お世話になります
下記の分がエラーになってしまいます。```ここに言語を入力
REPL
1C:\Users\mtg-1>kotlinc 2Welcome to Kotlin version 1.2.51 (JRE 10.0.1+10) 3Type :help for help, :quit for quit 4>>> operator fun plus(that: Rational): Rational = 5operator fun plus(that: Rational)... Rational( 6... numerator * that.denominator + that.numerator * denominator, 7... denominator * that.denominator 8... ) 9 )error: unresolved reference: Rational 10operator fun plus(that: Rational): Rational = 11 ^ 12error: unresolved reference: Rational 13operator fun plus(that: Rational): Rational = 14 ^ 15error: unresolved reference: Rational 16 Rational( 17 ^ 18error: unresolved reference: numerator 19 numerator * that.denominator + that.numerator * denominator, 20 ^ 21error: unresolved reference: denominator 22 numerator * that.denominator + that.numerator * denominator, 23 ^ 24error: unresolved reference: denominator 25 denominator * that.denominator 26
どこが間違っているのでしょうか?
ご指導ください
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