IrFile /implicitCastOnPlatformType.kt
  IrFunction public fun test(): kotlin.String
    IrExpressionBody
      BLOCK type=<no-type> hasResult=false operator=null
        RETURN type=<no-type>
          UNARY_OP operator=IMPLICIT_NOTNULL type=kotlin.String related=null
            CALL .getProperty type=kotlin.String! operator=null
              p0: LITERAL String type=kotlin.String value='test'
