pub const PIPELINE_RECEIVERS: &[CollectionCtor];Expand description
The collection constructors a TypePattern::Iterable receiver accepts
(ADR-127 decision 1) — the for loop’s list minus Grid and Seq.
Grid[T] is excluded, and grid.map is why. §6.4 requires grid.map(fn)
and it means the shape-preserving one, Grid[T] -> Grid[U], cells in place. A
generic row would claim the name and answer Vec[U] instead. A grid enters a
pipeline through grid.cells() or grid.positions(), which already answer
Vecs. The exclusion is enforced rather than intended:
MethodCatalogBuilder::finish
refuses a concrete row that shares a (name, arity) with a generic one on a
receiver in this list, so a future Grid[T].map/1 is allowed and a
Set[T].map/1 is a build failure.
Seq[T] is excluded because it has no values. praxis-repr says a Seq
has no runtime representation, and nothing produces or consumes one
(ADR-127).
Text is the tenth receiver and is not here, because it is not a collection:
it is the one scalar with members (§4.13). is_pipeline_receiver is the
predicate that answers for all ten.