When debug-on-error is enabled and an error occurs, a backtrace is
generated.
Clicking on a function in the stack opens a buffer with the cursor at the
start
of the function. It would be more useful to place the cursor at the point
of execution within that function.
There is no information in a compiled function to relate the point of
execution to a place in the source. The byte compiler maintains that
data structure for generating error messages, but does not output it
into a .elc file.
To put line-number data into the .elc file for the debugger to look at
could be a useful feature, but it's not a small job. If someone
implements this, we could install it after the release.
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