[INFO] updating cached repository jamesmunns/deser_n
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/jamesmunns/deser_n
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/jamesmunns/deser_n" "work/ex/beta-1.38-1/sources/1.37.0/gh/jamesmunns/deser_n"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/jamesmunns/deser_n'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/jamesmunns/deser_n" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jamesmunns/deser_n"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jamesmunns/deser_n'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 3a79f2b4a0c6a26dd44a802f2c5f69b78dc04c62
[INFO] sha for GitHub repo jamesmunns/deser_n: 3a79f2b4a0c6a26dd44a802f2c5f69b78dc04c62
[INFO] validating manifest of jamesmunns/deser_n on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of jamesmunns/deser_n on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing jamesmunns/deser_n
[INFO] finished frobbing jamesmunns/deser_n
[INFO] frobbed toml for jamesmunns/deser_n written to work/ex/beta-1.38-1/sources/1.37.0/gh/jamesmunns/deser_n/Cargo.toml
[INFO] started frobbing jamesmunns/deser_n
[INFO] finished frobbing jamesmunns/deser_n
[INFO] frobbed toml for jamesmunns/deser_n written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jamesmunns/deser_n/Cargo.toml
[INFO] crate jamesmunns/deser_n already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "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" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing jamesmunns/deser_n against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/jamesmunns/deser_n:/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=warn" "-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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] efbc9457085c37669db8778cbdec7428000a4f22a38a97bfaed7fb5ab7ceba55
[INFO] running `"docker" "start" "-a" "efbc9457085c37669db8778cbdec7428000a4f22a38a97bfaed7fb5ab7ceba55"`
[INFO] [stderr]    Compiling deser_n v0.1.0 (/opt/crater/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]    |                                           ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stderr]    = note: the following trait defines an item `len`, perhaps you need to implement it:
[INFO] [stderr]            candidate #1: `std::iter::ExactSizeIterator`
[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" "efbc9457085c37669db8778cbdec7428000a4f22a38a97bfaed7fb5ab7ceba55"`
[INFO] running `"docker" "rm" "-f" "efbc9457085c37669db8778cbdec7428000a4f22a38a97bfaed7fb5ab7ceba55"`
[INFO] [stdout] efbc9457085c37669db8778cbdec7428000a4f22a38a97bfaed7fb5ab7ceba55