stack trace is often mostly unusable

[vegashacker]

Stack traces in LeftParen? often begin like this, apparently skipping over the part of the trace you actually care about. This makes it sometimes extremely hard to debug.

=== context ===
core
...r/private/servlet.ss:31:19
...r/private/servlet.ss:31:19
/Applications/PLT Scheme v4.1.0.3/collects/web-server/dispatchers/dispatch-servlets.ss:53:2\
: servlet-content-producer/path
dispatcher/c
dispatcher/c
/Applications/PLT Scheme v4.1.0.3/collects/scheme/private/more-scheme.ss:170:2: select-hand\
ler/no-breaks
[snip]