https://git.ruby-lang.org/ruby.git/commit/?id=52369fc545

From 52369fc545c458efb2fa7e8ca183b119252bb4f9 Mon Sep 17 00:00:00 2001
From: Marc-Andre Lafortune <github@m...>
Date: Mon, 14 Jun 2021 10:07:51 -0400
Subject: [lib/ostruct] Allow overriding of `block_given?`

---
 lib/ostruct.rb               | 7 ++++---
 test/ostruct/test_ostruct.rb | 3 +++
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/lib/ostruct.rb b/lib/ostruct.rb
index a4e7b44..eef1d5c 100644
--- a/lib/ostruct.rb
+++ b/lib/ostruct.rb
@@ -197,7 +197,7 @@ class OpenStruct https://github.com/ruby/ruby/blob/trunk/lib/ostruct.rb#L197
   #   data.each_pair.to_a   # => [[:country, "Australia"], [:capital, "Canberra"]]
   #
   def each_pair
-    return to_enum(__method__) { @table.size } unless block_given?
+    return to_enum(__method__) { @table.size } unless block_given!
     @table.each_pair{|p| yield p}
     self
   end
@@ -354,7 +354,7 @@ class OpenStruct https://github.com/ruby/ruby/blob/trunk/lib/ostruct.rb#L354
     rescue NameError
     end
     @table.delete(sym) do
-      return yield if block_given?
+      return yield if block_given!
       raise! NameError.new("no field `#{sym}' in #{self}", sym)
     end
   end
@@ -453,5 +453,6 @@ class OpenStruct https://github.com/ruby/ruby/blob/trunk/lib/ostruct.rb#L453
   end
   # Other builtin private methods we use:
   alias_method :raise!, :raise
-  private :raise!
+  alias_method :block_given!, :block_given?
+  private :raise!, :block_given!
 end
diff --git a/test/ostruct/test_ostruct.rb b/test/ostruct/test_ostruct.rb
index f8d184b..d2aad44 100644
--- a/test/ostruct/test_ostruct.rb
+++ b/test/ostruct/test_ostruct.rb
@@ -110,6 +110,9 @@ class TC_OpenStruct < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ostruct/test_ostruct.rb#L110
     assert_equal(:foobar, o.delete_field(s) { :baz })
 
     assert_equal(42, OpenStruct.new(foo: 42).delete_field(:foo) { :bug })
+
+    o = OpenStruct.new(block_given?: 42)
+    assert_raise(NameError) { o.delete_field(:foo) }
   end
 
   def test_setter
-- 
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