Issue #14846 has been reported by Eregon (Benoit Daloze).

----------------------------------------
Bug #14846: Backport fixes for Kernel#warn(uplevel:)
https://bugs.ruby-lang.org/issues/14846

* Author: Eregon (Benoit Daloze)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-linux]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
~~~ ruby
-> { warn("foo", 100) }.should output(nil, "warning: foo\n")
~~~
It is missing the "warning: " prefix in 2.5.1.

~~~ ruby
-> { warn "", uplevel: -1 }.should raise_error(ArgumentError)
~~~
It doesn't raise in 2.5.1 even though `warn "", uplevel: -2` does.

Both were fixed on trunk.
I believe it should be fixed in 2.5 as that is buggy behavior.

Then https://github.com/ruby/spec/commit/dea70b1c50f2cba7624b764fea639edfcff11ced can be reverted.



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