sorbet: Fix the formula test helper block typing

[issyl0]

---

• Have you followed our Contributing guidelines?
• Have you checked for other open Pull Requests for the same change?
• Have you explained what your changes do? Performance claims (e.g. "this is faster") must include Hyperfine benchmarks.
• Have you explained why you'd like these changes included, not just what they do?
• For bug fixes, have you given step-by-step brew commands to reproduce the bug?
• Have you written new tests (excluding integration tests)? Here's an example.
• Have you successfully run brew lgtm (style, typechecking and tests) locally?

---

• I did not use AI/LLM to create this PR, or I disclosed the tool/model below and reviewed its output; I did not attribute commits to AI and will answer maintainer questions and review comments myself without AI/LLM.

---

• This formula helper returning Class.new(::Formula, &block) is not of instance type Formula (set in 540457b), but T.class_of(Formula).

• But the accurate T.proc.bind(T.class_of(::Formula)) can't be used instead because Sorbet errors with: "Malformed bind: Can only bind to simple class names". See sorbet: Type blocks at source more precisely than T.untyped #23318 (comment).

• Uses of this test helper that need to be typechecked still need T.bind(self, T.class_of(Formula)) inline until Sorbet can bind to T.class_of of a class with a fixed type_template (maybe never).

[Copilot]

Pull request overview

This PR adjusts Sorbet typing in the RSpec formula test helper to avoid incorrectly typing the helper’s Class.new(::Formula, &block) block as being bound to a Formula instance, which doesn’t match how Ruby evaluates that block (it’s evaluated in the class body context).

Changes:

• Update the formula helper block type from T.proc.bind(::Formula).void to an unbound T.proc.void to avoid incorrect instance binding.

Show a summary per file

File	Description
Library/Homebrew/test/support/helper/formula.rb	Fixes the Sorbet signature for the formula helper’s block to avoid an incorrect bind(::Formula) typing.

Review details

Tip

Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Lite

[p-linnane]

Thanks!