/plusAssignPrecedence.kt:96:19: error: unresolved reference. None of the following candidates is applicable because of receiver type mismatch: 
public operator fun String?.plus(other: Any?): String defined in kotlin
    task.valInput += "K"
                  ^^
/plusAssignPrecedence.kt:97:19: error: unresolved reference. None of the following candidates is applicable because of receiver type mismatch: 
public operator fun String?.plus(other: Any?): String defined in kotlin
    task.varInput += "K"
                  ^^
/plusAssignPrecedence.kt:99:5: error: val cannot be reassigned
    task.valInputWithPlus += "K"
    ^^^^^^^^^^^^^^^^^^^^^
/plusAssignPrecedence.kt:101:40: error: assignment operators ambiguity: 
public final operator fun plus(v: String): StringPropertyWithPlusAndPlusAssign defined in StringPropertyWithPlusAndPlusAssign
public final operator fun plusAssign(v: String): Unit defined in StringPropertyWithPlusAndPlusAssign
    task.varInputWithPlusAndPlusAssign += "K"
                                       ^^

