Bug #21674: Possible regression in return case in statement

• Status: Closed
• Assignee: prism
• Target version: -
• ruby -v: 3.4.6
• Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN

[jandudulski (Jan Dudulski)]

Suddenly my code started failing in Ruby 3.4.6 and 3.4.7. Shortest code example:

args = [:increased]
context = Data.define(:event).new(:decreased)
case args
in [event]
  context.event in ^event
end

In Ruby prior to 3.4.6 it returns false (as expected) but in 3.4.6 and 3.4.7 it returns :decreased. context.event in ^event still returns false.

[jandudulski (Jan Dudulski)]

• Description updated (diff)

Typo

[kddnewton (Kevin Newton)]

• Assignee set to prism

[Earlopain (Earlopain _)]

Bisected to https://github.com/ruby/prism/pull/3560/commits/915f6b3ae90aae73bb438e51fb9baa8b6ec0c489

[kddnewton (Kevin Newton)]

• Status changed from Open to Closed

Applied in changeset git|c7ed328cd569a258aa949f78f721195e2be15e9e.

---

[ruby/prism] Fix in handling

in is a unique keyword because it can be the start of a clause or
an infix keyword. We need to be explicitly sure that even though in
could close an expression context (the body of another in clause)
that we are not also parsing an inline in. The exception is the
case of a command call, which can never be the LHS of an expression,
and so we must immediately exit.

[Bug #21925]
[Bug #21674]

https://github.com/ruby/prism/commit/20374ced51