SOURCE_FILE
  FN
    FN_KW "fn"
    WHITESPACE " "
    NAME
      IDENT "foo"
    PARAM_LIST
      L_PAREN "("
      R_PAREN ")"
    WHITESPACE " "
    BLOCK_EXPR
      STMT_LIST
        L_CURLY "{"
        WHITESPACE "\n   "
        FOR_EXPR
          FOR_KW "for"
          WHITESPACE " "
          IDENT_PAT
            NAME
              IDENT "x"
          WHITESPACE " "
          IN_KW "in"
          WHITESPACE " "
          RANGE_EXPR
            LITERAL
              INT_NUMBER "0"
            WHITESPACE " "
            DOT2 ".."
          WHITESPACE " "
          BLOCK_EXPR
            STMT_LIST
              L_CURLY "{"
              WHITESPACE "\n       "
              EXPR_STMT
                BREAK_EXPR
                  BREAK_KW "break"
                SEMICOLON ";"
              WHITESPACE "\n   "
              R_CURLY "}"
        WHITESPACE "\n"
        R_CURLY "}"
  WHITESPACE "\n"
