Bug #20764: Forwarding parameter `...` is wrongly allowed in lambda

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 3.4.0dev (2024-09-27T00:58:32Z master 0c25eb4ffe) +PRISM [x86_64-linux]
• Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN

[tompng (tomoya ishida)]

These codes are all syntax error

->...{}
->(...){}
->(a,...){}

But these are allowed in --parser=parse.y. It should be syntax error

->a,...{}
->(a=1,...){}

# ruby --parser=parse.y -e "p ->a,...{}.parameters"
[[:opt, :b], [:rest, :*], [:keyrest, :**], [:block, :&]]

# ruby --parser=parse.y -e "p ->(a=1,...){}.parameters"
[[:opt, :b], [:rest, :*], [:keyrest, :**], [:block, :&]]

# ruby --parser=parse.y -e "p ->(a,...){}.parameters"
-e:1: syntax error, unexpected ...
p ->(a,...){}.parameters
ruby: compile error (SyntaxError)

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed

Applied in changeset commit:git|86ae409467e3674c142f012ee3b2288b0305d87c.

---

[Bug #20764] Refactor argument forwarding in lambda

Reject argument forwarding in lambda:

• without parentheses
• after optional argument(s)