From 4a375f3ef518797bc8788abf0891655d79aa719c Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 18 Oct 2017 13:08:53 +0000
Subject: parse.y: serial comparisons

* parse.y (rel_expr): warn sequence of comparisons, which would be
  probably unintentional.  [EXPERIMENTAL]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60207 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 test/ruby/test_parse.rb | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'test/ruby')

diff --git a/test/ruby/test_parse.rb b/test/ruby/test_parse.rb
index 769500a261..b9fa57f2c7 100644
--- a/test/ruby/test_parse.rb
+++ b/test/ruby/test_parse.rb
@@ -1069,6 +1069,14 @@ x = __ENCODING__
     assert_equal(1.3, o.x)
   end
 
+  def test_serial_comparison
+    assert_warning(/comparison '<' after/) do
+      $VERBOSE = true
+      x = 1
+      eval("if false; 0 < x < 2; end")
+    end
+  end
+
 =begin
   def test_past_scope_variable
     assert_warning(/past scope/) {catch {|tag| eval("BEGIN{throw tag}; tap {a = 1}; a")}}
-- 
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