From: "usa (Usaku NAKAMURA) via ruby-core" <ruby-core@...>
Date: 2023-11-06T11:14:53+00:00
Subject: [ruby-core:115262] [Ruby master Bug#18991] False LocalJumpError when branch coverage is enabled

Issue #18991 has been updated by usa (Usaku NAKAMURA).

Backport changed from 3.0: UNKNOWN, 3.1: REQUIRED, 3.2: DONTNEED to 3.0: UNKNOWN, 3.1: DONE, 3.2: DONTNEED

ruby_3_1 d494cf4ddababb80660381e963f910ccacc3f7bc merged revision(s) 4a7d6c2852aa734506be83c932168e8f974687b5.

----------------------------------------
Bug #18991: False LocalJumpError when branch coverage is enabled
https://bugs.ruby-lang.org/issues/18991#change-105178

* Author: qnighy (Masaki Hara)
* Status: Closed
* Priority: Normal
* Assignee: mame (Yusuke Endoh)
* ruby -v: ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [arm64-darwin21]
* Backport: 3.0: UNKNOWN, 3.1: DONE, 3.2: DONTNEED
----------------------------------------
Enabling branch coverage leads to a false LocalJumpError where it should not be raised.

```ruby
# test.rb
require "coverage"
Coverage.start(branches: true)
# Coverage.start(lines: true)

load "./test2.rb"
```

```ruby
# test2.rb
1&.tap do break end
```

Output:

```
$ ruby test.rb
/Users/qnighy/workdir/branch-coverage-bug/test2.rb:1:in `block in <top (required)>': break from proc-closure (LocalJumpError)
	from <internal:kernel>:90:in `tap'
	from /Users/qnighy/workdir/branch-coverage-bug/test2.rb:1:in `<top (required)>'
	from test.rb:5:in `load'
	from test.rb:5:in `<main>'
```



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