Fix wrong "void value expression" error

* parse.y (value_expr_check): if either of `then` or `else`
  statements is not a void value expression, the whole `if` is not
  also a void value expression.  [Bug #15932]

1 files changed, 6 insertions, 0 deletions

diff --git a/test/ruby/test_syntax.rb b/test/ruby/test_syntax.rb
index 4e8ffe56fb..541170ff8f 100644
--- a/test/ruby/test_syntax.rb
+++ b/test/ruby/test_syntax.rb
@@ -1388,6 +1388,12 @@ eom
     assert_syntax_error('a|>-b', /unexpected '-'/)
   end
 
+  def test_value_expr_in_condition
+    mesg = /void value expression/
+    assert_syntax_error("tap {a = (true ? next : break)}", mesg)
+    assert_valid_syntax("tap {a = (true ? true : break)}")
+  end
+
   private
 
   def not_label(x) @result = x; @not_label ||= nil end