SOURCE_FILE@0..19
  IMPL_DEF@0..18
    UNSAFE_KW@0..6 "unsafe"
    WHITESPACE@6..7 " "
    IMPL_KW@7..11 "impl"
    WHITESPACE@11..12 " "
    PATH_TYPE@12..15
      PATH@12..15
        PATH_SEGMENT@12..15
          NAME_REF@12..15
            IDENT@12..15 "Foo"
    WHITESPACE@15..16 " "
    ASSOC_ITEM_LIST@16..18
      L_CURLY@16..17 "{"
      R_CURLY@17..18 "}"
  WHITESPACE@18..19 "\n"