[INFO] updating cached repository https://github.com/jharrilim/rustler
[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] 906dba56401c076217b5a994652cb4aa0e6a616e
[INFO] testing jharrilim/rustler against beta-2019-09-28 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjharrilim%2Frustler" "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/jharrilim/rustler 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/jharrilim/rustler
[INFO] finished tweaking git repo https://github.com/jharrilim/rustler
[INFO] tweaked toml for git repo https://github.com/jharrilim/rustler written to work/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/jharrilim/rustler 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] 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] 41644bef607b553c3e13163c49ae3c78524aa138671989800cb887ddd0b0b7e7
[INFO] running `"docker" "start" "-a" "41644bef607b553c3e13163c49ae3c78524aa138671989800cb887ddd0b0b7e7"`
[INFO] [stderr]    Compiling rustler v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused imports: `IpAddr`, `TcpStream`
[INFO] [stderr]  --> src/http/request.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     IpAddr,
[INFO] [stderr]   |     ^^^^^^
[INFO] [stderr] 6 |     TcpStream,
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::net::TcpStream`
[INFO] [stderr]  --> src/http/client.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::net::TcpStream;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `add` found for type `std::string::String` in the current scope
[INFO] [stderr]   --> src/http/request.rs:32:23
[INFO] [stderr]    |
[INFO] [stderr] 32 |             msg = msg.add(format!("{}:{}\r\n", k, v).as_str())
[INFO] [stderr]    |                       ^^^ method not found in `std::string::String`
[INFO] [stderr]    |
[INFO] [stderr]    = help: items from traits can only be used if the trait is in scope
[INFO] [stderr]    = note: the following trait is implemented but not in scope, perhaps add a `use` for it:
[INFO] [stderr]            `use std::ops::Add;`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `add` found for type `std::string::String` in the current scope
[INFO] [stderr]   --> src/http/request.rs:34:19
[INFO] [stderr]    |
[INFO] [stderr] 34 |         msg = msg.add(self.body.as_str());
[INFO] [stderr]    |                   ^^^ method not found in `std::string::String`
[INFO] [stderr]    |
[INFO] [stderr]    = help: items from traits can only be used if the trait is in scope
[INFO] [stderr]    = note: the following trait is implemented but not in scope, perhaps add a `use` for it:
[INFO] [stderr]            `use std::ops::Add;`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0599`.
[INFO] [stderr] error: could not compile `rustler`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "41644bef607b553c3e13163c49ae3c78524aa138671989800cb887ddd0b0b7e7"`
[INFO] running `"docker" "rm" "-f" "41644bef607b553c3e13163c49ae3c78524aa138671989800cb887ddd0b0b7e7"`
[INFO] [stdout] 41644bef607b553c3e13163c49ae3c78524aa138671989800cb887ddd0b0b7e7