[INFO] updating cached repository https://github.com/jamesmunns/deser_n
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 3a79f2b4a0c6a26dd44a802f2c5f69b78dc04c62
[INFO] testing jamesmunns/deser_n against beta-2019-09-28 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjamesmunns%2Fdeser_n" "work/builds/worker-6/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jamesmunns/deser_n on toolchain beta-2019-09-28
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/jamesmunns/deser_n
[INFO] finished tweaking git repo https://github.com/jamesmunns/deser_n
[INFO] tweaked toml for git repo https://github.com/jamesmunns/deser_n written to work/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/jamesmunns/deser_n already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-6/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "build" "--frozen"`
[INFO] [stdout] d2b0d6a876969e943c7e4ae4f36c13c31354f507eb3fd5dc55f5236e33f5b883
[INFO] running `"docker" "start" "-a" "d2b0d6a876969e943c7e4ae4f36c13c31354f507eb3fd5dc55f5236e33f5b883"`
[INFO] [stderr]    Compiling deser_n v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0599]: no method named `len` found for type `T` in the current scope
[INFO] [stderr]   --> src/main.rs:62:43
[INFO] [stderr]    |
[INFO] [stderr] 62 |             if b as usize <= self.rawdata.len() {
[INFO] [stderr]    |                                           ^^^ method not found in `T`
[INFO] [stderr]    |
[INFO] [stderr]    = help: items from traits can only be used if the type parameter is bounded by the trait
[INFO] [stderr] help: the following trait defines an item `len`, perhaps you need to restrict type parameter `T` with it:
[INFO] [stderr]    |
[INFO] [stderr] 57 | impl<T: std::iter::ExactSizeIterator> Field<T> {
[INFO] [stderr]    |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0608]: cannot index into a value of type `T`
[INFO] [stderr]   --> src/main.rs:71:9
[INFO] [stderr]    |
[INFO] [stderr] 71 |         self.rawdata[self.cursize as usize] = b;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0599, E0608.
[INFO] [stderr] For more information about an error, try `rustc --explain E0599`.
[INFO] [stderr] error: could not compile `deser_n`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "d2b0d6a876969e943c7e4ae4f36c13c31354f507eb3fd5dc55f5236e33f5b883"`
[INFO] running `"docker" "rm" "-f" "d2b0d6a876969e943c7e4ae4f36c13c31354f507eb3fd5dc55f5236e33f5b883"`
[INFO] [stdout] d2b0d6a876969e943c7e4ae4f36c13c31354f507eb3fd5dc55f5236e33f5b883