FILE fqName:<root> fileName:/nnStringVsTXString.kt
  FUN name:useTX visibility:public modality:FINAL <T> (x:T of <root>.useTX, fn:kotlin.Function0<T of <root>.useTX>) returnType:T of <root>.useTX
    TYPE_PARAMETER name:T index:0 variance: superTypes:[kotlin.Any?] reified:false
    VALUE_PARAMETER name:x index:0 type:T of <root>.useTX
    VALUE_PARAMETER name:fn index:1 type:kotlin.Function0<T of <root>.useTX>
    BLOCK_BODY
      RETURN type=kotlin.Nothing from='public final fun useTX <T> (x: T of <root>.useTX, fn: kotlin.Function0<T of <root>.useTX>): T of <root>.useTX declared in <root>'
        CALL 'public abstract fun invoke (): R of kotlin.Function0 [operator] declared in kotlin.Function0' type=T of <root>.useTX origin=INVOKE
          $this: GET_VAR 'fn: kotlin.Function0<T of <root>.useTX> declared in <root>.useTX' type=kotlin.Function0<T of <root>.useTX> origin=VARIABLE_AS_FUNCTION
  FUN name:testWithNullCheck visibility:public modality:FINAL <> () returnType:kotlin.Unit
    BLOCK_BODY
      TYPE_OP type=kotlin.Unit origin=IMPLICIT_COERCION_TO_UNIT typeOperand=kotlin.Unit
        CALL 'public final fun useTX <T> (x: T of <root>.useTX, fn: kotlin.Function0<T of <root>.useTX>): T of <root>.useTX declared in <root>' type=kotlin.String origin=null
          <T>: kotlin.String
          x: CONST String type=kotlin.String value=""
          fn: FUN_EXPR type=kotlin.Function0<kotlin.String> origin=LAMBDA
            FUN LOCAL_FUNCTION_FOR_LAMBDA name:<anonymous> visibility:local modality:FINAL <> () returnType:kotlin.String
              BLOCK_BODY
                RETURN type=kotlin.Nothing from='local final fun <anonymous> (): kotlin.String declared in <root>.testWithNullCheck'
                  TYPE_OP type=kotlin.String origin=IMPLICIT_NOTNULL typeOperand=kotlin.String
                    CALL 'public open fun notNullString (): @[EnhancedNullability] kotlin.String declared in <root>.J' type=@[EnhancedNullability] kotlin.String origin=null
