Filter backtrace

[Yamakaky]

Currently, the generated backtrace is something like

   0:     0x55590e70c461 - backtrace::backtrace::libunwind::trace
                        at /home/yamakaky/.cache/cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.0/src/backtrace/mod.rs:90
                         - backtrace::backtrace::trace<closure>
                        at /home/yamakaky/.cache/cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.0/src/backtrace/mod.rs:42
   1:     0x55590e70d2b0 - backtrace::capture::{{impl}}::new
                        at /home/yamakaky/.cache/cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.0/src/lib.rs:101
   2:     0x55590e704491 - error_chain::make_backtrace
                        at /home/yamakaky/dev/rust/error-chain/src/lib.rs:416
   3:     0x55590e6fe8f0 - core::option::{{impl}}::or_else<alloc::arc::Arc<backtrace::capture::Backtrace>,fn() -> core::option::Option<alloc::arc::Arc<backtrace::capture::Backtrace>>>
                        at /buildslave/rust-buildbot/slave/stable-dist-rustc-linux/build/obj/../src/libcore/option.rs:631
   4:     0x55590e6fe5fa - error_chain::{{impl}}::new<quickstart::errors::Error>
                        at /home/yamakaky/dev/rust/error-chain/src/lib.rs:467
   5:     0x55590e702460 - quickstart::errors::{{impl}}::chain_err::{{closure}}<std::fs::File,std::io::error::Error,closure,&str>
                        at /home/yamakaky/dev/rust/error-chain/examples/quickstart.rs:17
   6:     0x55590e6fed1c - core::result::{{impl}}::map_err<std::fs::File,std::io::error::Error,quickstart::errors::Error,closure>
                        at /buildslave/rust-buildbot/slave/stable-dist-rustc-linux/build/obj/../src/libcore/result.rs:494
   7:     0x55590e701bef - quickstart::errors::{{impl}}::chain_err<std::fs::File,std::io::error::Error,closure,&str>
                        at /home/yamakaky/dev/rust/error-chain/examples/quickstart.rs:17
   8:     0x55590e701666 - quickstart::run
                        at /home/yamakaky/dev/rust/error-chain/examples/quickstart.rs:33
   9:     0x55590e701ed8 - quickstart::main
                        at /home/yamakaky/dev/rust/error-chain/examples/quickstart.rs:24
  10:     0x55590e7258e6 - __rust_maybe_catch_panic
  11:     0x55590e71c9f1 - std::rt::lang_start::h538f8960e7644c80
  12:     0x55590e7026d3 - main
  13:     0x7f93d53dd290 - __libc_start_main
  14:     0x55590e6fe429 - _start
  15:                0x0 - <unknown>

The frame 0 and 1 could be removed since they are not relevant. Maybe add RUST_BACKTRACE=full to keep them.

[alexcrichton]

Thanks for the report! This is similar to rust-lang/rust#37783, and I wonder if we could develop solutions in tandem perhaps?

[Yamakaky]

Yeah, you're right.