test/passes/remove-unused-names_vacuum.wast

(module
  (func $return-i32-but-body-is-unreachable3 (result i32)
    (local $label i32)
    (block ;; without a name here, vaccum had a too-eager bug
      (loop $while-in$1
        (br $while-in$1)
      )
    )
  )
)