Require newer backtrace crate

[lo48576]

failure does not compile with backtrace-0.3.3 (as specified in Cargo.toml of failure).
It should be updated.

---

I tried to check whether my project compiles with minimal dependency versions to check Cargo.toml, but failed because one of deps uses failure and it accepts too old backtrace.

My environment is:

• Gentoo Linux x86_64
• rustc-1.34.1 stable
  • I used 1.36.0-nightly (e305df184 2019-04-24) to generate Cargo.toml with minimal deps versions, but I don't use it to compile and test the crate.

I tried 0.3.3 -- 0.3.12, but they all failed to compile.
With backtrace-0.3.13, compiles successfully.

With version = "0.3.12" for backtrace:

$ cargo +nightly update -Z minimal-versions && cargo test --all-features --verbose
    Updating crates.io index
       Fresh unicode-xid v0.1.0
       Fresh cc v1.0.0
       Fresh rustc-demangle v0.1.4
       Fresh cfg-if v0.1.0
       Fresh proc-macro2 v0.4.8
       Fresh quote v0.6.3
   Compiling syn v0.15.0
   Compiling backtrace-sys v0.1.17
       Fresh libc v0.2.45
     Running `rustc --crate-name syn /home/lo48576/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.15.0/src/lib.rs --color always --crate-type lib --emit=dep-info,link -C debuginfo=2 -
-cfg 'feature="clone-impls"' --cfg 'feature="default"' --cfg 'feature="derive"' --cfg 'feature="extra-traits"' --cfg 'feature="parsing"' --cfg 'feature="printing"' --cfg 'feature="proc-macro
"' --cfg 'feature="proc-macro2"' --cfg 'feature="quote"' --cfg 'feature="visit"' -C metadata=d11856994fd8305f -C extra-filename=-d11856994fd8305f --out-dir /home/lo48576/works/public/contrib
/failure/target/debug/deps -L dependency=/home/lo48576/works/public/contrib/failure/target/debug/deps --extern proc_macro2=/home/lo48576/works/public/contrib/failure/target/debug/deps/libpro
c_macro2-9efc4637933a1c09.rlib --extern quote=/home/lo48576/works/public/contrib/failure/target/debug/deps/libquote-af3aaac9b3bdf216.rlib --extern unicode_xid=/home/lo48576/works/public/cont
rib/failure/target/debug/deps/libunicode_xid-3579a4bd1835b24e.rlib --cap-lints allow`
     Running `/home/lo48576/works/public/contrib/failure/target/debug/build/backtrace-sys-731d700607af3f82/build-script-build`
   Compiling synstructure v0.10.0
     Running `rustc --crate-name synstructure /home/lo48576/.cargo/registry/src/github.com-1ecc6299db9ec823/synstructure-0.10.0/src/lib.rs --color always --crate-type lib --emit=dep-info,lin
k -C debuginfo=2 -C metadata=7bc10f70af82650c -C extra-filename=-7bc10f70af82650c --out-dir /home/lo48576/works/public/contrib/failure/target/debug/deps -L dependency=/home/lo48576/works/pub
lic/contrib/failure/target/debug/deps --extern proc_macro2=/home/lo48576/works/public/contrib/failure/target/debug/deps/libproc_macro2-9efc4637933a1c09.rlib --extern quote=/home/lo48576/work
s/public/contrib/failure/target/debug/deps/libquote-af3aaac9b3bdf216.rlib --extern syn=/home/lo48576/works/public/contrib/failure/target/debug/deps/libsyn-d11856994fd8305f.rlib --extern unic
ode_xid=/home/lo48576/works/public/contrib/failure/target/debug/deps/libunicode_xid-3579a4bd1835b24e.rlib --cap-lints allow`
     Running `rustc --crate-name backtrace_sys /home/lo48576/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-sys-0.1.17/src/lib.rs --color always --crate-type lib --emit=dep-info,l
ink -C debuginfo=2 -C metadata=b1cf48c04e38413f -C extra-filename=-b1cf48c04e38413f --out-dir /home/lo48576/works/public/contrib/failure/target/debug/deps -L dependency=/home/lo48576/works/p
ublic/contrib/failure/target/debug/deps --extern libc=/home/lo48576/works/public/contrib/failure/target/debug/deps/liblibc-3b524ef2d6fa4eb7.rlib --cap-lints allow -L native=/home/lo48576/wor
ks/public/contrib/failure/target/debug/build/backtrace-sys-5789c2c0c3d77600/out/.libs -l static=backtrace`
   Compiling backtrace v0.3.12
     Running `rustc --crate-name backtrace /home/lo48576/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.12/src/lib.rs --color always --crate-type lib --emit=dep-info,link -C d
ebuginfo=2 --cfg 'feature="backtrace-sys"' --cfg 'feature="coresymbolication"' --cfg 'feature="dbghelp"' --cfg 'feature="default"' --cfg 'feature="dladdr"' --cfg 'feature="libbacktrace"' --c
fg 'feature="libunwind"' --cfg 'feature="std"' -C metadata=8b172223bca3120e -C extra-filename=-8b172223bca3120e --out-dir /home/lo48576/works/public/contrib/failure/target/debug/deps -L depe
ndency=/home/lo48576/works/public/contrib/failure/target/debug/deps --extern backtrace_sys=/home/lo48576/works/public/contrib/failure/target/debug/deps/libbacktrace_sys-b1cf48c04e38413f.rlib
 --extern cfg_if=/home/lo48576/works/public/contrib/failure/target/debug/deps/libcfg_if-cf437c8c3a7cfcc3.rlib --extern libc=/home/lo48576/works/public/contrib/failure/target/debug/deps/libli
bc-3b524ef2d6fa4eb7.rlib --extern rustc_demangle=/home/lo48576/works/public/contrib/failure/target/debug/deps/librustc_demangle-52276abf4bd0e9fa.rlib --cap-lints allow -L native=/home/lo4857
6/works/public/contrib/failure/target/debug/build/backtrace-sys-5789c2c0c3d77600/out/.libs`
error: unexpected end of macro invocation
   --> /home/lo48576/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.12/src/lib.rs:105:6
    |
105 |     }
    |      ^ missing tokens in macro arguments

error: unexpected end of macro invocation
 --> /home/lo48576/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.12/src/symbolize/mod.rs:7:6
  |
7 |     }
  |      ^ missing tokens in macro arguments

error: unexpected end of macro invocation
   --> /home/lo48576/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.12/src/lib.rs:128:6
    |
128 |     }
    |      ^ missing tokens in macro arguments

error[E0433]: failed to resolve: use of undeclared type or module `Path`
   --> /home/lo48576/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.12/src/symbolize/mod.rs:130:26
    |
130 |                     Some(Path::new(OsStr::from_bytes(slice)))
    |                          ^^^^ use of undeclared type or module `Path`

error[E0412]: cannot find type `Path` in this scope
   --> /home/lo48576/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.12/src/symbolize/mod.rs:122:39
    |
122 |     pub fn filename(&self) -> Option<&Path> {
    |                                       ^^^^ not found in this scope
help: possible candidate is found in another module, you can import it into scope
    |
1   | use std::path::Path;
    |

error: aborting due to 5 previous errors

Some errors occurred: E0412, E0433.
For more information about an error, try `rustc --explain E0412`.
error: Could not compile `backtrace`.

Caused by:
  process didn't exit successfully: `rustc --crate-name backtrace /home/lo48576/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.12/src/lib.rs --color always --crate-type lib --
emit=dep-info,link -C debuginfo=2 --cfg 'feature="backtrace-sys"' --cfg 'feature="coresymbolication"' --cfg 'feature="dbghelp"' --cfg 'feature="default"' --cfg 'feature="dladdr"' --cfg 'feat
ure="libbacktrace"' --cfg 'feature="libunwind"' --cfg 'feature="std"' -C metadata=8b172223bca3120e -C extra-filename=-8b172223bca3120e --out-dir /home/lo48576/works/public/contrib/failure/ta
rget/debug/deps -L dependency=/home/lo48576/works/public/contrib/failure/target/debug/deps --extern backtrace_sys=/home/lo48576/works/public/contrib/failure/target/debug/deps/libbacktrace_sy
s-b1cf48c04e38413f.rlib --extern cfg_if=/home/lo48576/works/public/contrib/failure/target/debug/deps/libcfg_if-cf437c8c3a7cfcc3.rlib --extern libc=/home/lo48576/works/public/contrib/failure/
target/debug/deps/liblibc-3b524ef2d6fa4eb7.rlib --extern rustc_demangle=/home/lo48576/works/public/contrib/failure/target/debug/deps/librustc_demangle-52276abf4bd0e9fa.rlib --cap-lints allow
 -L native=/home/lo48576/works/public/contrib/failure/target/debug/build/backtrace-sys-5789c2c0c3d77600/out/.libs` (exit code: 1)
warning: build failed, waiting for other jobs to finish...
error: build failed

With version = "0.3.13" for backtrace:

$ cargo +nightly update -Z minimal-versions && cargo test --all-features --verbose
    Updating crates.io index
       Fresh unicode-xid v0.1.0
       Fresh cc v1.0.0
   Compiling autocfg v0.1.0
   Compiling cfg-if v0.1.6
       Fresh rustc-demangle v0.1.4
       Fresh proc-macro2 v0.4.8
     Running `rustc --crate-name autocfg /home/lo48576/.cargo/registry/src/github.com-1ecc6299db9ec823/autocfg-0.1.0/src/lib.rs --color always --crate-type lib --emit=dep-info,link -C debuginfo=2 -C metadata=3bec8eb4adde6d59 -C extra-filename=-3bec8eb4adde6d59 --out-dir /
home/lo48576/works/public/contrib/failure/target/debug/deps -L dependency=/home/lo48576/works/public/contrib/failure/target/debug/deps --cap-lints allow`
     Running `rustc --crate-name cfg_if /home/lo48576/.cargo/registry/src/github.com-1ecc6299db9ec823/cfg-if-0.1.6/src/lib.rs --color always --crate-type lib --emit=dep-info,link -C debuginfo=2 -C metadata=778a08baeabb17cf -C extra-filename=-778a08baeabb17cf --out-dir /ho
me/lo48576/works/public/contrib/failure/target/debug/deps -L dependency=/home/lo48576/works/public/contrib/failure/target/debug/deps --cap-lints allow`
       Fresh quote v0.6.3
       Fresh libc v0.2.45
       Fresh syn v0.15.0
       Fresh backtrace-sys v0.1.17
       Fresh synstructure v0.10.0
   Compiling failure_derive v0.1.5 (/home/lo48576/works/public/contrib/failure/failure_derive)
     Running `rustc --crate-name failure_derive failure_derive/src/lib.rs --color always --crate-type proc-macro --emit=dep-info,link -C prefer-dynamic -C debuginfo=2 -C metadata=a0bd02f577b87743 -C extra-filename=-a0bd02f577b87743 --out-dir /home/lo48576/works/public/con
trib/failure/target/debug/deps -C incremental=/home/lo48576/works/public/contrib/failure/target/debug/incremental -L dependency=/home/lo48576/works/public/contrib/failure/target/debug/deps --extern proc_macro2=/home/lo48576/works/public/contrib/failure/target/debug/deps/l
ibproc_macro2-9efc4637933a1c09.rlib --extern quote=/home/lo48576/works/public/contrib/failure/target/debug/deps/libquote-af3aaac9b3bdf216.rlib --extern syn=/home/lo48576/works/public/contrib/failure/target/debug/deps/libsyn-d11856994fd8305f.rlib --extern synstructure=/hom
e/lo48576/works/public/contrib/failure/target/debug/deps/libsynstructure-7bc10f70af82650c.rlib --cfg has_dyn_trait`
   Compiling backtrace v0.3.13
     Running `rustc --crate-name build_script_build /home/lo48576/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.13/build.rs --color always --crate-type bin --emit=dep-info,link -C debuginfo=2 --cfg 'feature="backtrace-sys"' --cfg 'feature="coresymbolicatio
n"' --cfg 'feature="dbghelp"' --cfg 'feature="default"' --cfg 'feature="dladdr"' --cfg 'feature="libbacktrace"' --cfg 'feature="libunwind"' --cfg 'feature="std"' -C metadata=00b626b600ddeaa9 -C extra-filename=-00b626b600ddeaa9 --out-dir /home/lo48576/works/public/contrib/
failure/target/debug/build/backtrace-00b626b600ddeaa9 -L dependency=/home/lo48576/works/public/contrib/failure/target/debug/deps --extern autocfg=/home/lo48576/works/public/contrib/failure/target/debug/deps/libautocfg-3bec8eb4adde6d59.rlib --cap-lints allow`
     Running `/home/lo48576/works/public/contrib/failure/target/debug/build/backtrace-00b626b600ddeaa9/build-script-build`
     Running `rustc --crate-name backtrace /home/lo48576/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.13/src/lib.rs --color always --crate-type lib --emit=dep-info,link -C debuginfo=2 --cfg 'feature="backtrace-sys"' --cfg 'feature="coresymbolication"' --c
fg 'feature="dbghelp"' --cfg 'feature="default"' --cfg 'feature="dladdr"' --cfg 'feature="libbacktrace"' --cfg 'feature="libunwind"' --cfg 'feature="std"' -C metadata=b8a2e79461b1841f -C extra-filename=-b8a2e79461b1841f --out-dir /home/lo48576/works/public/contrib/failure
/target/debug/deps -L dependency=/home/lo48576/works/public/contrib/failure/target/debug/deps --extern backtrace_sys=/home/lo48576/works/public/contrib/failure/target/debug/deps/libbacktrace_sys-b1cf48c04e38413f.rlib --extern cfg_if=/home/lo48576/works/public/contrib/fail
ure/target/debug/deps/libcfg_if-778a08baeabb17cf.rlib --extern libc=/home/lo48576/works/public/contrib/failure/target/debug/deps/liblibc-3b524ef2d6fa4eb7.rlib --extern rustc_demangle=/home/lo48576/works/public/contrib/failure/target/debug/deps/librustc_demangle-52276abf4b
d0e9fa.rlib --cap-lints allow --cfg rustc_1_30 -L native=/home/lo48576/works/public/contrib/failure/target/debug/build/backtrace-sys-5789c2c0c3d77600/out/.libs`
   Compiling failure v0.1.5 (/home/lo48576/works/public/contrib/failure)
     Running `rustc --crate-name failure src/lib.rs --color always --emit=dep-info,link -C debuginfo=2 --test --cfg 'feature="backtrace"' --cfg 'feature="default"' --cfg 'feature="derive"' --cfg 'feature="failure_derive"' --cfg 'feature="std"' -C metadata=2e23376e022f5d78
 -C extra-filename=-2e23376e022f5d78 --out-dir /home/lo48576/works/public/contrib/failure/target/debug/deps -C incremental=/home/lo48576/works/public/contrib/failure/target/debug/incremental -L dependency=/home/lo48576/works/public/contrib/failure/target/debug/deps --exte
rn backtrace=/home/lo48576/works/public/contrib/failure/target/debug/deps/libbacktrace-b8a2e79461b1841f.rlib --extern failure_derive=/home/lo48576/works/public/contrib/failure/target/debug/deps/libfailure_derive-a0bd02f577b87743.so -L native=/home/lo48576/works/public/con
trib/failure/target/debug/build/backtrace-sys-5789c2c0c3d77600/out/.libs`
     Running `rustc --crate-name failure src/lib.rs --color always --crate-type lib --emit=dep-info,link -C debuginfo=2 --cfg 'feature="backtrace"' --cfg 'feature="default"' --cfg 'feature="derive"' --cfg 'feature="failure_derive"' --cfg 'feature="std"' -C metadata=37a135
5e6dfc432e -C extra-filename=-37a1355e6dfc432e --out-dir /home/lo48576/works/public/contrib/failure/target/debug/deps -C incremental=/home/lo48576/works/public/contrib/failure/target/debug/incremental -L dependency=/home/lo48576/works/public/contrib/failure/target/debug/d
eps --extern backtrace=/home/lo48576/works/public/contrib/failure/target/debug/deps/libbacktrace-b8a2e79461b1841f.rlib --extern failure_derive=/home/lo48576/works/public/contrib/failure/target/debug/deps/libfailure_derive-a0bd02f577b87743.so -L native=/home/lo48576/works/
public/contrib/failure/target/debug/build/backtrace-sys-5789c2c0c3d77600/out/.libs`
     Running `rustc --crate-name error_as_cause examples/error_as_cause.rs --color always --crate-type bin --emit=dep-info,link -C debuginfo=2 --cfg 'feature="backtrace"' --cfg 'feature="default"' --cfg 'feature="derive"' --cfg 'feature="failure_derive"' --cfg 'feature="s
td"' -C metadata=9c275366ce2fafbf -C extra-filename=-9c275366ce2fafbf --out-dir /home/lo48576/works/public/contrib/failure/target/debug/examples -C incremental=/home/lo48576/works/public/contrib/failure/target/debug/incremental -L dependency=/home/lo48576/works/public/con
trib/failure/target/debug/deps --extern backtrace=/home/lo48576/works/public/contrib/failure/target/debug/deps/libbacktrace-b8a2e79461b1841f.rlib --extern failure=/home/lo48576/works/public/contrib/failure/target/debug/deps/libfailure-37a1355e6dfc432e.rlib --extern failur
e_derive=/home/lo48576/works/public/contrib/failure/target/debug/deps/libfailure_derive-a0bd02f577b87743.so -L native=/home/lo48576/works/public/contrib/failure/target/debug/build/backtrace-sys-5789c2c0c3d77600/out/.libs`
     Running `rustc --crate-name basic_fail tests/basic_fail.rs --color always --emit=dep-info,link -C debuginfo=2 --test --cfg 'feature="backtrace"' --cfg 'feature="default"' --cfg 'feature="derive"' --cfg 'feature="failure_derive"' --cfg 'feature="std"' -C metadata=1071
fd45de85583b -C extra-filename=-1071fd45de85583b --out-dir /home/lo48576/works/public/contrib/failure/target/debug/deps -C incremental=/home/lo48576/works/public/contrib/failure/target/debug/incremental -L dependency=/home/lo48576/works/public/contrib/failure/target/debug
/deps --extern backtrace=/home/lo48576/works/public/contrib/failure/target/debug/deps/libbacktrace-b8a2e79461b1841f.rlib --extern failure=/home/lo48576/works/public/contrib/failure/target/debug/deps/libfailure-37a1355e6dfc432e.rlib --extern failure_derive=/home/lo48576/wo
rks/public/contrib/failure/target/debug/deps/libfailure_derive-a0bd02f577b87743.so -L native=/home/lo48576/works/public/contrib/failure/target/debug/build/backtrace-sys-5789c2c0c3d77600/out/.libs`
     Running `rustc --crate-name bail_ensure examples/bail_ensure.rs --color always --crate-type bin --emit=dep-info,link -C debuginfo=2 --cfg 'feature="backtrace"' --cfg 'feature="default"' --cfg 'feature="derive"' --cfg 'feature="failure_derive"' --cfg 'feature="std"' -
C metadata=c22837a85abcdb54 -C extra-filename=-c22837a85abcdb54 --out-dir /home/lo48576/works/public/contrib/failure/target/debug/examples -C incremental=/home/lo48576/works/public/contrib/failure/target/debug/incremental -L dependency=/home/lo48576/works/public/contrib/f
ailure/target/debug/deps --extern backtrace=/home/lo48576/works/public/contrib/failure/target/debug/deps/libbacktrace-b8a2e79461b1841f.rlib --extern failure=/home/lo48576/works/public/contrib/failure/target/debug/deps/libfailure-37a1355e6dfc432e.rlib --extern failure_deri
ve=/home/lo48576/works/public/contrib/failure/target/debug/deps/libfailure_derive-a0bd02f577b87743.so -L native=/home/lo48576/works/public/contrib/failure/target/debug/build/backtrace-sys-5789c2c0c3d77600/out/.libs`
     Running `rustc --crate-name simple examples/simple.rs --color always --crate-type bin --emit=dep-info,link -C debuginfo=2 --cfg 'feature="backtrace"' --cfg 'feature="default"' --cfg 'feature="derive"' --cfg 'feature="failure_derive"' --cfg 'feature="std"' -C metadata
=f786d48e9f38f4df -C extra-filename=-f786d48e9f38f4df --out-dir /home/lo48576/works/public/contrib/failure/target/debug/examples -C incremental=/home/lo48576/works/public/contrib/failure/target/debug/incremental -L dependency=/home/lo48576/works/public/contrib/failure/tar
get/debug/deps --extern backtrace=/home/lo48576/works/public/contrib/failure/target/debug/deps/libbacktrace-b8a2e79461b1841f.rlib --extern failure=/home/lo48576/works/public/contrib/failure/target/debug/deps/libfailure-37a1355e6dfc432e.rlib --extern failure_derive=/home/l
o48576/works/public/contrib/failure/target/debug/deps/libfailure_derive-a0bd02f577b87743.so -L native=/home/lo48576/works/public/contrib/failure/target/debug/build/backtrace-sys-5789c2c0c3d77600/out/.libs`
     Running `rustc --crate-name fail_compat tests/fail_compat.rs --color always --emit=dep-info,link -C debuginfo=2 --test --cfg 'feature="backtrace"' --cfg 'feature="default"' --cfg 'feature="derive"' --cfg 'feature="failure_derive"' --cfg 'feature="std"' -C metadata=85
ac7485d86b7bd9 -C extra-filename=-85ac7485d86b7bd9 --out-dir /home/lo48576/works/public/contrib/failure/target/debug/deps -C incremental=/home/lo48576/works/public/contrib/failure/target/debug/incremental -L dependency=/home/lo48576/works/public/contrib/failure/target/deb
ug/deps --extern backtrace=/home/lo48576/works/public/contrib/failure/target/debug/deps/libbacktrace-b8a2e79461b1841f.rlib --extern failure=/home/lo48576/works/public/contrib/failure/target/debug/deps/libfailure-37a1355e6dfc432e.rlib --extern failure_derive=/home/lo48576/
works/public/contrib/failure/target/debug/deps/libfailure_derive-a0bd02f577b87743.so -L native=/home/lo48576/works/public/contrib/failure/target/debug/build/backtrace-sys-5789c2c0c3d77600/out/.libs`
     Running `rustc --crate-name macro_trailing_comma tests/macro_trailing_comma.rs --color always --emit=dep-info,link -C debuginfo=2 --test --cfg 'feature="backtrace"' --cfg 'feature="default"' --cfg 'feature="derive"' --cfg 'feature="failure_derive"' --cfg 'feature="st
d"' -C metadata=92804c55f2202c86 -C extra-filename=-92804c55f2202c86 --out-dir /home/lo48576/works/public/contrib/failure/target/debug/deps -C incremental=/home/lo48576/works/public/contrib/failure/target/debug/incremental -L dependency=/home/lo48576/works/public/contrib/
failure/target/debug/deps --extern backtrace=/home/lo48576/works/public/contrib/failure/target/debug/deps/libbacktrace-b8a2e79461b1841f.rlib --extern failure=/home/lo48576/works/public/contrib/failure/target/debug/deps/libfailure-37a1355e6dfc432e.rlib --extern failure_der
ive=/home/lo48576/works/public/contrib/failure/target/debug/deps/libfailure_derive-a0bd02f577b87743.so -L native=/home/lo48576/works/public/contrib/failure/target/debug/build/backtrace-sys-5789c2c0c3d77600/out/.libs`
     Running `rustc --crate-name string_custom_error_pattern examples/string_custom_error_pattern.rs --color always --crate-type bin --emit=dep-info,link -C debuginfo=2 --cfg 'feature="backtrace"' --cfg 'feature="default"' --cfg 'feature="derive"' --cfg 'feature="failure_
derive"' --cfg 'feature="std"' -C metadata=f96b7cfe9fb35fa0 -C extra-filename=-f96b7cfe9fb35fa0 --out-dir /home/lo48576/works/public/contrib/failure/target/debug/examples -C incremental=/home/lo48576/works/public/contrib/failure/target/debug/incremental -L dependency=/hom
e/lo48576/works/public/contrib/failure/target/debug/deps --extern backtrace=/home/lo48576/works/public/contrib/failure/target/debug/deps/libbacktrace-b8a2e79461b1841f.rlib --extern failure=/home/lo48576/works/public/contrib/failure/target/debug/deps/libfailure-37a1355e6df
c432e.rlib --extern failure_derive=/home/lo48576/works/public/contrib/failure/target/debug/deps/libfailure_derive-a0bd02f577b87743.so -L native=/home/lo48576/works/public/contrib/failure/target/debug/build/backtrace-sys-5789c2c0c3d77600/out/.libs`
warning: unused `#[macro_use]` import
 --> examples/error_as_cause.rs:1:1
  |
1 | #[macro_use]
  | ^^^^^^^^^^^^
  |
  = note: #[warn(unused_imports)] on by default

warning: unused `#[macro_use]` import
 --> examples/simple.rs:1:1
  |
1 | #[macro_use]
  | ^^^^^^^^^^^^
  |
  = note: #[warn(unused_imports)] on by default

warning: unused `#[macro_use]` import
 --> tests/fail_compat.rs:1:1
  |
1 | #[macro_use]
  | ^^^^^^^^^^^^
  |
  = note: #[warn(unused_imports)] on by default

warning: unused `#[macro_use]` import
 --> tests/basic_fail.rs:1:1
  |
1 | #[macro_use]
  | ^^^^^^^^^^^^
  |
  = note: #[warn(unused_imports)] on by default

    Finished dev [unoptimized + debuginfo] target(s) in 1.58s
     Running `/home/lo48576/works/public/contrib/failure/target/debug/deps/failure-2e23376e022f5d78`

running 7 tests
test backtrace::internal::tests::always_enabled_if_failure_is_set_to_yes ... ok
test backtrace::internal::tests::follows_general_if_failure_is_not_set ... ok
test context::test_map ... ok
test error::test::assert_error_is_just_data ... ok
test error::test::downcast_can_be_used ... ok
test backtrace::internal::tests::never_enabled_if_failure_is_set_to_no ... ok
test error::test::methods_seem_to_work ... ok

test result: ok. 7 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out

     Running `/home/lo48576/works/public/contrib/failure/target/debug/deps/basic_fail-1071fd45de85583b`

running 1 test
test test_name ... ok

test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out

     Running `/home/lo48576/works/public/contrib/failure/target/debug/deps/fail_compat-85ac7485d86b7bd9`

running 2 tests
test smoke_compat_send_sync ... ok
test smoke_default_compat ... ok

test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out

     Running `/home/lo48576/works/public/contrib/failure/target/debug/deps/macro_trailing_comma-92804c55f2202c86`

running 4 tests
test bail ... ok
test ensure ... ok
test format_err ... ok
test single_arg_ensure ... ok

test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out

   Doc-tests failure
     Running `rustdoc --test /home/lo48576/works/public/contrib/failure/src/lib.rs --crate-name failure -L dependency=/home/lo48576/works/public/contrib/failure/target/debug/deps -L native=/home/lo48576/works/public/contrib/failure/target/debug/build/backtrace-sys-5789c2c
0c3d77600/out/.libs -L dependency=/home/lo48576/works/public/contrib/failure/target/debug/deps --cfg 'feature="failure_derive"' --cfg 'feature="std"' --cfg 'feature="backtrace"' --cfg 'feature="derive"' --cfg 'feature="default"' --extern backtrace=/home/lo48576/works/publ
ic/contrib/failure/target/debug/deps/libbacktrace-b8a2e79461b1841f.rlib --extern failure=/home/lo48576/works/public/contrib/failure/target/debug/deps/libfailure-37a1355e6dfc432e.rlib --extern failure_derive=/home/lo48576/works/public/contrib/failure/target/debug/deps/libf
ailure_derive-a0bd02f577b87743.so`

running 7 tests
test src/macros.rs - bail (line 6) ... ignored
test src/error/mod.rs - error::Error::from_boxed_compat (line 49) ... ok
test src/macros.rs - format_err (line 53) ... ok
test src/sync_failure.rs - sync_failure::SyncFailure<E>::new (line 25) ... ok
test src/result_ext.rs - result_ext::ResultExt::context (line 67) ... ok
test src/result_ext.rs - result_ext::ResultExt::compat (line 12) ... ok
test src/result_ext.rs - result_ext::ResultExt::with_context (line 110) ... ok

test result: ok. 6 passed; 0 failed; 1 ignored; 0 measured; 0 filtered out

[lo48576]

Hmm, test failed because Cargo.lock.ci for rust 1.18.0 uses libc-0.2.43 but backtrace-0.3.13 requires libc-0.2.45 or later.
How should this be fixed...?

[bnjbvr]

Hi! I'd be interested about this for Cranelift, where we realized that relying on failure/std meant breaking builds on windows aarch64 builds, since support for win aarch64 has been added in backtrace 0.3.15.

(Disclaimer: I'm not a repository maintainer nor do I know how this is supposed to work, but) I'd expect the next step would be to update Cargo.lock.ci to match a fresh and locally generated Cargo.lock file.