SOURCE_FILE@0..27
  IMPL@0..26
    UNSAFE_KW@0..6 "unsafe"
    WHITESPACE@6..7 " "
    DEFAULT_KW@7..14 "default"
    WHITESPACE@14..15 " "
    IMPL_KW@15..19 "impl"
    WHITESPACE@19..20 " "
    PATH_TYPE@20..23
      PATH@20..23
        PATH_SEGMENT@20..23
          NAME_REF@20..23
            IDENT@20..23 "Foo"
    WHITESPACE@23..24 " "
    ASSOC_ITEM_LIST@24..26
      L_CURLY@24..25 "{"
      R_CURLY@25..26 "}"
  WHITESPACE@26..27 "\n"