An uncaught exception shows a backtrace (actually a return stack dump, see Error messages). If the return stack entry is a return address, the immediately preceding location produced the call that the return address would have returned from, and is shown as word in the backtrace. You can inspect the source code of such a call with the following words:
Show the source code corresponding to the backtrace line with
index u (indices are shown in the backtrace after the file
name and position information and before the return stack
content and its interpretation as return address), set the
current location there, and then call fancy-after-l for
navigating the displayed source (including switching to the
next or previous result).
Show the source code corresponding to the next backtrace line
and set the current location there. The “next backtrace line
wraps around to the first one if you reach the end. Then call
fancy-after-l for navigating the displayed source
(including switching to the next or previous result).
Show the source code corresponding to the previous backtrace line
and set the current location there. The “previous backtrace line”
wraps around to the last one if you reach the beginning.
Then call fancy-after-l for navigating the displayed
source (including switching to the next or previous result).