Enum rustc_lint_defs::LintExpectationId

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pub enum LintExpectationId {
    Unstable {
        attr_id: AttrId,
        lint_index: Option<u16>,
    },
    Stable {
        hir_id: HirId,
        attr_index: u16,
        lint_index: Option<u16>,
        attr_id: Option<AttrId>,
    },
}
Expand description

Each lint expectation has a LintExpectationId assigned by the LintLevelsBuilder. Expected diagnostics get the lint level Expect which stores the LintExpectationId to match it with the actual expectation later on.

The LintExpectationId has to be stable between compilations, as diagnostic instances might be loaded from cache. Lint messages can be emitted during an EarlyLintPass operating on the AST and during a LateLintPass traversing the HIR tree. The AST doesn’t have enough information to create a stable id. The LintExpectationId will instead store the AttrId defining the expectation. These LintExpectationId will be updated to use the stable [HirId] once the AST has been lowered. The transformation is done by the LintLevelsBuilder

Each lint inside the expect attribute is tracked individually, the lint_index identifies the lint inside the attribute and ensures that the IDs are unique.

The index values have a type of u16 to reduce the size of the LintExpectationId. It’s reasonable to assume that no user will define 2^16 attributes on one node or have that amount of lints listed. u16 values should therefore suffice.

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Unstable

Used for lints emitted during the EarlyLintPass. This id is not hash stable and should not be cached.

Fields

§attr_id: AttrId
§lint_index: Option<u16>
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Stable

The [HirId] that the lint expectation is attached to. This id is stable and can be cached. The additional index ensures that nodes with several expectations can correctly match diagnostics to the individual expectation.

Fields

§hir_id: HirId
§attr_index: u16
§lint_index: Option<u16>
§attr_id: Option<AttrId>

Implementations§

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impl LintExpectationId

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pub fn is_stable(&self) -> bool

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pub fn get_lint_index(&self) -> Option<u16>

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pub fn set_lint_index(&mut self, new_lint_index: Option<u16>)

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pub fn normalize(self) -> Self

Prepares the id for hashing. Removes references to the ast. Should only be called when the id is stable.

Trait Implementations§

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impl Clone for LintExpectationId

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fn clone(&self) -> LintExpectationId

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 Debug for LintExpectationId

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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<__D: SpanDecoder> Decodable<__D> for LintExpectationId

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

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impl<__E: SpanEncoder> Encodable<__E> for LintExpectationId

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

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impl Hash for LintExpectationId

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl<HCX: HashStableContext> HashStable<HCX> for LintExpectationId

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fn hash_stable(&self, hcx: &mut HCX, hasher: &mut StableHasher)

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impl Ord for LintExpectationId

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fn cmp(&self, other: &LintExpectationId) -> Ordering

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized + PartialOrd,

Restrict a value to a certain interval. Read more
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impl PartialEq for LintExpectationId

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fn eq(&self, other: &LintExpectationId) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl PartialOrd for LintExpectationId

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fn partial_cmp(&self, other: &LintExpectationId) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl<HCX: HashStableContext> ToStableHashKey<HCX> for LintExpectationId

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type KeyType = (HirId, u16, u16)

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fn to_stable_hash_key(&self, _: &HCX) -> Self::KeyType

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impl Copy for LintExpectationId

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impl Eq for LintExpectationId

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impl StructuralPartialEq for LintExpectationId

Auto Trait Implementations§

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> AnyEq for T
where T: Any + PartialEq,

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fn equals(&self, other: &(dyn Any + 'static)) -> bool

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fn as_any(&self) -> &(dyn Any + 'static)

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impl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for T
where T: Copy,

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fn allocate_on<'a>(self, arena: &'a Arena<'tcx>) -> &'a mut T

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fn allocate_from_iter<'a>( arena: &'a Arena<'tcx>, iter: impl IntoIterator<Item = T> ) -> &'a mut [T]

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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<Q, K> Comparable<K> for Q
where Q: Ord + ?Sized, K: Borrow<Q> + ?Sized,

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fn compare(&self, key: &K) -> Ordering

Compare self to key and return their ordering.
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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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<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

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impl<T> Same for T

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type Output = T

Should always be Self
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where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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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<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<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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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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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
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where T: 'static,

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where T: Send + Sync,

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: 20 bytes

Size for each variant:

  • Unstable: 10 bytes
  • Stable: 18 bytes