FILE fqName:<root> fileName:/test.kt
  FUN name:box visibility:public modality:FINAL <> () returnType:kotlin.String
    BLOCK_BODY
      VAR name:map type:kotlin.collections.MutableMap<<root>.Fun, kotlin.String> [val]
        CALL 'public final fun mutableMapOf <K, V> (): kotlin.collections.MutableMap<K of kotlin.collections.mutableMapOf, V of kotlin.collections.mutableMapOf> declared in kotlin.collections' type=kotlin.collections.MutableMap<<root>.Fun, kotlin.String> origin=null
          <K>: <root>.Fun
          <V>: kotlin.String
      VAR name:fn type:<root>.Fun [val]
        TYPE_OP type=<root>.Fun origin=SAM_CONVERSION typeOperand=<root>.Fun
          FUN_EXPR type=kotlin.Function1<@[ParameterName(name = "string")] @[FlexibleNullability] kotlin.String?, @[FlexibleNullability] kotlin.String?> origin=LAMBDA
            FUN LOCAL_FUNCTION_FOR_LAMBDA name:<anonymous> visibility:local modality:FINAL <> (it:@[FlexibleNullability] kotlin.String?) returnType:@[FlexibleNullability] kotlin.String?
              VALUE_PARAMETER name:it index:0 type:@[FlexibleNullability] kotlin.String?
              BLOCK_BODY
                RETURN type=kotlin.Nothing from='local final fun <anonymous> (it: @[FlexibleNullability] kotlin.String?): @[FlexibleNullability] kotlin.String? declared in <root>.box'
                  CALL 'public final fun TODO (): kotlin.Nothing declared in kotlin' type=kotlin.Nothing origin=null
      RETURN type=kotlin.Nothing from='public final fun box (): kotlin.String declared in <root>'
        TYPE_OP type=kotlin.String origin=IMPLICIT_NOTNULL typeOperand=kotlin.String
          CALL 'public open fun computeIfAbsent (p0: @[EnhancedNullability] K of kotlin.collections.MutableMap, p1: @[EnhancedNullability] java.util.function.Function<in @[EnhancedNullability] K of kotlin.collections.MutableMap, out @[EnhancedNullability] V of kotlin.collections.MutableMap>): @[EnhancedNullability] V of kotlin.collections.MutableMap declared in kotlin.collections.MutableMap' type=@[EnhancedNullability] kotlin.String origin=null
            $this: GET_VAR 'val map: kotlin.collections.MutableMap<<root>.Fun, kotlin.String> declared in <root>.box' type=kotlin.collections.MutableMap<<root>.Fun, kotlin.String> origin=null
            p0: GET_VAR 'val fn: <root>.Fun declared in <root>.box' type=<root>.Fun origin=null
            p1: TYPE_OP type=@[EnhancedNullability] java.util.function.Function<kotlin.Any?, @[EnhancedNullability] kotlin.String> origin=SAM_CONVERSION typeOperand=@[EnhancedNullability] java.util.function.Function<kotlin.Any?, @[EnhancedNullability] kotlin.String>
              TYPE_OP type=kotlin.Function1<@[EnhancedNullability] kotlin.Any?, @[EnhancedNullability] kotlin.String> origin=IMPLICIT_CAST typeOperand=kotlin.Function1<@[EnhancedNullability] kotlin.Any?, @[EnhancedNullability] kotlin.String>
                FUN_EXPR type=kotlin.Function1<@[EnhancedNullability] <root>.Fun, @[EnhancedNullability] kotlin.String> origin=LAMBDA
                  FUN LOCAL_FUNCTION_FOR_LAMBDA name:<anonymous> visibility:local modality:FINAL <> (it:@[EnhancedNullability] <root>.Fun) returnType:@[EnhancedNullability] kotlin.String
                    VALUE_PARAMETER name:it index:0 type:@[EnhancedNullability] <root>.Fun
                    BLOCK_BODY
                      RETURN type=kotlin.Nothing from='local final fun <anonymous> (it: @[EnhancedNullability] <root>.Fun): @[EnhancedNullability] kotlin.String declared in <root>.box'
                        CONST String type=kotlin.String value="OK"