* New options
+set print symbol-loading (off|brief|full)
+show print symbol-loading
+ Control whether to print informational messages when loading symbol
+ information for a file. The default is "full", but when debugging
+ programs with large numbers of shared libraries the amount of output
+ becomes less useful.
+
set guile print-stack (none|message|full)
show guile print-stack
Show a stack trace when an error is encountered in a Guile script.