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Backtrace support If an exception is raised inside an Lwt thread, the backtrace provided by OCaml will not be very useful. It will end inside the Lwt scheduler instead of continuing into the code that started the thread. To avoid this, and get good backtraces from Lwt, use the syntax extension in debug mode. In debug mode, the let%lwt construct will properly propagate backtraces. In the ppx syntax

JstableSys_jsTyped_arrayCSSDomDom_eventsDom_htmlDom_svgEventSourceFileFirebugFormGeolocationJsonMutationObserverRegexpUrlWebGLWebSocketsWorkerXmlHttpRequestJs_of_ocaml_lwt – API ReferenceLwt_jsonpLwt_xmlHttpRequestLwt_fileLwt_js_eventsLwt_jsLwt logger - API ReferenceLwt_log_jsGraphics - API ReferenceGraphics_jsDeriving - API ReferenceDeriving_JsonPa_deriving_JsonTyxml - API ReferenceTyxml_jsTyxml_