implement `@expect` builtin (#19658)

* implement `@expect`

* add docs

* add a second arg for expected bool

* fix typo

* move `expect` to use BinOp

* update to newer langref format
a7de02e052David Rubin committed on 5/22/2024, 3:51:16 PM· committed by GitHubparented75f62
25 files changedLine totals unavailable