test/passes/vacuum_remove-unused-names_merge-blocks.txt

(module
 (type $0 (func (param i32) (result i32)))
 (func $return-block (param $x i32) (result i32)
  (local.set $x
   (local.get $x)
  )
  (return
   (local.get $x)
  )
 )
)