[INFO] updating cached repository davesabra/Mandelbrot-set-graphic-by-Rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/davesabra/Mandelbrot-set-graphic-by-Rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/davesabra/Mandelbrot-set-graphic-by-Rust" "work/ex/beta-1.38-1/sources/1.37.0/gh/davesabra/Mandelbrot-set-graphic-by-Rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/davesabra/Mandelbrot-set-graphic-by-Rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/davesabra/Mandelbrot-set-graphic-by-Rust" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/davesabra/Mandelbrot-set-graphic-by-Rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/davesabra/Mandelbrot-set-graphic-by-Rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] fcc3883aa54fa7b12302ffda3d88f0949b6e1959
[INFO] sha for GitHub repo davesabra/Mandelbrot-set-graphic-by-Rust: fcc3883aa54fa7b12302ffda3d88f0949b6e1959
[INFO] validating manifest of davesabra/Mandelbrot-set-graphic-by-Rust 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 davesabra/Mandelbrot-set-graphic-by-Rust 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 davesabra/Mandelbrot-set-graphic-by-Rust
[INFO] finished frobbing davesabra/Mandelbrot-set-graphic-by-Rust
[INFO] frobbed toml for davesabra/Mandelbrot-set-graphic-by-Rust written to work/ex/beta-1.38-1/sources/1.37.0/gh/davesabra/Mandelbrot-set-graphic-by-Rust/Cargo.toml
[INFO] started frobbing davesabra/Mandelbrot-set-graphic-by-Rust
[INFO] finished frobbing davesabra/Mandelbrot-set-graphic-by-Rust
[INFO] frobbed toml for davesabra/Mandelbrot-set-graphic-by-Rust written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/davesabra/Mandelbrot-set-graphic-by-Rust/Cargo.toml
[INFO] crate davesabra/Mandelbrot-set-graphic-by-Rust 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 davesabra/Mandelbrot-set-graphic-by-Rust 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-1/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/davesabra/Mandelbrot-set-graphic-by-Rust:/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] f5d21445f59b7fcae690381780be34b1ebcf6e65de2932be81907a8457a7dccd
[INFO] running `"docker" "start" "-a" "f5d21445f59b7fcae690381780be34b1ebcf6e65de2932be81907a8457a7dccd"`
[INFO] [stderr]    Compiling syn v0.15.33
[INFO] [stderr]    Compiling num_cpus v1.10.0
[INFO] [stderr]    Compiling num-bigint v0.2.2
[INFO] [stderr]    Compiling png v0.14.1
[INFO] [stderr]    Compiling crossbeam v0.7.1
[INFO] [stderr]    Compiling rayon-core v1.4.1
[INFO] [stderr]    Compiling rayon v1.0.3
[INFO] [stderr]    Compiling num-rational v0.2.1
[INFO] [stderr]    Compiling num v0.2.0
[INFO] [stderr]    Compiling jpeg-decoder v0.1.15
[INFO] [stderr]    Compiling num-derive v0.2.5
[INFO] [stderr]    Compiling tiff v0.2.2
[INFO] [stderr]    Compiling image v0.21.1
[INFO] [stderr]    Compiling mandelbrot v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0599]: no method named `write_fmt` found for type `std::io::Stderr` in the current scope
[INFO] [stderr]    --> src/main.rs:140:9
[INFO] [stderr]     |
[INFO] [stderr] 140 | /         writeln!(
[INFO] [stderr] 141 | |             std::io::stderr(),
[INFO] [stderr] 142 | |             "Usage:    mandelbrot FILE    PIXELS UPPERLEFT LOWERRIGHT"
[INFO] [stderr] 143 | |         )
[INFO] [stderr]     | |_________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: items from traits can only be used if the trait is in scope
[INFO] [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] help: the following trait is implemented but not in scope, perhaps add a `use` for it:
[INFO] [stderr]     |
[INFO] [stderr] 2   | use std::io::Write;
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `write_fmt` found for type `std::io::Stderr` in the current scope
[INFO] [stderr]    --> src/main.rs:145:9
[INFO] [stderr]     |
[INFO] [stderr] 145 | /         writeln!(
[INFO] [stderr] 146 | |             std::io::stderr(),
[INFO] [stderr] 147 | |             "Example: {} mandel.png    1000x750 -1.20,0.35    -1,0.20",
[INFO] [stderr] 148 | |             args[0]
[INFO] [stderr] 149 | |         )
[INFO] [stderr]     | |_________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: items from traits can only be used if the trait is in scope
[INFO] [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] help: the following trait is implemented but not in scope, perhaps add a `use` for it:
[INFO] [stderr]     |
[INFO] [stderr] 2   | use std::io::Write;
[INFO] [stderr]     |
[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 `mandelbrot`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "f5d21445f59b7fcae690381780be34b1ebcf6e65de2932be81907a8457a7dccd"`
[INFO] running `"docker" "rm" "-f" "f5d21445f59b7fcae690381780be34b1ebcf6e65de2932be81907a8457a7dccd"`
[INFO] [stdout] f5d21445f59b7fcae690381780be34b1ebcf6e65de2932be81907a8457a7dccd