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Bug #20807
openString#gsub fails when called from string subclass with a block passed
Status:
Open
Assignee:
-
Target version:
-
ruby -v:
ruby 3.3.4 (2024-07-09 revision be1089c8ec) [arm64-darwin23]
Description
When String#gsub
is called from a string subclass with a block, Regexp.last_match
is nil, but passed block is executed. Here is example code:
def call_gsub(str)
str.gsub(/%/) do
puts "checking #{str.class}"
puts "Special variable value: #{$&}"
puts "Regexp.last_match = #{Regexp.last_match.inspect}\n\n"
raise "Special variable $& is not assigned, but block is called" if $&.nil?
end
end
class MyString < String
def gsub(*args, &block)
super(*args, &block) # just forward everything
end
end
text = 'test%text_with_special_character'
call_gsub(String.new(text)) # original string
call_gsub(MyString.new(text)) # string subclass
Result:
checking String
Special variable value: %
Regexp.last_match = #<MatchData "%">
checking MyString
Special variable value:
Regexp.last_match = nil
gsub_bug.rb:7:in `block in call_gsub': Special variable $& is not assigned, but block is called (RuntimeError)
from gsub_bug.rb:13:in `gsub'
from gsub_bug.rb:13:in `gsub'
from gsub_bug.rb:2:in `call_gsub'
from gsub_bug.rb:20:in `<main>'
I expect result to be the same for both classes since MyString
just wraps the same method:
checking String
Special variable value: %
Regexp.last_match = #<MatchData "%">
checking MyString
Special variable value: %
Regexp.last_match = #<MatchData "%">
Maybe there is something off with with control frame when params are forwarded?
Thanks in advance!
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