pub struct Backtrace { /* fields omitted */ }
A Backtrace
.
This is an opaque wrapper around the backtrace provided by
libbacktrace. A variety of optimizations have been performed to avoid
unnecessary or ill-advised work:
- If this crate is compiled in
no_std
compatible mode, Backtrace
is an empty struct, and will be completely compiled away.
- If this crate is run without the
RUST_BACKTRACE
environmental
variable enabled, the backtrace will not be generated at runtime.
- Even if a backtrace is generated, the most expensive part of
generating a backtrace is symbol resolution. This backtrace does not
perform symbol resolution until it is actually read (e.g. by
printing it). If the Backtrace is never used for anything, symbols
never get resolved.
Even with these optimizations, including a backtrace in your failure
may not be appropriate to your use case. You are not required to put a
backtrace in a custom Fail
type.
Constructs a new backtrace. This will only create a real backtrace
if the crate is compiled in std mode and the RUST_BACKTRACE
environmental variable is activated.
Returns the "default value" for a type. Read more
Formats the value using the given formatter. Read more
Formats the value using the given formatter. Read more