merge revision(s) 6e6844320de989cb88a154e2ac75066ccea1bba2: [Backport #16619]

	Fixed duplicated warning

	As `command_rhs` is always a "value expression", `command_asgn`
	does not need the same check.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@67839 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 6 insertions, 0 deletions

diff --git a/test/ruby/test_parse.rb b/test/ruby/test_parse.rb
index c7aeeecb61..24ca62a3f6 100644
--- a/test/ruby/test_parse.rb
+++ b/test/ruby/test_parse.rb
@@ -1198,6 +1198,12 @@ x = __ENCODING__
     assert_valid_syntax('let () { m(a) do; end }')
   end
 
+  def test_void_value_in_command_rhs
+    w = "void value expression"
+    ex = assert_syntax_error("x = return 1", w)
+    assert_equal(1, ex.message.scan(w).size, "same #{w.inspect} warning should be just once")
+  end
+
 =begin
   def test_past_scope_variable
     assert_warning(/past scope/) {catch {|tag| eval("BEGIN{throw tag}; tap {a = 1}; a")}}