[
  [
    "warning",
    "the type of the loop variable 'foo' is different from the one returned by the iterator and generates an implicit conversion; you can either change the type to the matching one ('const SimpleClass &' but 'const auto&' is always a valid option) or remove the reference to make it explicit that you are creating a new value",
    "performance-implicit-conversion-in-loop"
  ],
  { "reliability": "high" }
]