How to I print a RUST_BACKTRACE=1-style backtrace of an ERROR entry printed by tracing-subscriber?

[vi]

I see just a single line: <ts> ERROR <module> <message> from the code that uses simple tracing_subscriber::fmt::init().

How do I make it also capture and print the call stack?
Is there some panic-on-error environment variable or something like that?

[clarkmcc]

Bumping, I'd also like to know

[kaffarell]

AFAIK this is not built into tracing right now. You can print a backtrace using https://doc.rust-lang.org/std/backtrace/index.html though.