| Safe Haskell | Safe-Inferred |
|---|---|
| Language | Haskell2010 |
Agda.Syntax.Internal.Blockers
Synopsis
- data NotBlocked' t
- data Blocker
- alwaysUnblock :: Blocker
- neverUnblock :: Blocker
- unblockOnAll :: Set Blocker -> Blocker
- unblockOnAny :: Set Blocker -> Blocker
- unblockOnEither :: Blocker -> Blocker -> Blocker
- unblockOnMeta :: MetaId -> Blocker
- unblockOnProblem :: ProblemId -> Blocker
- unblockOnAllMetas :: Set MetaId -> Blocker
- unblockOnAnyMeta :: Set MetaId -> Blocker
- onBlockingMetasM :: Monad m => (MetaId -> m Blocker) -> Blocker -> m Blocker
- allBlockingMetas :: Blocker -> Set MetaId
- allBlockingProblems :: Blocker -> Set ProblemId
- data Blocked' t a
- = Blocked {
- theBlocker :: Blocker
- ignoreBlocking :: a
- | NotBlocked {
- blockingStatus :: NotBlocked' t
- ignoreBlocking :: a
- = Blocked {
- stuckOn :: Elim' t -> NotBlocked' t -> NotBlocked' t
- blockedOn :: Blocker -> a -> Blocked' t a
- blocked :: MetaId -> a -> Blocked' t a
- notBlocked :: a -> Blocked' t a
- blocked_ :: MetaId -> Blocked' t ()
- notBlocked_ :: Blocked' t ()
- data WakeUp
- = WakeUp
- | DontWakeUp (Maybe Blocker)
- wakeUpWhen :: (constr -> Bool) -> (constr -> WakeUp) -> constr -> WakeUp
- wakeUpWhen_ :: (constr -> Bool) -> constr -> WakeUp
- wakeIfBlockedOnProblem :: ProblemId -> Blocker -> WakeUp
- wakeIfBlockedOnMeta :: MetaId -> Blocker -> WakeUp
- unblockMeta :: MetaId -> Blocker -> Blocker
- unblockProblem :: ProblemId -> Blocker -> Blocker
Blocked Terms
data NotBlocked' t Source #
Even if we are not stuck on a meta during reduction we can fail to reduce a definition by pattern matching for another reason.
Constructors
| StuckOn (Elim' t) | The |
| Underapplied | Not enough arguments were supplied to complete the matching. |
| AbsurdMatch | We matched an absurd clause, results in a neutral |
| MissingClauses | We ran out of clauses, all considered clauses produced an actual mismatch. This can happen when try to reduce a function application but we are still missing some function clauses. See Agda.TypeChecking.Patterns.Match. |
| ReallyNotBlocked | Reduction was not blocked, we reached a whnf
which can be anything but a stuck |
Instances
What is causing the blocking? Or in other words which metas or problems need to be solved to unblock the blocked computation/constraint.
Constructors
| UnblockOnAll (Set Blocker) | |
| UnblockOnAny (Set Blocker) | |
| UnblockOnMeta MetaId | Unblock if meta is instantiated |
| UnblockOnProblem ProblemId |
Instances
unblockOnMeta :: MetaId -> Blocker Source #
unblockOnProblem :: ProblemId -> Blocker Source #
Something where a meta variable may block reduction. Notably a top-level meta is considered blocking. This did not use to be the case (pre Aug 2020).
Constructors
| Blocked | |
Fields
| |
| NotBlocked | |
Fields
| |
Instances
stuckOn :: Elim' t -> NotBlocked' t -> NotBlocked' t Source #
When trying to reduce f es, on match failed on one
elimination e ∈ es that came with info r :: NotBlocked.
stuckOn e r produces the new NotBlocked info.
MissingClauses must be propagated, as this is blockage
that can be lifted in the future (as more clauses are added).
StuckOn e0StuckOn e (as e0 is the original
reason why reduction got stuck and usually a subterm of e).
An information like StuckOn (Apply (Arg info (Var i [])))
(stuck on a variable) could be used by the lhs/coverage checker
to trigger a split on that (pattern) variable.
In the remaining cases for r, we are terminally stuck
due to StuckOn e. Propagating AbsurdMatch
Underapplied must not be propagated, as this would mean
that f es is underapplied, which is not the case (it is stuck).
Note that Underapplied can only arise when projection patterns were
missing to complete the original match (in e).
(Missing ordinary pattern would mean the e is of function type,
but we cannot match against something of function type.)
Handling blocked terms.
notBlocked :: a -> Blocked' t a Source #
notBlocked_ :: Blocked' t () Source #
Waking up logic
Should a constraint wake up or not? If not, we might refine the unblocker.
Constructors
| WakeUp | |
| DontWakeUp (Maybe Blocker) |
Instances
wakeUpWhen_ :: (constr -> Bool) -> constr -> WakeUp Source #