Here's a problem with how tracebug evaluates code chunks.

(1) set ess-inject-source to t

(2) Create an .R file with some code chunks that take an appreciable time
to evaluate. Then send a series of chunks using C-c -C-c (or faster: C-c
C-c, C-x C-z, z, z, z, z, z). The point is that ESS is sending chunks
faster than the R process runs them.

This results in ESS deleting temporary files before R can see them,
resulting in errors like:

> Error in file(filename, "r", encoding = encoding) :
  cannot open the connection
In addition: Warning message:
In file(filename, "r", encoding = encoding) :
  cannot open file
'/var/folders/Zz/ZzJ1nC8pHNGtZb-btS+lGU+++Tc/-Tmp-/ESS-region/bdd.R@241':
No such file or directory

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