Source lines inside of standard library macros are wrong

[jdm]

They show up as the really really unhelpful <std macros:N>, which is really annoying for things like asssertion failures where it would be nice to see the original source line that invoked it instead.

[steveklabnik]

Triage: I'm not aware of any changes here today.

[Mark-Simulacrum]

I believe this has since been fixed (we no longer generate the <std macros:N> lines, anyway). Given the lack of test case I'm going to go ahead and close.