[INFO] updating cached repository cheme/tunnel
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/cheme/tunnel
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/cheme/tunnel" "work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/gh/cheme/tunnel"`
[INFO] [stderr] Cloning into 'work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/gh/cheme/tunnel'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/cheme/tunnel" "work/ex/pr-63565/sources/try#75eff020d0923c035c2fe220db4a0465cd847048/gh/cheme/tunnel"`
[INFO] [stderr] Cloning into 'work/ex/pr-63565/sources/try#75eff020d0923c035c2fe220db4a0465cd847048/gh/cheme/tunnel'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c695e507295424520f56d62841574c321ccb8cea
[INFO] sha for GitHub repo cheme/tunnel: c695e507295424520f56d62841574c321ccb8cea
[INFO] validating manifest of cheme/tunnel on toolchain master#c43d03a19f326f4a323569328cc501e86eb6d22e
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c43d03a19f326f4a323569328cc501e86eb6d22e-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of cheme/tunnel on toolchain try#75eff020d0923c035c2fe220db4a0465cd847048
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+75eff020d0923c035c2fe220db4a0465cd847048-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing cheme/tunnel
[INFO] finished frobbing cheme/tunnel
[INFO] frobbed toml for cheme/tunnel written to work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/gh/cheme/tunnel/Cargo.toml
[INFO] started frobbing cheme/tunnel
[INFO] finished frobbing cheme/tunnel
[INFO] frobbed toml for cheme/tunnel written to work/ex/pr-63565/sources/try#75eff020d0923c035c2fe220db4a0465cd847048/gh/cheme/tunnel/Cargo.toml
[INFO] crate cheme/tunnel already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c43d03a19f326f4a323569328cc501e86eb6d22e-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+75eff020d0923c035c2fe220db4a0465cd847048-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking cheme/tunnel against master#c43d03a19f326f4a323569328cc501e86eb6d22e for pr-63565
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63565/worker-5/master#c43d03a19f326f4a323569328cc501e86eb6d22e:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/gh/cheme/tunnel:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+c43d03a19f326f4a323569328cc501e86eb6d22e-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 01ee8d44d31c931cfb5b06be398d70f8fe9eb6d437f100f281652c98c39f719d
[INFO] running `"docker" "start" "-a" "01ee8d44d31c931cfb5b06be398d70f8fe9eb6d437f100f281652c98c39f719d"`
[INFO] [stderr]     Checking smallvec v0.6.0
[INFO] [stderr]     Checking itoa v0.4.0
[INFO] [stderr]     Checking serde v1.0.33
[INFO] [stderr]     Checking bit-vec v0.4.1 (https://github.com/cheme/bit-vec.git#084e672d)
[INFO] [stderr]     Checking uuid v0.6.1
[INFO] [stderr]     Checking readwrite-comp v0.0.1 (https://github.com/cheme/readwrite-comp.git#a7dd09c9)
[INFO] [stderr]    Compiling context v1.0.1
[INFO] [stderr]     Checking net2 v0.2.32
[INFO] [stderr] warning[E0713]: borrow may still be in use when destructor runs
[INFO] [stderr]    --> /opt/crater/cargo-home/git/checkouts/readwrite-comp-98a72d5ffd3148ea/a7dd09c/readwrite-comp/src/lib.rs:369:9
[INFO] [stderr]     |
[INFO] [stderr] 353 | impl<'a, 'b, W : 'a + Write, EW : 'b + ExtWrite> CompW<'a,'b,W,EW> {
[INFO] [stderr]     |          -- lifetime `'b` defined here
[INFO] [stderr] ...
[INFO] [stderr] 369 |     Ok((self.1,self.2.clone()))
[INFO] [stderr]     |     ----^^^^^^----------------- returning this value requires that `*self.1` is borrowed for `'b`
[INFO] [stderr] 370 |   }
[INFO] [stderr]     |   - here, drop of `self` needs exclusive access to `*self.1`, because the type `CompW<'_, '_, W, EW>` implements the `Drop` trait
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this error has been downgraded to a warning for backwards compatibility with previous releases
[INFO] [stderr]     = warning: this represents potential undefined behavior in your code and this warning will become a hard error in the future
[INFO] [stderr]     = note: for more information, try `rustc --explain E0729`
[INFO] [stderr] 
[INFO] [stderr] warning[E0713]: borrow may still be in use when destructor runs
[INFO] [stderr]    --> /opt/crater/cargo-home/git/checkouts/readwrite-comp-98a72d5ffd3148ea/a7dd09c/readwrite-comp/src/lib.rs:436:9
[INFO] [stderr]     |
[INFO] [stderr] 422 | impl<'a, 'b, R : 'a + Read, ER : 'b + ExtRead> CompR<'a,'b,R,ER> {
[INFO] [stderr]     |          -- lifetime `'b` defined here
[INFO] [stderr] ...
[INFO] [stderr] 436 |     Ok((self.1,self.2.clone()))
[INFO] [stderr]     |     ----^^^^^^----------------- returning this value requires that `*self.1` is borrowed for `'b`
[INFO] [stderr] 437 |   }
[INFO] [stderr]     |   - here, drop of `self` needs exclusive access to `*self.1`, because the type `CompR<'_, '_, R, ER>` implements the `Drop` trait
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this error has been downgraded to a warning for backwards compatibility with previous releases
[INFO] [stderr]     = warning: this represents potential undefined behavior in your code and this warning will become a hard error in the future
[INFO] [stderr]     = note: for more information, try `rustc --explain E0729`
[INFO] [stderr] 
[INFO] [stderr]     Checking time v0.1.39
[INFO] [stderr]     Checking futures-cpupool v0.1.8
[INFO] [stderr]     Checking readwrite-comp-test v0.0.1 (https://github.com/cheme/readwrite-comp.git#a7dd09c9)
[INFO] [stderr]     Checking mio v0.6.14
[INFO] [stderr]    Compiling serde_derive_internals v0.21.0
[INFO] [stderr]     Checking parking_lot_core v0.2.13
[INFO] [stderr]     Checking sized_windows_lim v0.0.1 (https://github.com/cheme/readwrite-comp.git#a7dd09c9)
[INFO] [stderr]     Checking coroutine v0.8.0
[INFO] [stderr]     Checking parking_lot v0.4.8
[INFO] [stderr] error[E0432]: unresolved import `std::boxed::FnBox`
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/coroutine-0.8.0/src/asymmetric.rs:25:5
[INFO] [stderr]    |
[INFO] [stderr] 25 | use std::boxed::FnBox;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^ no `FnBox` in `boxed`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0432`.
[INFO] [stderr] error: Could not compile `coroutine`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "01ee8d44d31c931cfb5b06be398d70f8fe9eb6d437f100f281652c98c39f719d"`
[INFO] running `"docker" "rm" "-f" "01ee8d44d31c931cfb5b06be398d70f8fe9eb6d437f100f281652c98c39f719d"`
[INFO] [stdout] 01ee8d44d31c931cfb5b06be398d70f8fe9eb6d437f100f281652c98c39f719d