OpenEuphoria

Not that any of this is likely to happen any time soon, but what I've gathered so far:

The notion of extendable, re-usable "contexts" is getting more and more appealing to me.

Fatal errors should(must) terminate (in) the supplied context rather than the host context.
A context contains enough (error) information to determine precisely what just happened, eg:

code = "a = 1\n"& 
       "b = 2/0\n"& 
       "c = 3" 
context = string_exec(context,code) 

Somewhere in context (I am implying the above is not the first time it is used), there should now be one of:

• line 1, variable a has not been defined