pub struct EventPattern {
pub fields: Vec<EventPatternField>,
pub rest_span: Span,
pub span: Span,
}Expand description
The structural filter on a from Events(E { field: value, .. })
subscription header (Events track, slice 1, spine #936) — deliver-and-filter:
every emission still reaches the fan-out mechanism, and the subscriber’s
own generated handler evaluates this as a boolean guard before running the
body. Deliberately not a Pattern — an event is a plain record, not
a sum, so it has no tag for Pattern::Variant to test; extending the
shared Pattern enum to fit would touch parser/checker/emitter/fmt/
tree-sitter/LSP sites and drag in match-exhaustiveness semantics a
delivery filter does not need. This amends
ADR 0286’s
“no bespoke matching engine is introduced for Events” claim; its
deliver-and-filter decision is unchanged. No static narrowing: a matching
handler body still sees its parameter at its own declared type, never
narrowed to a listed field’s specific value (deferred — narrowing needs a
singleton-variant type the checker does not have, and waits on the
refinement-propagation design question design/bynk-type-system.md
§2.5.4 names as still open).
Fields§
§fields: Vec<EventPatternField>The listed fields, in source order. Never empty — a pattern with no
fields has no shape (from Events(E), no braces, is the pattern-less
form; from Events(E { }) is a parse error pointing at it).
rest_span: SpanThe span of the required trailing .. — every listed field leaves
the rest of the record’s fields unconstrained, and that must be
written explicitly rather than implied.
span: SpanImplementations§
Trait Implementations§
Source§impl Clone for EventPattern
impl Clone for EventPattern
Source§fn clone(&self) -> EventPattern
fn clone(&self) -> EventPattern
1.0.0 · Source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source. Read moreAuto Trait Implementations§
impl Freeze for EventPattern
impl RefUnwindSafe for EventPattern
impl Send for EventPattern
impl Sync for EventPattern
impl Unpin for EventPattern
impl UnsafeUnpin for EventPattern
impl UnwindSafe for EventPattern
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