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String#delete_prefix is documented for 2.4.1, but does not exist until 2.5.0dev. #80
Description
String#delete_prefix and String#delete_prefix! appear in the documentation for Ruby 2.4.1, but when I try to use them I get the following error:
"hello".delete_prefix("hel")
NoMethodError: undefined method `delete_prefix' for "hello":String
from (irb):1
from /Users/alex/.rbenv/versions/2.4.1/bin/irb:11:in `<main>'These work properly in 2.5.0dev:
"hello".delete_prefix("hel")
=> "lo"
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