Merge pull request #29057 from koic/suppress_warning_assigned_but_unused_variable

Suppress `warning: assigned but unused variable - stdout`

actioncable/Rakefile

@@ -65,7 +65,7 @@ namespace :assets do
     end
 
     print "[verify] #{dir} can be required as a module "
-    stdout, stderr, status = Open3.capture3("node", "--print", "window = {}; require('#{dir}');")
+    _, stderr, status = Open3.capture3("node", "--print", "window = {}; require('#{dir}');")
     if status.success?
       puts "[OK]"
     else

actionview/Rakefile

@@ -119,7 +119,7 @@ namespace :assets do
       class Element {}
       require('#{dir}')
     JS
-    stdout, stderr, status = Open3.capture3("node", "--print", js)
+    _, stderr, status = Open3.capture3("node", "--print", js)
     if status.success?
       puts "[OK]"
     else