SOURCE_FILE
  STRUCT
    STRUCT_KW "struct"
    WHITESPACE " "
    NAME
      IDENT "S"
    TUPLE_FIELD_LIST
      L_PAREN "("
      TUPLE_FIELD
        PATH_TYPE
          PATH
            PATH_SEGMENT
              NAME_REF
                IDENT "i32"
      COMMA ","
      WHITESPACE " "
      TUPLE_FIELD
        PATH_TYPE
          PATH
            PATH_SEGMENT
              NAME_REF
                IDENT "i32"
      R_PAREN ")"
    SEMICOLON ";"
  WHITESPACE "\n"
  FN
    FN_KW "fn"
    WHITESPACE " "
    NAME
      IDENT "f"
    PARAM_LIST
      L_PAREN "("
      R_PAREN ")"
    WHITESPACE " "
    BLOCK_EXPR
      STMT_LIST
        L_CURLY "{"
        WHITESPACE "\n    "
        LET_STMT
          LET_KW "let"
          WHITESPACE " "
          IDENT_PAT
            NAME
              IDENT "s"
          WHITESPACE " "
          EQ "="
          WHITESPACE " "
          CALL_EXPR
            PATH_EXPR
              PATH
                PATH_SEGMENT
                  NAME_REF
                    IDENT "S"
            ARG_LIST
              L_PAREN "("
              LITERAL
                INT_NUMBER "1"
              COMMA ","
              WHITESPACE " "
              LITERAL
                INT_NUMBER "2"
              R_PAREN ")"
          SEMICOLON ";"
        WHITESPACE "\n    "
        LET_STMT
          LET_KW "let"
          WHITESPACE " "
          IDENT_PAT
            NAME
              IDENT "a"
          WHITESPACE " "
          EQ "="
          WHITESPACE " "
          FIELD_EXPR
            FIELD_EXPR
              PATH_EXPR
                PATH
                  PATH_SEGMENT
                    NAME_REF
                      IDENT "s"
              DOT "."
              ERROR
                FLOAT_NUMBER "1e0"
          SEMICOLON ";"
        WHITESPACE "\n"
        R_CURLY "}"
  WHITESPACE "\n"
error 42: illegal float literal
