I do believe it's non-zero, as the stack has to be walked and potentially symbols are looked up. The symbols can be delayed until display time, but the stalk wa

I do believe it's non-zero, as the stack has to be walked and potentially symbols are looked up. The symbols can be delayed until display time, but the stalk walk is "now or never", as I understand it. SNAFU addresses this by allowing `Option<Backtrace>` in the error struct. The backtrace is only captured when an environment variable is set by the end user.