FILE fqName:<root> fileName:/box.kt
  FUN name:box visibility:public modality:FINAL <> () returnType:kotlin.String
    BLOCK_BODY
      RETURN type=kotlin.Nothing from='public final fun box (): kotlin.String declared in <root>'
        CALL 'public final fun foo (filter: kotlin.Function1<kotlin.String, kotlin.Boolean>?): kotlin.String declared in <root>' type=kotlin.String origin=null
          filter: CONST Null type=kotlin.Nothing? value=null
  FUN name:foo visibility:public modality:FINAL <> (filter:kotlin.Function1<kotlin.String, kotlin.Boolean>?) returnType:kotlin.String
    VALUE_PARAMETER name:filter index:0 type:kotlin.Function1<kotlin.String, kotlin.Boolean>?
    BLOCK_BODY
      TYPE_OP type=kotlin.Unit origin=IMPLICIT_COERCION_TO_UNIT typeOperand=kotlin.Unit
        CONSTRUCTOR_CALL 'public constructor <init> (filter: @[FlexibleNullability] <root>.Condition<in @[FlexibleNullability] kotlin.String?>?) declared in <root>.J' type=<root>.J origin=null
          filter: TYPE_OP type=@[FlexibleNullability] <root>.Condition<kotlin.Any?>? origin=SAM_CONVERSION typeOperand=@[FlexibleNullability] <root>.Condition<kotlin.Any?>?
            TYPE_OP type=@[FlexibleNullability] kotlin.Function1<@[ParameterName(name = "t")] kotlin.Any?, kotlin.Boolean>? origin=IMPLICIT_CAST typeOperand=@[FlexibleNullability] kotlin.Function1<@[ParameterName(name = "t")] kotlin.Any?, kotlin.Boolean>?
              GET_VAR 'filter: kotlin.Function1<kotlin.String, kotlin.Boolean>? declared in <root>.foo' type=kotlin.Function1<kotlin.String, kotlin.Boolean>? origin=null
      RETURN type=kotlin.Nothing from='public final fun foo (filter: kotlin.Function1<kotlin.String, kotlin.Boolean>?): kotlin.String declared in <root>'
        CONST String type=kotlin.String value="OK"