[ruby/pp] Fix pretty printing range begin/end with false or nil

ruby/pp@6d9c0f255a

Author: tompng

lib/pp.rb

@@ -488,11 +488,12 @@ def pretty_print_cycle(q) # :nodoc:
 
 class Range # :nodoc:
   def pretty_print(q) # :nodoc:
-    q.pp self.begin if self.begin
+    both_nil = self.begin == nil && self.end == nil
+    q.pp self.begin if self.begin != nil || both_nil
     q.breakable ''
     q.text(self.exclude_end? ? '...' : '..')
     q.breakable ''
-    q.pp self.end if self.end
+    q.pp self.end if self.end != nil || both_nil
   end
 end
 

test/test_pp.rb

@@ -34,6 +34,10 @@ def test_range
     assert_equal("0...1\n", PP.pp(0...1, "".dup))
     assert_equal("0...\n", PP.pp(0..., "".dup))
     assert_equal("...1\n", PP.pp(...1, "".dup))
+    assert_equal("..false\n", PP.pp(..false, "".dup))
+    assert_equal("false..\n", PP.pp(false.., "".dup))
+    assert_equal("false..false\n", PP.pp(false..false, "".dup))
+    assert_equal("nil..nil\n", PP.pp(nil..nil, "".dup))
   end
 end