Build error with broken dependency: backtrace

[xiaoniu-578fa6bff964d005]

Local compiler:
rustc --version
rustc 1.31.0 (abe02cefd 2018-12-04)
rustc +nightly --version
rustc 1.32.0-nightly (f4a421ee3 2018-12-13)

errors:

error[E0308]: mismatched types
   --> /home/xiaoniu/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.12/src/symbolize/libbacktrace.rs:156:60
    |
156 |         STATE = bt::backtrace_create_state(ptr::null(), 0, error_cb,
    |                                                            ^^^^^^^^ expected enum `std::os::raw::c_void`, found enum `libc::c_void`                                                                                                                                    
    |
    = note: expected type `extern "C" fn(*mut std::os::raw::c_void, *const i8, i32)`
               found type `extern "C" fn(*mut libc::c_void, *const i8, i32) {symbolize::libbacktrace::error_cb}`

error[E0308]: mismatched types
   --> /home/xiaoniu/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.12/src/symbolize/libbacktrace.rs:172:36
    |
172 |                                    pcinfo_cb, error_cb,
    |                                    ^^^^^^^^^ expected enum `std::os::raw::c_void`, found enum `libc::c_void`
    |
    = note: expected type `extern "C" fn(*mut std::os::raw::c_void, usize, *const i8, i32, *const i8) -> i32`
               found type `extern "C" fn(*mut libc::c_void, usize, *const i8, i32, *const i8) -> i32 {symbolize::libbacktrace::pcinfo_cb}`

error[E0308]: mismatched types
   --> /home/xiaoniu/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.12/src/symbolize/libbacktrace.rs:172:47
    |
172 |                                    pcinfo_cb, error_cb,
    |                                               ^^^^^^^^ expected enum `std::os::raw::c_void`, found enum `libc::c_void`
    |
    = note: expected type `extern "C" fn(*mut std::os::raw::c_void, *const i8, i32)`
               found type `extern "C" fn(*mut libc::c_void, *const i8, i32) {symbolize::libbacktrace::error_cb}`

[sfackler]

That seems like an issue with the backtrace crate, though I can't reproduce that issue: https://circleci.com/gh/sfackler/cargo-tree/50

[xiaoniu-578fa6bff964d005]

In your CI environment, you use image: rust:1.30.0 rather than rustc 1.31.0 which belong to 2018edition.

I searched for the error "expected enum std::os::raw::c_void, found enum libc::c_void", and found the issue is solved in rustc 1.32.0-nightly, according to rust-lang/rust#53856. So cargo +nightly install cargo-tree would do the trick.

[sfackler]

It looks like backtrace published a new release that may have fixed your issue. If not, I'd open an issue on its repository.