tcx>> ) -> Self

Returns a partially initialized MIR body containing only a list of basic blocks.

The returned MIR contains no LocalDecls (even for the return place) or source scopes. It is only useful for testing but cannot be #[cfg(test)] because it is used in a different crate.

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pub fn basic_blocks_mut( &mut self ) -> &mut IndexVec<BasicBlock, BasicBlockData<'tcx>>

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pub fn local_kind(&self, local: Local) -> LocalKind

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pub fn mut_vars_iter<'a>( &'a self ) -> impl Iterator<Item = Local> + Captures<'tcx> + 'a

Returns an iterator over all user-declared mutable locals.

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pub fn mut_vars_and_args_iter<'a>( &'a self ) -> impl Iterator<Item = Local> + Captures<'tcx> + 'a

Returns an iterator over all user-declared mutable arguments and locals.

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pub fn args_iter(&self) -> impl Iterator<Item = Local> + ExactSizeIterator

Returns an iterator over all function arguments.

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pub fn vars_and_temps_iter( &self ) -> impl DoubleEndedIterator<Item = Local> + ExactSizeIterator

Returns an iterator over all user-defined variables and compiler-generated temporaries (all locals that are neither arguments nor the return place).

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pub fn drain_vars_and_temps<'a>( &'a mut self ) -> impl Iterator<Item = LocalDecl<'tcx>> + 'a

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pub fn source_info(&self, location: Location) -> &SourceInfo

Returns the source info associated with location.

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pub fn span_for_ty_context(&self, ty_context: TyContext) -> Span

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pub fn return_ty(&self) -> Ty<'tcx>

Returns the return type; it always return first element from local_decls array.

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pub fn bound_return_ty(&self) -> EarlyBinder<Ty<'tcx>>

Returns the return type; it always return first element from local_decls array.

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pub fn terminator_loc(&self, bb: BasicBlock) -> Location

Gets the location of the terminator for the given block.

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pub fn stmt_at( &self, location: Location ) -> Either<&Statement<'tcx>, &Terminator<'tcx>>

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pub fn yield_ty(&self) -> Option<Ty<'tcx>>

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pub fn resume_ty(&self) -> Option<Ty<'tcx>>

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pub fn coroutine_layout_raw(&self) -> Option<&CoroutineLayout<'tcx>>

Prefer going through TyCtxt::coroutine_layout rather than using this directly.

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pub fn coroutine_drop(&self) -> Option<&Body<'tcx>>

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pub fn coroutine_by_move_body(&self) -> Option<&Body<'tcx>>

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pub fn coroutine_kind(&self) -> Option<CoroutineKind>

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pub fn should_skip(&self) -> bool

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pub fn is_custom_mir(&self) -> bool

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fn try_const_mono_switchint<'a>( tcx: TyCtxt<'tcx>, instance: Instance<'tcx>, block: &'a BasicBlockData<'tcx> ) -> Option<(u128, &'a SwitchTargets)>

If this basic block ends with a TerminatorKind::SwitchInt for which we can evaluate the dimscriminant in monomorphization, we return the discriminant bits and the SwitchTargets, just so the caller doesn’t also have to match on the terminator.

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pub fn caller_location_span<T>( &self, source_info: SourceInfo, caller_location: Option<T>, tcx: TyCtxt<'tcx>, from_span: impl FnOnce(Span) -> T ) -> T

For a Location in this scope, determine what the “caller location” at that point is. This is interesting because of inlining: the #[track_caller] attribute of inlined functions must be honored. Falls back to the tracked_caller value for #[track_caller] functions, or the function’s scope.

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impl<'tcx> ArenaAllocatable<'tcx> for Body<'tcx>

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fn allocate_on<'a>(self, arena: &'a Arena<'tcx>) -> &'a mut Self

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fn allocate_from_iter<'a>( arena: &'a Arena<'tcx>, iter: impl IntoIterator<Item = Self> ) -> &'a mut [Self]

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impl<'tcx> Clone for Body<'tcx>

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fn clone(&self) -> Body<'tcx>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<'tcx> Debug for Body<'tcx>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<D> for &'tcx Body<'tcx>

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fn decode(decoder: &mut D) -> Self

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impl<'tcx, __D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<__D> for Body<'tcx>

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fn decode(__decoder: &mut __D) -> Self

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impl<'tcx, __E: TyEncoder<I = TyCtxt<'tcx>>> Encodable<__E> for Body<'tcx>

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fn encode(&self, __encoder: &mut __E)

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impl<'tcx> HasLocalDecls<'tcx> for Body<'tcx>

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fn local_decls(&self) -> &LocalDecls<'tcx>

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impl<'tcx, '__ctx> HashStable<StableHashingContext<'__ctx>> for Body<'tcx>

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fn hash_stable( &self, __hcx: &mut StableHashingContext<'__ctx>, __hasher: &mut StableHasher )

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impl<'tcx> Index<BasicBlock> for Body<'tcx>

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type Output = BasicBlockData<'tcx>

The returned type after indexing.
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fn index(&self, index: BasicBlock) -> &BasicBlockData<'tcx>

Performs the indexing (container[index]) operation. Read more
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impl<'tcx> IndexMut<BasicBlock> for Body<'tcx>

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fn index_mut(&mut self, index: BasicBlock) -> &mut BasicBlockData<'tcx>

Performs the mutable indexing (container[index]) operation. Read more
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impl ParameterizedOverTcx for Body<'static>

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type Value<'tcx> = Body<'tcx>

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impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> RefDecodable<'tcx, D> for Body<'tcx>

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impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for Body<'tcx>

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fn try_fold_with<__F: FallibleTypeFolder<TyCtxt<'tcx>>>( self, __folder: &mut __F ) -> Result<Self, __F::Error>

The entry point for folding. To fold a value t with a folder f call: t.try_fold_with(f). Read more
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fn fold_with<F>(self, folder: &mut F) -> Self
where F: TypeFolder<I>,

A convenient alternative to try_fold_with for use with infallible folders. Do not override this method, to ensure coherence with try_fold_with.
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impl<'tcx> TypeVisitable<TyCtxt<'tcx>> for Body<'tcx>

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fn visit_with<__V: TypeVisitor<TyCtxt<'tcx>>>( &self, __visitor: &mut __V ) -> __V::Result

The entry point for visiting. To visit a value t with a visitor v call: t.visit_with(v). Read more

Auto Trait Implementations§

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impl<'tcx> !Freeze for Body<'tcx>

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impl<'tcx> !RefUnwindSafe for Body<'tcx>

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impl<'tcx> !Send for Body<'tcx>

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impl<'tcx> !Sync for Body<'tcx>

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impl<'tcx> Unpin for Body<'tcx>

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impl<'tcx> !UnwindSafe for Body<'tcx>

Blanket Implementations§

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impl<T> Aligned for T

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const ALIGN: Alignment = _

Alignment of Self.
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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T, R> CollectAndApply<T, R> for T

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fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to f(&iter.collect::<Vec<_>>()).

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type Output = R

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impl<Tcx, T> DepNodeParams<Tcx> for T
where Tcx: DepContext, T: for<'a> HashStable<StableHashingContext<'a>> + Debug,

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default fn fingerprint_style() -> FingerprintStyle

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default fn to_fingerprint(&self, tcx: Tcx) -> Fingerprint

This method turns the parameters of a DepNodeConstructor into an opaque Fingerprint to be used in DepNode. Not all DepNodeParams support being turned into a Fingerprint (they don’t need to if the corresponding DepNode is anonymous).
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default fn to_debug_str(&self, _: Tcx) -> String

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default fn recover(_: Tcx, _: &DepNode) -> Option<T>

This method tries to recover the query key from the given DepNode, something which is needed when forcing DepNodes during red-green evaluation. The query system will only call this method if fingerprint_style() is not FingerprintStyle::Opaque. It is always valid to return None here, in which case incremental compilation will treat the query as having changed instead of forcing it.
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impl<T> Filterable for T

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fn filterable( self, filter_name: &'static str ) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>

Creates a filterable data provider with the given name for debugging. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<P> IntoQueryParam<P> for P

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impl<'tcx, T> IsSuggestable<'tcx> for T
where T: TypeVisitable<TyCtxt<'tcx>> + TypeFoldable<TyCtxt<'tcx>>,

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fn is_suggestable(self, tcx: TyCtxt<'tcx>, infer_suggestable: bool) -> bool

Whether this makes sense to suggest in a diagnostic. Read more
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fn make_suggestable( self, tcx: TyCtxt<'tcx>, infer_suggestable: bool, placeholder: Option<Ty<'tcx>> ) -> Option<T>

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impl<T> MaybeResult<T> for T

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type Error = !

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fn from(_: Result<T, <T as MaybeResult<T>>::Error>) -> T

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fn to_result(self) -> Result<T, <T as MaybeResult<T>>::Error>

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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<'tcx, T> ToPredicate<'tcx, T> for T

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fn to_predicate(self, _tcx: TyCtxt<'tcx>) -> T

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<I, T> TypeVisitableExt<I> for T
where I: Interner, T: TypeVisitable<I>,

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fn has_type_flags(&self, flags: TypeFlags) -> bool

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fn has_vars_bound_at_or_above(&self, binder: DebruijnIndex) -> bool

Returns true if self has any late-bound regions that are either bound by binder or bound by some binder outside of binder. If binder is ty::INNERMOST, this indicates whether there are any late-bound regions that appear free.
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fn error_reported(&self) -> Result<(), <I as Interner>::ErrorGuaranteed>

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fn has_vars_bound_above(&self, binder: DebruijnIndex) -> bool

Returns true if this type has any regions that escape binder (and hence are not bound by it).
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fn has_escaping_bound_vars(&self) -> bool

Return true if this type has regions that are not a part of the type. For example, for<'a> fn(&'a i32) return false, while fn(&'a i32) would return true. The latter can occur when traversing through the former. Read more
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fn has_aliases(&self) -> bool

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fn has_inherent_projections(&self) -> bool

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fn has_opaque_types(&self) -> bool

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fn has_coroutines(&self) -> bool

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fn references_error(&self) -> bool

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fn has_non_region_param(&self) -> bool

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fn has_infer_regions(&self) -> bool

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fn has_infer_types(&self) -> bool

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fn has_non_region_infer(&self) -> bool

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fn has_infer(&self) -> bool

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fn has_placeholders(&self) -> bool

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fn has_non_region_placeholders(&self) -> bool

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fn has_param(&self) -> bool

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fn has_free_regions(&self) -> bool

“Free” regions in this context means that it has any region that is not (a) erased or (b) late-bound.
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fn has_erased_regions(&self) -> bool

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fn has_erasable_regions(&self) -> bool

True if there are any un-erased free regions.
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fn is_global(&self) -> bool

Indicates whether this value references only ‘global’ generic parameters that are the same regardless of what fn we are in. This is used for caching.
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fn has_bound_regions(&self) -> bool

True if there are any late-bound regions
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fn has_non_region_bound_vars(&self) -> bool

True if there are any late-bound non-region variables
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fn has_bound_vars(&self) -> bool

True if there are any bound variables
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fn still_further_specializable(&self) -> bool

Indicates whether this value still has parameters/placeholders/inference variables which could be replaced later, in a way that would change the results of impl specialization.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<Tcx, T> Value<Tcx> for T
where Tcx: DepContext,

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default fn from_cycle_error( tcx: Tcx, cycle_error: &CycleError, _guar: ErrorGuaranteed ) -> T

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<'a, T> Captures<'a> for T
where T: ?Sized,

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impl<T> ErasedDestructor for T
where T: 'static,

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impl<T> MaybeSendSync for 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: 424 bytes