SOURCE_FILE@0..30
  FN@0..29
    UNSAFE_KW@0..6 "unsafe"
    WHITESPACE@6..7 " "
    ABI@7..17
      EXTERN_KW@7..13 "extern"
      WHITESPACE@13..14 " "
      STRING@14..17 "\"C\""
    WHITESPACE@17..18 " "
    FN_KW@18..20 "fn"
    WHITESPACE@20..21 " "
    NAME@21..24
      IDENT@21..24 "foo"
    PARAM_LIST@24..26
      L_PAREN@24..25 "("
      R_PAREN@25..26 ")"
    WHITESPACE@26..27 " "
    BLOCK_EXPR@27..29
      L_CURLY@27..28 "{"
      R_CURLY@28..29 "}"
  WHITESPACE@29..30 "\n"