更新到1.4.0-rc后使用stream.map时“没有足够的信息来推断类型变量R”

问题描述

我有此代码段，可与Kotlin 1.3.72一起很好地工作：

import javax.persistence.EntityManager

val query = entityManager.createquery(...)
val myEnumToDate: MutableMap<EventTypeEnum,Date> = mutableMapOf()
query.resultStream
    .map { it as Array<*> } // line 10
    .map { Pair(it[0] as MyEnum,it[1] as Date) } // line 11
    .forEachOrdered { (myEnum,date) -> // line 12
        myEnumToDate.putIfAbsent(MyEnum,date) // line13 
    }
return myEnumToDate

更新到Kotlin 1.4.0-rc后，出现以下编译错误，当使用Gradle进行编译时，IntelliJ还会在IDE中显示错误。

line 10: Not enough @R_125_4045@ion to infer type variable R

line 11: Not enough @R_125_4045@ion to infer type variable R
line 11: Unresolved reference. None of the following candidates is applicable because of receiver type mismatch:
    public operator fun MatchGroupCollection.get(name: String): MatchGroup? defined in kotlin.text
line 11: No get method providing array access
line 11: Unresolved reference. None of the following candidates is applicable because of receiver type mismatch: 
    public operator fun MatchGroupCollection.get(name: String): MatchGroup? defined in kotlin.text
line 11: No get method providing array access

line 12: Destructuring declaration initializer of type Any! must have a 'component1()' function
line 12: Destructuring declaration initializer of type Any! must have a 'component2()' function

如何通过声明显式类型来解决它？我认为这应该被报告为Kotlin类型干扰中的错误，对吧？

解决方法

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kotlin kotlin type-inference