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-rw-r--r--ext/pty/lib/expect.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/pty/lib/expect.rb b/ext/pty/lib/expect.rb
index c3f3925be7..122562127d 100644
--- a/ext/pty/lib/expect.rb
+++ b/ext/pty/lib/expect.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
$expect_verbose = false
# Expect library adds the IO instance method #expect, which does similar act to