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type. Since a endless method is started with `=`, there was ambiguity here. We have to simply reject these in all cases.
This adds a new error for the following reason:
* `def foo arg = nil` is interpreted as a normal method call with optional `arg` without matching `end`
* `def foo *arg = nil; end` is interpreted as a endless method call that has body `nil` with extraneous `end`
`def foo *arg = nil` is somewhere inbetween and I don't know how to otherwise indicate the error.
Now the second case above also shows the newly added error message.
Fixes [Bug #21623]
https://github.com/ruby/prism/commit/e1910d4492
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