Warn when passing a non-literal block to Kernel#lambda

Implements [Feature #15973]

1 files changed, 6 insertions, 0 deletions

diff --git a/test/ruby/test_lambda.rb b/test/ruby/test_lambda.rb
index 03b501a6c9..75362e2796 100644
--- a/test/ruby/test_lambda.rb
+++ b/test/ruby/test_lambda.rb
@@ -74,6 +74,12 @@ class TestLambdaParameters < Test::Unit::TestCase
     assert_raise(ArgumentError, bug9605) {proc(&plus).call [1,2]}
   end
 
+  def test_warning_for_non_literal_blocks
+    assert_warn(/lambda without a literal block/, '[ruby-core:93482] [Feature #15973]') do
+      lambda(&:symbol)
+    end
+  end
+
   def pass_along(&block)
     lambda(&block)
   end