I'm trying to use Toploop within a program I'm working on and some code 
I'm feeding it is causing a type error.  Unfortunately, the best I've 
been able to figure out is to use Toploop.print_exception_outcome or 
Pcaml.report_error which just tell me


	Uncaught exception: Typecore.Error (_, _)


Are there any hooks for printing out a useful type error message?  Or am 
I going to need to compile directly against the type-checking code from 
the compiler?  Thanks!