[INFO] updating cached repository Geal/rust-wasm-canvas
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Geal/rust-wasm-canvas
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Geal/rust-wasm-canvas" "work/ex/beta-1.38-1/sources/1.37.0/gh/Geal/rust-wasm-canvas"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Geal/rust-wasm-canvas'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Geal/rust-wasm-canvas" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Geal/rust-wasm-canvas"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Geal/rust-wasm-canvas'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 261a24794b5b2436daf66fe1a4fa71a8998b55d3
[INFO] sha for GitHub repo Geal/rust-wasm-canvas: 261a24794b5b2436daf66fe1a4fa71a8998b55d3
[INFO] validating manifest of Geal/rust-wasm-canvas 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 Geal/rust-wasm-canvas 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 Geal/rust-wasm-canvas
[INFO] finished frobbing Geal/rust-wasm-canvas
[INFO] frobbed toml for Geal/rust-wasm-canvas written to work/ex/beta-1.38-1/sources/1.37.0/gh/Geal/rust-wasm-canvas/Cargo.toml
[INFO] started frobbing Geal/rust-wasm-canvas
[INFO] finished frobbing Geal/rust-wasm-canvas
[INFO] frobbed toml for Geal/rust-wasm-canvas written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Geal/rust-wasm-canvas/Cargo.toml
[INFO] crate Geal/rust-wasm-canvas 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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing Geal/rust-wasm-canvas 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-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/Geal/rust-wasm-canvas:/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] 6bad3dcba2545b9e27d7c5570a43e742f49f9c5cf00bbb81a84e975cda377f02
[INFO] running `"docker" "start" "-a" "6bad3dcba2545b9e27d7c5570a43e742f49f9c5cf00bbb81a84e975cda377f02"`
[INFO] [stderr]    Compiling rust-wasm-canvas v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0432]: unresolved import `std::heap`
[INFO] [stderr]  --> src/main.rs:3:10
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::heap::{Alloc, Heap, Layout};
[INFO] [stderr]   |          ^^^^ could not find `heap` in `std`
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(allocator_api)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::iter::repeat`
[INFO] [stderr]  --> src/main.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::iter::repeat;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0432, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0432`.
[INFO] [stderr] error: Could not compile `rust-wasm-canvas`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "6bad3dcba2545b9e27d7c5570a43e742f49f9c5cf00bbb81a84e975cda377f02"`
[INFO] running `"docker" "rm" "-f" "6bad3dcba2545b9e27d7c5570a43e742f49f9c5cf00bbb81a84e975cda377f02"`
[INFO] [stdout] 6bad3dcba2545b9e27d7c5570a43e742f49f9c5cf00bbb81a84e975cda377f02