Explicitly unpack the expanded args to avoid execution order diff.
In https://bugs.ruby-lang.org/issues/12860 I argue that MRI's execution order here is incorrect. The splatting of the 'c' args should happen before the shift, but it happens after. On JRuby, it behaves the way you would expect, leading to the 'c' args splat still containing the block and producing an error like "cannot convert proc to symbol" when the send attempts to coerce it. This patch makes the unpacking order explicit with a multi-assign, which behaves properly on all implementations I tested.
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