Safe Haskell	None
Language	GHC2021

Singular.Registry.TrieState

Description

Application proofs for one registry's independently selected state. Unbound selections record observations without promising an atomic ledger snapshot. Coverage is checked from create and reproduced trie-changing roots.

Synopsis

newtype StatePolicyId = StatePolicyId ByteString
data RegistryIdentity = RegistryIdentity StatePolicyId AssetName
newtype SessionId = SessionId Text
data SessionBinding
- = Unbound
- | Bound Integer ByteString
data StatePoint = StatePoint {
- pointSession :: SessionId
- pointBinding :: SessionBinding
- pointOutput :: TxIn
}
data TrieSelection = TrieSelection {
- trieSelectionIdentity :: RegistryIdentity
- trieSelectionPoint :: StatePoint
- trieSelectionRoot :: Root
}
data TrieState (m :: Type -> Type) = TrieState {
- withTrieState :: forall a. TrieSelection -> (TrieSnapshot m -> m a) -> m (Either TrieFailure a)
- acceptObservedFold :: ObservedFold -> m (Either TrieFailure ())
}
data TrieSnapshot (m :: Type -> Type)
trieIdentity :: forall (m :: Type -> Type). TrieSnapshot m -> RegistryIdentity
triePoint :: forall (m :: Type -> Type). TrieSnapshot m -> StatePoint
trieRoot :: forall (m :: Type -> Type). TrieSnapshot m -> Root
trieCoverage :: forall (m :: Type -> Type). TrieSnapshot m -> CompleteFromCreate
trieLineage :: forall (m :: Type -> Type). TrieSnapshot m -> Maybe PublicLineage
leafAt :: TrieSnapshot m -> ByteString -> m (Either TrieFailure Leaf)
membership :: TrieSnapshot m -> ByteString -> Leaf -> m (Either TrieFailure MembershipProof)
nonMembership :: TrieSnapshot m -> ByteString -> m (Either TrieFailure NonMembershipProof)
speculateEdges :: TrieSnapshot m -> NonEmpty (ByteString, Integer) -> m (Either TrieFailure SpeculativeWalk)
data Leaf
- = Unknown
- | Absent
- | Active
- | Terminal
leafName :: Leaf -> Text
data TrieFailure
- = HistoryIncomplete RegistryIdentity (Maybe TxId) Incomplete
- | RootDoesNotChain RegistryIdentity (Maybe TxId) Parting
- | UndecodableRequest RegistryIdentity (Maybe TxId) Undecodable
- | WrongRegistry RegistryIdentity (Maybe TxId) Mismatch
- | StaleState RegistryIdentity (Maybe TxId) Staleness
- | MissingProof RegistryIdentity Missing
data Parting
- = RootsPart Root Root
- | UnreadableRoot Text
data Incomplete
- = MissingTransaction
- | ProviderHistoryFailure HistoryFailure
- | UnresolvedInput TxIn
- | ConflictingResolution TxIn
- | ConflictingCopies
- | NoStateInput
- | ForkedStateOutput TxIn
- | OutsideLineage
data Undecodable
- = UndecodableStateOutput
- | MissingRedeemer
- | NotModify
- | ActionCount Int Int
- | EdgeOutOfRange Integer
- | UnreadableRecord Text
data Mismatch
- = SelectionNotState
- | CreateMint
- | SeedNotSpent
- | SeedName
- | CreateOutput
- | OtherRegistry RegistryIdentity
- | UnknownRegistry
data Staleness
- = StaleRoot Root Root
- | StaleSelection TrieSelection TrieSelection
- | StaleOutput TxIn TxIn
- | NoSelection
data Missing
- = NoProofFor ByteString
- | NoLocalTrie
failureRegistry :: TrieFailure -> RegistryIdentity
failureTransaction :: TrieFailure -> Maybe TxId
trieFailureName :: TrieFailure -> Text
trieFailureFields :: TrieFailure -> [(Text, Value)]
data CompleteFromCreate
coverageTransitions :: CompleteFromCreate -> Int
data MembershipProof
membershipBytes :: MembershipProof -> ByteString
data NonMembershipProof
verifyNonMembership :: NonMembershipProof -> Root -> ByteString -> Bool
data PublicLineage = PublicLineage {
- lineageCreate :: TxId
- lineageFolds :: [TxId]
- lineageKeys :: [ByteString]
}
data SpeculativeWalk
walkRoot :: SpeculativeWalk -> Root
walkProofs :: SpeculativeWalk -> [[ProofStep]]
data CreateRecord = CreateRecord RegistryIdentity TxIn
data ObservedFold = ObservedFold TrieSelection TrieSelection (NonEmpty (ByteString, Integer))
data TrieObservation
- = Created TrieSelection
- | Selected TrieSelection
- | LeafRead TrieSelection ByteString Leaf
- | MemberProved TrieSelection ByteString Leaf ByteString
- | AbsenceProved TrieSelection ByteString
- | Speculated TrieSelection SpeculativeWalk
- | FoldAccepted TrieSelection TrieSelection

Documentation

newtype StatePolicyId Source #

Constructors

StatePolicyId ByteString

Instances

Instances details

Show StatePolicyId Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods showsPrec :: Int -> StatePolicyId -> ShowS Source # show :: StatePolicyId -> String Source # showList :: [StatePolicyId] -> ShowS Source #
Eq StatePolicyId Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods (==) :: StatePolicyId -> StatePolicyId -> Bool Source # (/=) :: StatePolicyId -> StatePolicyId -> Bool Source #
Ord StatePolicyId Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods compare :: StatePolicyId -> StatePolicyId -> Ordering Source # (<) :: StatePolicyId -> StatePolicyId -> Bool Source # (<=) :: StatePolicyId -> StatePolicyId -> Bool Source # (>) :: StatePolicyId -> StatePolicyId -> Bool Source # (>=) :: StatePolicyId -> StatePolicyId -> Bool Source # max :: StatePolicyId -> StatePolicyId -> StatePolicyId Source # min :: StatePolicyId -> StatePolicyId -> StatePolicyId Source #

data RegistryIdentity Source #

Constructors

RegistryIdentity StatePolicyId AssetName

Instances

Instances details

Show RegistryIdentity Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods showsPrec :: Int -> RegistryIdentity -> ShowS Source # show :: RegistryIdentity -> String Source # showList :: [RegistryIdentity] -> ShowS Source #
Eq RegistryIdentity Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods (==) :: RegistryIdentity -> RegistryIdentity -> Bool Source # (/=) :: RegistryIdentity -> RegistryIdentity -> Bool Source #
Ord RegistryIdentity Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods compare :: RegistryIdentity -> RegistryIdentity -> Ordering Source # (<) :: RegistryIdentity -> RegistryIdentity -> Bool Source # (<=) :: RegistryIdentity -> RegistryIdentity -> Bool Source # (>) :: RegistryIdentity -> RegistryIdentity -> Bool Source # (>=) :: RegistryIdentity -> RegistryIdentity -> Bool Source # max :: RegistryIdentity -> RegistryIdentity -> RegistryIdentity Source # min :: RegistryIdentity -> RegistryIdentity -> RegistryIdentity Source #

newtype SessionId #

Constructors

SessionId Text

Instances

Instances details

Show SessionId #
Instance details Defined in Singular.Registry.Evidence Methods showsPrec :: Int -> SessionId -> ShowS Source # show :: SessionId -> String Source # showList :: [SessionId] -> ShowS Source #
Eq SessionId #
Instance details Defined in Singular.Registry.Evidence Methods (==) :: SessionId -> SessionId -> Bool Source # (/=) :: SessionId -> SessionId -> Bool Source #
Ord SessionId #
Instance details Defined in Singular.Registry.Evidence Methods compare :: SessionId -> SessionId -> Ordering Source # (<) :: SessionId -> SessionId -> Bool Source # (<=) :: SessionId -> SessionId -> Bool Source # (>) :: SessionId -> SessionId -> Bool Source # (>=) :: SessionId -> SessionId -> Bool Source # max :: SessionId -> SessionId -> SessionId Source # min :: SessionId -> SessionId -> SessionId Source #

data SessionBinding #

Constructors

Unbound
Bound Integer ByteString

Instances

Instances details

Show SessionBinding #
Instance details Defined in Singular.Registry.Evidence Methods showsPrec :: Int -> SessionBinding -> ShowS Source # show :: SessionBinding -> String Source # showList :: [SessionBinding] -> ShowS Source #
Eq SessionBinding #
Instance details Defined in Singular.Registry.Evidence Methods (==) :: SessionBinding -> SessionBinding -> Bool Source # (/=) :: SessionBinding -> SessionBinding -> Bool Source #

data StatePoint Source #

Constructors

StatePoint
Fields pointSession :: SessionId pointBinding :: SessionBinding pointOutput :: TxIn

Instances

Instances details

Show StatePoint Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods showsPrec :: Int -> StatePoint -> ShowS Source # show :: StatePoint -> String Source # showList :: [StatePoint] -> ShowS Source #
Eq StatePoint Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods (==) :: StatePoint -> StatePoint -> Bool Source # (/=) :: StatePoint -> StatePoint -> Bool Source #

data TrieSelection Source #

Constructors

TrieSelection
Fields trieSelectionIdentity :: RegistryIdentity trieSelectionPoint :: StatePoint trieSelectionRoot :: Root

Instances

Instances details

Show TrieSelection Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods showsPrec :: Int -> TrieSelection -> ShowS Source # show :: TrieSelection -> String Source # showList :: [TrieSelection] -> ShowS Source #
Eq TrieSelection Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods (==) :: TrieSelection -> TrieSelection -> Bool Source # (/=) :: TrieSelection -> TrieSelection -> Bool Source #

data TrieState (m :: Type -> Type) Source #

Constructors

TrieState
Fields withTrieState :: forall a. TrieSelection -> (TrieSnapshot m -> m a) -> m (Either TrieFailure a) acceptObservedFold :: ObservedFold -> m (Either TrieFailure ())

data TrieSnapshot (m :: Type -> Type) Source #

trieIdentity :: forall (m :: Type -> Type). TrieSnapshot m -> RegistryIdentity Source #

triePoint :: forall (m :: Type -> Type). TrieSnapshot m -> StatePoint Source #

trieRoot :: forall (m :: Type -> Type). TrieSnapshot m -> Root Source #

trieCoverage :: forall (m :: Type -> Type). TrieSnapshot m -> CompleteFromCreate Source #

trieLineage :: forall (m :: Type -> Type). TrieSnapshot m -> Maybe PublicLineage Source #

The public lineage the snapshot was replayed from, or nothing for a fixture snapshot.

leafAt :: TrieSnapshot m -> ByteString -> m (Either TrieFailure Leaf) Source #

membership :: TrieSnapshot m -> ByteString -> Leaf -> m (Either TrieFailure MembershipProof) Source #

nonMembership :: TrieSnapshot m -> ByteString -> m (Either TrieFailure NonMembershipProof) Source #

speculateEdges :: TrieSnapshot m -> NonEmpty (ByteString, Integer) -> m (Either TrieFailure SpeculativeWalk) Source #

data Leaf Source #

Constructors

Unknown
Absent
Active
Terminal

Instances

Instances details

Bounded Leaf Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods minBound :: Leaf Source # maxBound :: Leaf Source #
Enum Leaf Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods succ :: Leaf -> Leaf Source # pred :: Leaf -> Leaf Source # toEnum :: Int -> Leaf Source # fromEnum :: Leaf -> Int Source # enumFrom :: Leaf -> [Leaf] Source # enumFromThen :: Leaf -> Leaf -> [Leaf] Source # enumFromTo :: Leaf -> Leaf -> [Leaf] Source # enumFromThenTo :: Leaf -> Leaf -> Leaf -> [Leaf] Source #
Show Leaf Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods showsPrec :: Int -> Leaf -> ShowS Source # show :: Leaf -> String Source # showList :: [Leaf] -> ShowS Source #
Eq Leaf Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods (==) :: Leaf -> Leaf -> Bool Source # (/=) :: Leaf -> Leaf -> Bool Source #

leafName :: Leaf -> Text Source #

data TrieFailure Source #

Why a registry's trie cannot be served, naming what a person needs to act on it: the registry, the transaction where one is known, and the reason. A backend passes what it knows and never invents the rest.

Constructors

HistoryIncomplete RegistryIdentity (Maybe TxId) Incomplete	The history does not reach the selection from `create`.
RootDoesNotChain RegistryIdentity (Maybe TxId) Parting	A rebuilt root is not the recorded one, or a recorded root cannot be read.
UndecodableRequest RegistryIdentity (Maybe TxId) Undecodable	A fold's redeemer, actions, state output or edges cannot be read.
WrongRegistry RegistryIdentity (Maybe TxId) Mismatch	The material is another registry's, or not this registry's state.
StaleState RegistryIdentity (Maybe TxId) Staleness	The selection is not the state the trie is served at.
MissingProof RegistryIdentity Missing	No proof can be given.

Instances

Instances details

Show TrieFailure Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods showsPrec :: Int -> TrieFailure -> ShowS Source # show :: TrieFailure -> String Source # showList :: [TrieFailure] -> ShowS Source #
Eq TrieFailure Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods (==) :: TrieFailure -> TrieFailure -> Bool Source # (/=) :: TrieFailure -> TrieFailure -> Bool Source #

data Parting Source #

How a rebuilt root parts from the recorded one.

Constructors

RootsPart Root Root	The rebuilt root is not the recorded root: rebuilt, recorded.
UnreadableRoot Text	A recorded root cannot be read; the text says which.

Instances

Instances details

Show Parting Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods showsPrec :: Int -> Parting -> ShowS Source # show :: Parting -> String Source # showList :: [Parting] -> ShowS Source #
Eq Parting Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods (==) :: Parting -> Parting -> Bool Source # (/=) :: Parting -> Parting -> Bool Source #

data Incomplete Source #

How a history falls short of the lineage.

Constructors

MissingTransaction	A transaction the lineage spends through is not in the history.
ProviderHistoryFailure HistoryFailure	The acquired provider refused reconstruction; every datum is retained.
UnresolvedInput TxIn	A spent input is resolved neither by the history nor by the map.
ConflictingResolution TxIn	The map resolves an input differently from the transaction that made it.
ConflictingCopies	Two different transactions share one identifier.
NoStateInput	A transaction holds the token but spends no state output and mints none.
ForkedStateOutput TxIn	A state output is spent by two different transactions.
OutsideLineage	A transaction touches the token outside the lineage.

Instances

Instances details

Show Incomplete Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods showsPrec :: Int -> Incomplete -> ShowS Source # show :: Incomplete -> String Source # showList :: [Incomplete] -> ShowS Source #
Eq Incomplete Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods (==) :: Incomplete -> Incomplete -> Bool Source # (/=) :: Incomplete -> Incomplete -> Bool Source #

data Undecodable Source #

What of a fold cannot be read.

Constructors

UndecodableStateOutput	The state output carries no inline state datum, or is not first.
MissingRedeemer	The state input's spend carries no redeemer.
NotModify	The state input's redeemer is not `Modify`.
ActionCount Int Int	Actions given and matching requests found differ in number.
EdgeOutOfRange Integer	An edge outside the seven the registry defines.
UnreadableRecord Text	A local record the history is read from cannot be read; the text says what.

Instances

Instances details

Show Undecodable Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods showsPrec :: Int -> Undecodable -> ShowS Source # show :: Undecodable -> String Source # showList :: [Undecodable] -> ShowS Source #
Eq Undecodable Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods (==) :: Undecodable -> Undecodable -> Bool Source # (/=) :: Undecodable -> Undecodable -> Bool Source #

data Mismatch Source #

How the material differs from the selected registry.

Constructors

SelectionNotState	The output read as the state does not hold exactly the registry's token.
CreateMint	`create` does not mint exactly one token under `Minting(seed)`.
SeedNotSpent	`create` does not spend its seed.
SeedName	The token's name is not `assetName(seed)`.
CreateOutput	`create`'s first output is not the state address holding the token.
OtherRegistry RegistryIdentity	The material names this other registry.
UnknownRegistry	Nothing is held for the registry.

Instances

Instances details

Show Mismatch Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods showsPrec :: Int -> Mismatch -> ShowS Source # show :: Mismatch -> String Source # showList :: [Mismatch] -> ShowS Source #
Eq Mismatch Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods (==) :: Mismatch -> Mismatch -> Bool Source # (/=) :: Mismatch -> Mismatch -> Bool Source #

data Staleness Source #

How the selection differs from the state the trie is served at.

Constructors

StaleRoot Root Root	The selection's root is not the root at its output: selected, at the output.
StaleSelection TrieSelection TrieSelection	The selection is not the one held: selected, held.
StaleOutput TxIn TxIn	The selected output is not the output the history makes: selected, made.
NoSelection	No selection has been made, or the live state could not be read.

Instances

Instances details

Show Staleness Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods showsPrec :: Int -> Staleness -> ShowS Source # show :: Staleness -> String Source # showList :: [Staleness] -> ShowS Source #
Eq Staleness Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods (==) :: Staleness -> Staleness -> Bool Source # (/=) :: Staleness -> Staleness -> Bool Source #

data Missing Source #

What no proof can be given for.

Constructors

NoProofFor ByteString	The key no proof binds under the selected root.
NoLocalTrie	No local trie is held for the registry.

Instances

Instances details

Show Missing Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods showsPrec :: Int -> Missing -> ShowS Source # show :: Missing -> String Source # showList :: [Missing] -> ShowS Source #
Eq Missing Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods (==) :: Missing -> Missing -> Bool Source # (/=) :: Missing -> Missing -> Bool Source #

failureRegistry :: TrieFailure -> RegistryIdentity Source #

The registry a refusal is about.

failureTransaction :: TrieFailure -> Maybe TxId Source #

The transaction a refusal is about, where one is known.

trieFailureName :: TrieFailure -> Text Source #

The refusal's name, as a command prints it.

trieFailureFields :: TrieFailure -> [(Text, Value)] Source #

The receipt field a command prints beside the refusal's name: one trieRefusal object holding the registry, the transaction where one is known, and the cause. Held under one key, it never overwrites a field the command's receipt already carries.

data CompleteFromCreate Source #

Instances

Instances details

Show CompleteFromCreate Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods showsPrec :: Int -> CompleteFromCreate -> ShowS Source # show :: CompleteFromCreate -> String Source # showList :: [CompleteFromCreate] -> ShowS Source #
Eq CompleteFromCreate Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods (==) :: CompleteFromCreate -> CompleteFromCreate -> Bool Source # (/=) :: CompleteFromCreate -> CompleteFromCreate -> Bool Source #

coverageTransitions :: CompleteFromCreate -> Int Source #

data MembershipProof Source #

Instances

Instances details

Show MembershipProof Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods showsPrec :: Int -> MembershipProof -> ShowS Source # show :: MembershipProof -> String Source # showList :: [MembershipProof] -> ShowS Source #
Eq MembershipProof Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods (==) :: MembershipProof -> MembershipProof -> Bool Source # (/=) :: MembershipProof -> MembershipProof -> Bool Source #

membershipBytes :: MembershipProof -> ByteString Source #

data NonMembershipProof Source #

verifyNonMembership :: NonMembershipProof -> Root -> ByteString -> Bool Source #

The proof's key is the one the backend actually queried. Its constructor is private; changing either the requested key or selected root fails.

data PublicLineage Source #

A replayed registry's public lineage: the transaction that minted its state token, every fold from create to the selection in chain order, and the distinct keys the applied updates named, ascending.

Constructors

PublicLineage
Fields lineageCreate :: TxId lineageFolds :: [TxId] lineageKeys :: [ByteString]

Instances

Instances details

Show PublicLineage Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods showsPrec :: Int -> PublicLineage -> ShowS Source # show :: PublicLineage -> String Source # showList :: [PublicLineage] -> ShowS Source #
Eq PublicLineage Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods (==) :: PublicLineage -> PublicLineage -> Bool Source # (/=) :: PublicLineage -> PublicLineage -> Bool Source #

data SpeculativeWalk Source #

Instances

Instances details

Show SpeculativeWalk Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods showsPrec :: Int -> SpeculativeWalk -> ShowS Source # show :: SpeculativeWalk -> String Source # showList :: [SpeculativeWalk] -> ShowS Source #
Eq SpeculativeWalk Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods (==) :: SpeculativeWalk -> SpeculativeWalk -> Bool Source # (/=) :: SpeculativeWalk -> SpeculativeWalk -> Bool Source #

walkRoot :: SpeculativeWalk -> Root Source #

walkProofs :: SpeculativeWalk -> [[ProofStep]] Source #

data CreateRecord Source #

Constructors

CreateRecord RegistryIdentity TxIn

Instances

Instances details

Show CreateRecord Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods showsPrec :: Int -> CreateRecord -> ShowS Source # show :: CreateRecord -> String Source # showList :: [CreateRecord] -> ShowS Source #
Eq CreateRecord Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods (==) :: CreateRecord -> CreateRecord -> Bool Source # (/=) :: CreateRecord -> CreateRecord -> Bool Source #

data ObservedFold Source #

Constructors

ObservedFold TrieSelection TrieSelection (NonEmpty (ByteString, Integer))

Instances

Instances details

Show ObservedFold Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods showsPrec :: Int -> ObservedFold -> ShowS Source # show :: ObservedFold -> String Source # showList :: [ObservedFold] -> ShowS Source #
Eq ObservedFold Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods (==) :: ObservedFold -> ObservedFold -> Bool Source # (/=) :: ObservedFold -> ObservedFold -> Bool Source #

data TrieObservation Source #

Completed operations, emitted by the same engine that returned their values or persisted their accepted nodes.

Constructors

Created TrieSelection
Selected TrieSelection
LeafRead TrieSelection ByteString Leaf
MemberProved TrieSelection ByteString Leaf ByteString
AbsenceProved TrieSelection ByteString
Speculated TrieSelection SpeculativeWalk
FoldAccepted TrieSelection TrieSelection

Instances

Instances details

Show TrieObservation Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods showsPrec :: Int -> TrieObservation -> ShowS Source # show :: TrieObservation -> String Source # showList :: [TrieObservation] -> ShowS Source #
Eq TrieObservation Source #
Instance details Defined in Singular.Registry.TrieState.Types Methods (==) :: TrieObservation -> TrieObservation -> Bool Source # (/=) :: TrieObservation -> TrieObservation -> Bool Source #