3.4 backports#4135
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They currently complain that the parent method is not forwarding. But the actual problem is that these types of arguments simply don't accept `...` Fixes [Bug #21927]
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]
Denominators can contain underscores in fraction part as well as other numeric literals. [Bug #21831]: https://bugs.ruby-lang.org/issues/21831
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kddnewton
approved these changes
Jun 15, 2026
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From ruby/ruby#16324