From 558c10413990cb08b7750895b572b0b59eed0d28 Mon Sep 17 00:00:00 2001
From: Earlopain <14981592+Earlopain@users.noreply.github.com>
Date: Wed, 22 Apr 2026 21:29:13 +0200
Subject: [ruby/prism] Reject `END { break }` for Ruby 4.0

For [Bug #20409]

https://github.com/ruby/prism/commit/4848eb344e
---
 test/prism/errors/4.1/end_block_exit.txt       | 5 +++++
 test/prism/errors_test.rb                      | 9 ++++++++-
 test/prism/fixtures/3.3-4.0/end_block_exit.txt | 7 +++++++
 test/prism/fixtures/end_block_exit.txt         | 3 +++
 4 files changed, 23 insertions(+), 1 deletion(-)
 create mode 100644 test/prism/errors/4.1/end_block_exit.txt
 create mode 100644 test/prism/fixtures/3.3-4.0/end_block_exit.txt
 create mode 100644 test/prism/fixtures/end_block_exit.txt

(limited to 'test')

diff --git a/test/prism/errors/4.1/end_block_exit.txt b/test/prism/errors/4.1/end_block_exit.txt
new file mode 100644
index 0000000000..f8fc59d1a3
--- /dev/null
+++ b/test/prism/errors/4.1/end_block_exit.txt
@@ -0,0 +1,5 @@
+END {
+  break
+  ^~~~~ Invalid break
+}
+
diff --git a/test/prism/errors_test.rb b/test/prism/errors_test.rb
index 9a54203f74..9dd7fbe3fe 100644
--- a/test/prism/errors_test.rb
+++ b/test/prism/errors_test.rb
@@ -9,6 +9,11 @@ module Prism
     base = File.expand_path("errors", __dir__)
     filepaths = Dir[ENV.fetch("FOCUS", "**/*.txt"), base: base]
 
+    PARSE_Y_EXCLUDES = [
+      # https://bugs.ruby-lang.org/issues/20409
+      "#{base}/4.1/end_block_exit.txt"
+    ]
+
     filepaths.each do |filepath|
       ruby_versions_for(filepath).each do |version|
         define_method(:"test_#{version}_#{File.basename(filepath, ".txt")}") do
@@ -111,7 +116,9 @@ module Prism
       expected = File.read(filepath, binmode: true, external_encoding: Encoding::UTF_8)
 
       source = expected.lines.grep_v(/^\s*\^/).join.gsub(/\n*\z/, "")
-      refute_valid_syntax(source) if CURRENT_MAJOR_MINOR == version
+      if CURRENT_MAJOR_MINOR == version && !PARSE_Y_EXCLUDES.include?(filepath)
+        refute_valid_syntax(source)
+      end
 
       result = Prism.parse(source, version: version)
       errors = result.errors
diff --git a/test/prism/fixtures/3.3-4.0/end_block_exit.txt b/test/prism/fixtures/3.3-4.0/end_block_exit.txt
new file mode 100644
index 0000000000..53afa1e2f4
--- /dev/null
+++ b/test/prism/fixtures/3.3-4.0/end_block_exit.txt
@@ -0,0 +1,7 @@
+END {
+  return
+}
+
+END {
+  break
+}
diff --git a/test/prism/fixtures/end_block_exit.txt b/test/prism/fixtures/end_block_exit.txt
new file mode 100644
index 0000000000..1f64dcb6ed
--- /dev/null
+++ b/test/prism/fixtures/end_block_exit.txt
@@ -0,0 +1,3 @@
+END {
+  next
+}
-- 
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