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remove second backtrace

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Steve Klabnik 2016-08-25 16:31:50 -04:00 committed by Carol (Nichols || Goulding)
parent e35e0e1039
commit 80c97251b8
1 changed files with 1 additions and 40 deletions
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41
src/ch07-02-unrecoverable-errors-with-panic.md
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@ -96,46 +96,7 @@ error: Process didn't exit successfully: `target/debug/panic` (exit code: 101)
```
That's a lot of output! Line `11` there has the line in our project:
`src/main.rs` line four. We've been looking at the error message, but Cargo
also told us something important about backtraces early on: `[unoptimized +
debuginfo]`. 'debuginfo' is what enables the file names to be shown here.
If we instead compile with `--release`:
```bash
$ RUST_BACKTRACE=1 cargo run --release
Compiling panic v0.1.0 (file:///home/steve/tmp/panic)
Finished release [optimized] target(s) in 0.28 secs
Running `target/release/panic`
thread 'main' panicked at 'index out of bounds: the len is 3 but the index is
100', ../src/libcollections/vec.rs:1265
stack backtrace:
1: 0x565238fd0e79 -
std::sys::backtrace::tracing::imp::write::h482d45d91246faa2
2: 0x565238fd37ec -
std::panicking::default_hook::_{{closure}}::h89158f66286b674e
3: 0x565238fd2cae - std::panicking::default_hook::h9e30d428ee3b0c43
4: 0x565238fd3318 -
std::panicking::rust_panic_with_hook::h2224f33fb7bf2f4c
5: 0x565238fd31b2 - std::panicking::begin_panic::hcb11a4dc6d779ae5
6: 0x565238fd30e0 - std::panicking::begin_panic_fmt::h310416c62f3935b3
7: 0x565238fd3061 - rust_begin_unwind
8: 0x565239008dbf - core::panicking::panic_fmt::hc5789f4e80194729
9: 0x565239008d63 -
core::panicking::panic_bounds_check::hb2d969c3cc11ed08
10: 0x565238fcc526 - panic::main::h2d7d3751fb8705e2
11: 0x565238fdb2d6 - __rust_maybe_catch_panic
12: 0x565238fd2412 - std::rt::lang_start::h352a66f5026f54bd
13: 0x7f36aad6372f - __libc_start_main
14: 0x565238fcc408 - _start
15: 0x0 - <unknown>
error: Process didn't exit successfully: `target/release/panic` (exit code:
101)
```
Now it just says 'optimized', and we don't have the file names any more. These
settings are only the default; you can include debuginfo in a release build,
or exclude it from a debug build, by configuring Cargo. See its documentation
for more details: http://doc.crates.io/manifest.html#the-profile-sections
`src/main.rs` line four.
So why does Rust panic here? In this case, using `[]` is supposed to return
a number. But if you pass it an invalid index, there's no number Rust could