struct FulfillProcessor<'a, 'tcx> {
    selcx: SelectionContext<'a, 'tcx>,
}

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§selcx: SelectionContext<'a, 'tcx>

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impl<'a, 'tcx> FulfillProcessor<'a, 'tcx>

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fn process_trait_obligation( &mut self, obligation: &PredicateObligation<'tcx>, trait_obligation: PolyTraitObligation<'tcx>, stalled_on: &mut Vec<TyOrConstInferVar<'tcx>> ) -> ProcessResult<PendingPredicateObligation<'tcx>, FulfillmentErrorCode<'tcx>>

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fn process_projection_obligation( &mut self, obligation: &PredicateObligation<'tcx>, project_obligation: PolyProjectionObligation<'tcx>, stalled_on: &mut Vec<TyOrConstInferVar<'tcx>> ) -> ProcessResult<PendingPredicateObligation<'tcx>, FulfillmentErrorCode<'tcx>>

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impl<'a, 'tcx> ObligationProcessor for FulfillProcessor<'a, 'tcx>

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fn skippable_obligations<'b>( &'b self, it: impl Iterator<Item = &'b Self::Obligation> ) -> usize

Compared to needs_process_obligation this and its callees contain some optimizations that come at the price of false negatives.

They

  • reduce branching by covering only the most common case
  • take a read-only view of the unification tables which allows skipping undo_log construction.
  • bail out on value-cache misses in ena to avoid pointer chasing
  • hoist RefCell locking out of the loop
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fn needs_process_obligation( &self, pending_obligation: &Self::Obligation ) -> bool

Identifies whether a predicate obligation needs processing.

This is always inlined because it has a single callsite and it is called very frequently. Be careful modifying this code! Several compile-time benchmarks are very sensitive to even small changes.

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fn process_obligation( &mut self, pending_obligation: &mut PendingPredicateObligation<'tcx> ) -> ProcessResult<PendingPredicateObligation<'tcx>, FulfillmentErrorCode<'tcx>>

Processes a predicate obligation and returns either:

  • Changed(v) if the predicate is true, presuming that v are also true
  • Unchanged if we don’t have enough info to be sure
  • Error(e) if the predicate does not hold

This is called much less often than needs_process_obligation, so we never inline it.

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type Obligation = PendingPredicateObligation<'tcx>

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type Error = FulfillmentErrorCode<'tcx>

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type OUT = Outcome<PendingPredicateObligation<'tcx>, FulfillmentErrorCode<'tcx>>

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fn process_backedge<'c, I>( &mut self, cycle: I, _marker: PhantomData<&'c PendingPredicateObligation<'tcx>> ) -> Result<(), FulfillmentErrorCode<'tcx>>where I: Clone + Iterator<Item = &'c PendingPredicateObligation<'tcx>>,

As we do the cycle check, we invoke this callback when we encounter an actual cycle. cycle is an iterator that starts at the start of the cycle in the stack and walks toward the top. Read more

Auto Trait Implementations§

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impl<'a, 'tcx> !RefUnwindSafe for FulfillProcessor<'a, 'tcx>

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impl<'a, 'tcx> !Send for FulfillProcessor<'a, 'tcx>

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impl<'a, 'tcx> !Sync for FulfillProcessor<'a, 'tcx>

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impl<'a, 'tcx> Unpin for FulfillProcessor<'a, 'tcx>

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impl<'a, 'tcx> !UnwindSafe for FulfillProcessor<'a, 'tcx>

Blanket Implementations§

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impl<T> Any for Twhere 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 Twhere 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 Twhere 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> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere 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, U> TryFrom<U> for Twhere 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 Twhere 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.

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: 152 bytes