Preparation for removing the existing non-standard iterators
(is, underIs). Note that we cannot use typeset iterators in
range-over-func because the bootstrap compiler doesn't have
access to it yet.
While at it, move underIs from expr.go to under.go
and adjust some doc strings in typset.go to match
prevailing style in that file.
Change-Id: Iecd014eeb5b3fca56a807381c148c5f7a29bfb78
Reviewed-on: https://go-review.googlesource.com/c/go/+/614239 Reviewed-by: Tim King <taking@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Robert Griesemer <gri@google.com>
Commit-Queue: Robert Griesemer <gri@google.com>