https://git.ruby-lang.org/ruby.git/commit/?id=a58f9aa350

From a58f9aa3504f4057950fb858ea54b28d954f947f Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 23 Mar 2021 16:44:55 +0900
Subject: Assertion for colon-separated encoding pragma

---
 test/ruby/test_parse.rb | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/test/ruby/test_parse.rb b/test/ruby/test_parse.rb
index 4b7a12c..3f2deab 100644
--- a/test/ruby/test_parse.rb
+++ b/test/ruby/test_parse.rb
@@ -669,6 +669,15 @@ FOO https://github.com/ruby/ruby/blob/trunk/test/ruby/test_parse.rb#L669
 
   def test_magic_comment
     x = nil
+
+    assert_nothing_raised do
+      eval <<-END, nil, __FILE__, __LINE__+1
+# coding: utf-8
+x = __ENCODING__
+      END
+    end
+    assert_equal(Encoding.find("UTF-8"), x)
+
     assert_nothing_raised do
       eval <<-END, nil, __FILE__, __LINE__+1
 # coding = utf-8
-- 
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