syntax template error should point to location

Created by: jlongster

The error Error: replacement values for syntax template must not be null or undefined when you do something like this:

const x = null;
const tmpl = #`${x}`;

The error doesn't give you any idea of the location in the source though, so it's very difficult to debug. It should at least give you a line number, and ideally point to a specific expression.