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Need support for including line number references in stack traces when available #132

@rpkyle

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@rpkyle

Since #87, we have provided stack trace messages when debug=TRUE:

image

These messages have lacked line number information, which limits their utility for debugging purposes since the location of the code which resulted in the error is not provided. In #127, the path to the source file is now stored whenever source or Rscript are used to launch the app.

This has the side benefit of enabling retrieval of line numbers via the srcref attribute, using srcfile:

https://stat.ethz.ch/R-manual/R-devel/library/base/html/srcfile.html

We should take advantage of this functionality to include line numbers when available.

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enhancementparityModifications to improve parity across Dash implementations

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