Enum halo2_frontend::dev::VerifyFailure

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pub enum VerifyFailure {
    CellNotAssigned {
        gate: Gate,
        region: Region,
        gate_offset: usize,
        column: Column<Any>,
        offset: isize,
    },
    InstanceCellNotAssigned {
        gate: Gate,
        region: Region,
        gate_offset: usize,
        column: Column<Instance>,
        row: usize,
    },
    ConstraintNotSatisfied {
        constraint: Constraint,
        location: FailureLocation,
        cell_values: Vec<(VirtualCell, String)>,
    },
    ConstraintPoisoned {
        constraint: Constraint,
    },
    Lookup {
        name: String,
        lookup_index: usize,
        location: FailureLocation,
    },
    Shuffle {
        name: String,
        shuffle_index: usize,
        location: FailureLocation,
    },
    Permutation {
        column: Column,
        location: FailureLocation,
    },
}
Expand description

The reasons why a particular circuit is not satisfied.

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CellNotAssigned

A cell used in an active gate was not assigned to.

Fields

§gate: Gate

The index of the active gate.

§region: Region

The region in which this cell should be assigned.

§gate_offset: usize

The offset (relative to the start of the region) at which the active gate queries this cell.

§column: Column<Any>

The column in which this cell should be assigned.

§offset: isize

The offset (relative to the start of the region) at which this cell should be assigned. This may be negative (for example, if a selector enables a gate at offset 0, but the gate uses Rotation::prev()).

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InstanceCellNotAssigned

An instance cell used in an active gate was not assigned to.

Fields

§gate: Gate

The index of the active gate.

§region: Region

The region in which this gate was activated.

§gate_offset: usize

The offset (relative to the start of the region) at which the active gate queries this cell.

§column: Column<Instance>

The column in which this cell should be assigned.

§row: usize

The absolute row at which this cell should be assigned.

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ConstraintNotSatisfied

A constraint was not satisfied for a particular row.

Fields

§constraint: Constraint

The polynomial constraint that is not satisfied.

§location: FailureLocation

The location at which this constraint is not satisfied.

FailureLocation::OutsideRegion is usually caused by a constraint that does not contain a selector, and as a result is active on every row.

§cell_values: Vec<(VirtualCell, String)>

The values of the virtual cells used by this constraint.

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ConstraintPoisoned

A constraint was active on an unusable row, and is likely missing a selector.

Fields

§constraint: Constraint

The polynomial constraint that is not satisfied.

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Lookup

A lookup input did not exist in its corresponding table.

Fields

§name: String

The name of the lookup that is not satisfied.

§lookup_index: usize

The index of the lookup that is not satisfied. These indices are assigned in the order in which ConstraintSystem::lookup is called during Circuit::configure.

§location: FailureLocation

The location at which the lookup is not satisfied.

FailureLocation::InRegion is most common, and may be due to the intentional use of a lookup (if its inputs are conditional on a complex selector), or an unintentional lookup constraint that overlaps the region (indicating that the lookup’s inputs should be made conditional).

FailureLocation::OutsideRegion is uncommon, and could mean that:

  • The input expressions do not correctly constrain a default value that exists in the table when the lookup is not being used.
  • The input expressions use a column queried at a non-zero Rotation, and the lookup is active on a row adjacent to an unrelated region.
§

Shuffle

A shuffle input did not exist in its corresponding map.

Fields

§name: String

The name of the lookup that is not satisfied.

§shuffle_index: usize

The index of the lookup that is not satisfied. These indices are assigned in the order in which ConstraintSystem::lookup is called during Circuit::configure.

§location: FailureLocation

The location at which the lookup is not satisfied.

FailureLocation::InRegion is most common, and may be due to the intentional use of a lookup (if its inputs are conditional on a complex selector), or an unintentional lookup constraint that overlaps the region (indicating that the lookup’s inputs should be made conditional).

FailureLocation::OutsideRegion is uncommon, and could mean that:

  • The input expressions do not correctly constrain a default value that exists in the table when the lookup is not being used.
  • The input expressions use a column queried at a non-zero Rotation, and the lookup is active on a row adjacent to an unrelated region.
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Permutation

A permutation did not preserve the original value of a cell.

Fields

§column: Column

The column in which this permutation is not satisfied.

§location: FailureLocation

The location at which the permutation is not satisfied.

Implementations§

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impl VerifyFailure

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pub fn emit<F: Field>(&self, prover: &MockProver<F>)

Emits this failure in pretty-printed format to stderr.

Trait Implementations§

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impl Clone for VerifyFailure

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fn clone(&self) -> VerifyFailure

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 VerifyFailure

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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 Display for VerifyFailure

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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 PartialEq for VerifyFailure

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fn eq(&self, other: &VerifyFailure) -> 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 Eq for VerifyFailure

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impl StructuralPartialEq for VerifyFailure

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