tree 9b347bd4c1fedc9483e0587ab69a44c04f8050f1
parent 981680b3e495fe01e4af9644a9f2657cf4237d5a
author Alan Donovan <adonovan@google.com> 1710180515 -0400
committer GitHub <noreply@github.com> 1710180515 -0400
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starlark: new API for go1.23 push iterators (#527)

This change defines two helpers, Elements(seq)
and Entries(mapping), that adapt the Iterable and
IterableMapping interfaces to one- and two-variable
go1.23 range loops. The new syntax is more concise
and frees the caller from worrying about Iterator.Done.

We do not yet update any calls to use them, so that
the project can continue to be build with pre-go1.23
releases of Go.

Also, define Elements methods on {*List,Tuple,*Set}
and an Entries method on *Dict. These optimized iterators
(which can fetch both k and v in one go) will be
used by the Elements and Entries standalone functions
when the operand supports it. (User-defined types
can implement these methods too, although the
interface isn't currently documented.)

Also, a go1.23-only test of the new iteration.