eyre/
backtrace.rs

1#[cfg(backtrace)]
2pub(crate) use std::backtrace::Backtrace;
3
4#[cfg(not(backtrace))]
5pub(crate) enum Backtrace {}
6
7#[cfg(backtrace)]
8macro_rules! backtrace_if_absent {
9    ($err:expr) => {
10        match $err.backtrace() {
11            Some(_) => None,
12            None => Some(Backtrace::capture()),
13        }
14    };
15}
16
17#[cfg(not(backtrace))]
18macro_rules! backtrace_if_absent {
19    ($err:expr) => {
20        None
21    };
22}