[INFO] cloning repository https://github.com/mdu02/ferric-gb
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mdu02/ferric-gb" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmdu02%2Fferric-gb", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmdu02%2Fferric-gb'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d1ef738bd3ea7fd7cb254a33c547b150f1a35623
[INFO] testing mdu02/ferric-gb against master#d98a5da813da67eb189387b8ccfb73cf481275d8+rustflags=-Copt-level=3 for pr-138759-retry
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmdu02%2Fferric-gb" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/mdu02/ferric-gb
[INFO] finished tweaking git repo https://github.com/mdu02/ferric-gb
[INFO] tweaked toml for git repo https://github.com/mdu02/ferric-gb written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/mdu02/ferric-gb on toolchain d98a5da813da67eb189387b8ccfb73cf481275d8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d98a5da813da67eb189387b8ccfb73cf481275d8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/mdu02/ferric-gb already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d98a5da813da67eb189387b8ccfb73cf481275d8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d98a5da813da67eb189387b8ccfb73cf481275d8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d87824aec3633a7d72d7c1bb3f15689dda2536ec225d8ab3b1a1a0ab1f5e09f6
[INFO] running `Command { std: "docker" "start" "-a" "d87824aec3633a7d72d7c1bb3f15689dda2536ec225d8ab3b1a1a0ab1f5e09f6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d87824aec3633a7d72d7c1bb3f15689dda2536ec225d8ab3b1a1a0ab1f5e09f6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d87824aec3633a7d72d7c1bb3f15689dda2536ec225d8ab3b1a1a0ab1f5e09f6", kill_on_drop: false }`
[INFO] [stdout] d87824aec3633a7d72d7c1bb3f15689dda2536ec225d8ab3b1a1a0ab1f5e09f6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid -Copt-level=3" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d98a5da813da67eb189387b8ccfb73cf481275d8" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 14a4f6e55eea23458421682e10a076976570e29ebceed611641eb66408b53691
[INFO] running `Command { std: "docker" "start" "-a" "14a4f6e55eea23458421682e10a076976570e29ebceed611641eb66408b53691", kill_on_drop: false }`
[INFO] [stderr]    Compiling ferric-gb v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0499]: cannot borrow `*self` as mutable more than once at a time
[INFO] [stdout]    --> src/cpu.rs:314:43
[INFO] [stdout]     |
[INFO] [stdout] 314 |                 self.write_narrow_reg(ry, self.read_narrow_reg(rz));
[INFO] [stdout]     |                 ---- ----------------     ^^^^ second mutable borrow occurs here
[INFO] [stdout]     |                 |    |
[INFO] [stdout]     |                 |    first borrow later used by call
[INFO] [stdout]     |                 first mutable borrow occurs here
[INFO] [stdout]     |
[INFO] [stdout] help: try adding a local storing this argument...
[INFO] [stdout]    --> src/cpu.rs:314:43
[INFO] [stdout]     |
[INFO] [stdout] 314 |                 self.write_narrow_reg(ry, self.read_narrow_reg(rz));
[INFO] [stdout]     |                                           ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] help: ...and then using that local as the argument to this call
[INFO] [stdout]    --> src/cpu.rs:314:17
[INFO] [stdout]     |
[INFO] [stdout] 314 |                 self.write_narrow_reg(ry, self.read_narrow_reg(rz));
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/ram.rs:10:13
[INFO] [stdout]    |
[INFO] [stdout] 10 |         let mut ram = RAM {
[INFO] [stdout]    |             ----^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/register.rs:10:13
[INFO] [stdout]    |
[INFO] [stdout] 10 |         let mut reg: Register = Register { value };
[INFO] [stdout]    |             ----^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0499`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ferric-gb` (bin "ferric-gb") due to 1 previous error; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "14a4f6e55eea23458421682e10a076976570e29ebceed611641eb66408b53691", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "14a4f6e55eea23458421682e10a076976570e29ebceed611641eb66408b53691", kill_on_drop: false }`
[INFO] [stdout] 14a4f6e55eea23458421682e10a076976570e29ebceed611641eb66408b53691