{
  # unquoted keys
  unquoted_key: test
  _unquoted: test
  test-key: test
  -test: test
  .key: test
  # trailing spaces in key names are ignored
  trailing : test
  trailing2  : test
  # comment char in key name
  "#c1": test
  "foo#bar": test
  "//bar": test
  "foo//bar": test
  "/*foo*/": test
  "foo/*foo*/bar": test
  "/*": test
  "foo/*bar": test
  # quotes in key name
  "\"": test
  "foo\"bar": test
  "'''": test
  "foo'''bar": test
  # control char in key name
  ":": test
  "foo:bar": test
  "{": test
  "foo{bar": test
  "}": test
  "foo}bar": test
  "[": test
  "foo[bar": test
  "]": test
  "foo]bar": test
  # newline
  nl1:
    test
  nl2
    :
    test

  nl3

    :

    test
}