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[api] Make running scripts in AddMessageListener callback work in deb…
…ug mode The existance of an `AllowJavascriptExecutionDebugOnly` scope in `Isolate::ReportPendingMessages()` indicates that the API supports running arbitrary JS code in a `AddMessageListener` callback. Currently, this can fail in debug mode: The `!isolate->external_caught_exception()` condition is checked when entering API methods inside such a handler. However, if there is a verbose `TryCatch` active when the exception occurs, this check fails, and when calling `ToString()` on the exception object leaves a pending exception itself, the flag is re-set to `true`. Fix this problem by clearing the flag and the pending exception if there was one during `ToString()`. This matches the code a few lines up in `messages.cc`, so the exception state is now consistent during the callback. This currently makes a Node.js test fail in debug mode (`parallel/test-error-reporting`). Bug: node:7144 Bug: node:17016 Change-Id: I060d00fea3e9a497f4df34c6ff8d6e29ebe96321 Reviewed-on: https://chromium-review.googlesource.com/718096 Commit-Queue: Yang Guo <yangguo@chromium.org> Reviewed-by: Yang Guo <yangguo@chromium.org> Cr-Commit-Position: refs/heads/master@{#49466}
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