First batch of ruby 4.0 backports#3973
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Earlopain merged 4 commits intoruby:ruby-4.0from Mar 7, 2026
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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]
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]
It gets confused for syntax introduced in https://bugs.ruby-lang.org/issues/20925 But it actually should be a plain method call. `!`/`?` are not valid as part of an identifier, methods however allow them as the last character. Fixes [Bug #21946]
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From ruby/ruby#16323