Feature request: function name / line number for invalid operation

[adamritter]

During using HVM I've got bitten by not too informative error messages like ,,invalid: mat-lam''

It would be extremely helpful to show the function name and line number (or even a ,,backtrace'' if it's possible) to make debugging HVML programs easier

[VictorTaelin]

I don't think this would be easy but would be great to have