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    "
        EXPR_STMT
          CALL_EXPR
            ATTR
              POUND "#"
              L_BRACK "["
              META
                PATH
                  PATH_SEGMENT
                    NAME_REF
                      IDENT "A"
              R_BRACK "]"
            WHITESPACE " "
            PATH_EXPR
              PATH
                PATH_SEGMENT
                  NAME_REF
                    IDENT "foo"
            ARG_LIST
              L_PAREN "("
              R_PAREN ")"
          SEMICOLON ";"
        WHITESPACE "\n    "
        EXPR_STMT
          MACRO_EXPR
            ATTR
              POUND "#"
              L_BRACK "["
              META
                PATH
                  PATH_SEGMENT
                    NAME_REF
                      IDENT "B"
              R_BRACK "]"
            WHITESPACE " "
            MACRO_CALL
              PATH
                PATH_SEGMENT
                  NAME_REF
                    IDENT "bar"
              BANG "!"
              TOKEN_TREE
                L_CURLY "{"
                R_CURLY "}"
        WHITESPACE "\n    "
        EXPR_STMT
          BLOCK_EXPR
            ATTR
              POUND "#"
              L_BRACK "["
              META
                PATH
                  PATH_SEGMENT
                    NAME_REF
                      IDENT "C"
              R_BRACK "]"
            WHITESPACE " "
            ATTR
              POUND "#"
              L_BRACK "["
              META
                PATH
                  PATH_SEGMENT
                    NAME_REF
                      IDENT "D"
              R_BRACK "]"
            WHITESPACE " "
            STMT_LIST
              L_CURLY "{"
              R_CURLY "}"
        WHITESPACE "\n    "
        EXPR_STMT
          RETURN_EXPR
            ATTR
              POUND "#"
              L_BRACK "["
              META
                PATH
                  PATH_SEGMENT
                    NAME_REF
                      IDENT "D"
              R_BRACK "]"
            WHITESPACE " "
            RETURN_KW "return"
            WHITESPACE " "
            TUPLE_EXPR
              L_PAREN "("
              R_PAREN ")"
          SEMICOLON ";"
        WHITESPACE "\n"
        R_CURLY "}"
  WHITESPACE "\n"
