[INFO] crate rust-graph 0.0.3 is already in cache
[INFO] extracting crate rust-graph 0.0.3 into work/ex/beta-1.38-1/sources/1.37.0/reg/rust-graph/0.0.3
[INFO] extracting crate rust-graph 0.0.3 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/rust-graph/0.0.3
[INFO] validating manifest of rust-graph-0.0.3 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 rust-graph-0.0.3 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 rust-graph-0.0.3
[INFO] finished frobbing rust-graph-0.0.3
[INFO] frobbed toml for rust-graph-0.0.3 written to work/ex/beta-1.38-1/sources/1.37.0/reg/rust-graph/0.0.3/Cargo.toml
[INFO] started frobbing rust-graph-0.0.3
[INFO] finished frobbing rust-graph-0.0.3
[INFO] frobbed toml for rust-graph-0.0.3 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/rust-graph/0.0.3/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing rust-graph-0.0.3 against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/rust-graph/0.0.3:/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] b5d6b1690e7afda11cc4eeb6c9db730592c49c932b4376ea0dea43aa835cad34
[INFO] running `"docker" "start" "-a" "b5d6b1690e7afda11cc4eeb6c9db730592c49c932b4376ea0dea43aa835cad34"`
[INFO] [stderr]    Compiling rust-graph v0.0.3 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(collections)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused macro definition
[INFO] [stderr]    --> src/graph.rs:272:1
[INFO] [stderr]     |
[INFO] [stderr] 272 | / macro_rules! add_node (
[INFO] [stderr] 273 | |     ($m:ident, $adj:ident, $g:ident, $n:expr, $p:expr) => ({
[INFO] [stderr] 274 | |         if !$m.contains_key(&$n) {
[INFO] [stderr] 275 | |             $adj.insert($n, Vec::new());
[INFO] [stderr] ...   |
[INFO] [stderr] 286 | |     })
[INFO] [stderr] 287 | | );
[INFO] [stderr]     | |__^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_macros)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused macro definition
[INFO] [stderr]    --> src/graph.rs:289:1
[INFO] [stderr]     |
[INFO] [stderr] 289 | / macro_rules! add_edge (
[INFO] [stderr] 290 | |     ($em:ident, $nm: ident, $adj:ident, $g:ident, $f:expr, $t:expr,
[INFO] [stderr] 291 | |      $p:expr) => ({
[INFO] [stderr] 292 | |         if !$nm.contains_key(&$f) {
[INFO] [stderr] ...   |
[INFO] [stderr] 316 | |     })
[INFO] [stderr] 317 | | );
[INFO] [stderr]     | |__^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `push_all` found for type `&mut std::vec::Vec<T>` in the current scope
[INFO] [stderr]   --> src/disjoint_set.rs:34:15
[INFO] [stderr]    |
[INFO] [stderr] 34 |         x_set.push_all(&*y_set);
[INFO] [stderr]    |               ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0554, E0599.
[INFO] [stderr] For more information about an error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `rust-graph`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "b5d6b1690e7afda11cc4eeb6c9db730592c49c932b4376ea0dea43aa835cad34"`
[INFO] running `"docker" "rm" "-f" "b5d6b1690e7afda11cc4eeb6c9db730592c49c932b4376ea0dea43aa835cad34"`
[INFO] [stdout] b5d6b1690e7afda11cc4eeb6c9db730592c49c932b4376ea0dea43aa835cad34