__traits(position,symbol) to get the file:line:column:index of a symbol (module,unittest etc)

[Timothee Cour via Digitalmars-d-learn]

Wouldn't that be nice?
it's all known at CT so why not expose it
among other things it'd allow proper association of modules to files in
stacktraces (sometimes this is impossible / ambiguous), custom user defined
error messages involving lambdas, printing unittest lines etc.