Enum mz_transform::attribute::EnvTask
source · enum EnvTask {
Bind(Vec<LocalId>, BTreeSet<LocalId>),
Unbind(BTreeSet<LocalId>),
Done,
}
Expand description
Models an environment maintenance task that needs to be executed after
visiting a MirRelationExpr
. Each task is a state of a finite state
machine.
The Env::schedule_tasks
hook installs exactly one such task for each
subexpression, and the Env::handle_tasks
hook removes it.
In addition, the Env::handle_tasks
looks at the task installed by the
parent expression and modifies it if needed, advancing it through the
following states from left to right:
Bind([...,x], {...}) --> Bind([...], {...,x}) --> Unbind({...}) --> Done
Variants§
Bind(Vec<LocalId>, BTreeSet<LocalId>)
Extend the environment by binding the last derived attribute under the key given the tail of the lhs Vec and move that key from the lhs Vec to the rhs BTreeSet.
Unbind(BTreeSet<LocalId>)
Remove all LocalId entries in the given set from the environment.
Done
Do not do anything.
Implementations§
Trait Implementations§
source§impl PartialEq for EnvTask
impl PartialEq for EnvTask
impl Eq for EnvTask
impl StructuralEq for EnvTask
impl StructuralPartialEq for EnvTask
Auto Trait Implementations§
impl RefUnwindSafe for EnvTask
impl Send for EnvTask
impl Sync for EnvTask
impl Unpin for EnvTask
impl UnwindSafe for EnvTask
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