coverage: Don't underflow column number I noticed this when running coverage on a debug build of rustc. There may be other places that do this but I'm just fixing the one I hit. r? `@wesleywiser` `@richkadel`
coverage: Don't underflow column number I noticed this when running coverage on a debug build of rustc. There may be other places that do this but I'm just fixing the one I hit. r? `@wesleywiser` `@richkadel`