[INFO] cloning repository https://github.com/dhoepelman/rust-pong [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/dhoepelman/rust-pong" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdhoepelman%2Frust-pong", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdhoepelman%2Frust-pong'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] c137445cb4b13ef72b217eb3bb5075ee9e1d1ecc [INFO] checking dhoepelman/rust-pong/c137445cb4b13ef72b217eb3bb5075ee9e1d1ecc against master#ff1737bb00913444173658b4e0b274fd79aabf66 for pr-132712-1 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdhoepelman%2Frust-pong" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/dhoepelman/rust-pong on toolchain ff1737bb00913444173658b4e0b274fd79aabf66 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ff1737bb00913444173658b4e0b274fd79aabf66" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/dhoepelman/rust-pong [INFO] finished tweaking git repo https://github.com/dhoepelman/rust-pong [INFO] tweaked toml for git repo https://github.com/dhoepelman/rust-pong written to /workspace/builds/worker-4-tc1/source/Cargo.toml [INFO] crate git repo https://github.com/dhoepelman/rust-pong 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" "+ff1737bb00913444173658b4e0b274fd79aabf66" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [INFO] [stderr] Downloading crates ... [INFO] [stderr] Downloaded rand_core v0.4.0 [INFO] [stderr] Downloaded fuchsia-cprng v0.1.0 [INFO] [stderr] Downloaded rug v0.6.0 [INFO] [stderr] Downloaded libc v0.2.48 [INFO] [stderr] Downloaded gmp-mpfr-sys v1.1.10 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:4a844ea9eb2546a2d2c7022eacef16ef2e8229c7fbb2c7d4d55a9ceca922f72d" "/opt/rustwide/cargo-home/bin/cargo" "+ff1737bb00913444173658b4e0b274fd79aabf66" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 17824d6e435b9e0b0ece840934decea9d45554fb508997385336860970e56996 [INFO] running `Command { std: "docker" "start" "-a" "17824d6e435b9e0b0ece840934decea9d45554fb508997385336860970e56996", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "17824d6e435b9e0b0ece840934decea9d45554fb508997385336860970e56996", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "17824d6e435b9e0b0ece840934decea9d45554fb508997385336860970e56996", kill_on_drop: false }` [INFO] [stdout] 17824d6e435b9e0b0ece840934decea9d45554fb508997385336860970e56996 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=allow" "-e" "RUSTDOCFLAGS=--cap-lints=allow" "-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@sha256:4a844ea9eb2546a2d2c7022eacef16ef2e8229c7fbb2c7d4d55a9ceca922f72d" "/opt/rustwide/cargo-home/bin/cargo" "+ff1737bb00913444173658b4e0b274fd79aabf66" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 271e93b9288cb2cf9563895ec953fbdca2e4152dffee23d382eec7451aa1070e [INFO] running `Command { std: "docker" "start" "-a" "271e93b9288cb2cf9563895ec953fbdca2e4152dffee23d382eec7451aa1070e", kill_on_drop: false }` [INFO] [stderr] Compiling libc v0.2.48 [INFO] [stderr] Compiling gmp-mpfr-sys v1.1.10 [INFO] [stderr] Compiling rug v0.6.0 [INFO] [stderr] Checking rand v0.4.6 [INFO] [stderr] Checking pong v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] error[E0502]: cannot borrow `*cache` as mutable because it is also borrowed as immutable [INFO] [stdout] --> src/main.rs:57:22 [INFO] [stdout] | [INFO] [stdout] 50 | fn fib(n: usize, cache: &mut Vec) -> &Integer { [INFO] [stdout] | - let's call the lifetime of this reference `'1` [INFO] [stdout] 51 | match cache.get(n) { [INFO] [stdout] | ----- immutable borrow occurs here [INFO] [stdout] 52 | Some(n) => n, [INFO] [stdout] | - returning this value requires that `*cache` is borrowed for `'1` [INFO] [stdout] ... [INFO] [stdout] 57 | m => fib(m-2, cache).clone() + fib(m - 1, cache).clone() [INFO] [stdout] | ^^^^^^^^^^^^^^^ mutable borrow occurs here [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0502]: cannot borrow `*cache` as mutable because it is also borrowed as immutable [INFO] [stdout] --> src/main.rs:57:22 [INFO] [stdout] | [INFO] [stdout] 50 | fn fib(n: usize, cache: &mut Vec) -> &Integer { [INFO] [stdout] | - let's call the lifetime of this reference `'1` [INFO] [stdout] 51 | match cache.get(n) { [INFO] [stdout] | ----- immutable borrow occurs here [INFO] [stdout] 52 | Some(n) => n, [INFO] [stdout] | - returning this value requires that `*cache` is borrowed for `'1` [INFO] [stdout] ... [INFO] [stdout] 57 | m => fib(m-2, cache).clone() + fib(m - 1, cache).clone() [INFO] [stdout] | ^^^^^^^^^^^^^^^ mutable borrow occurs here [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0502]: cannot borrow `*cache` as mutable because it is also borrowed as immutable [INFO] [stdout] --> src/main.rs:57:48 [INFO] [stdout] | [INFO] [stdout] 50 | fn fib(n: usize, cache: &mut Vec) -> &Integer { [INFO] [stdout] | - let's call the lifetime of this reference `'1` [INFO] [stdout] 51 | match cache.get(n) { [INFO] [stdout] | ----- immutable borrow occurs here [INFO] [stdout] 52 | Some(n) => n, [INFO] [stdout] | - returning this value requires that `*cache` is borrowed for `'1` [INFO] [stdout] ... [INFO] [stdout] 57 | m => fib(m-2, cache).clone() + fib(m - 1, cache).clone() [INFO] [stdout] | ^^^^^^^^^^^^^^^^^ mutable borrow occurs here [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0502]: cannot borrow `*cache` as mutable because it is also borrowed as immutable [INFO] [stdout] --> src/main.rs:57:48 [INFO] [stdout] | [INFO] [stdout] 50 | fn fib(n: usize, cache: &mut Vec) -> &Integer { [INFO] [stdout] | - let's call the lifetime of this reference `'1` [INFO] [stdout] 51 | match cache.get(n) { [INFO] [stdout] | ----- immutable borrow occurs here [INFO] [stdout] 52 | Some(n) => n, [INFO] [stdout] | - returning this value requires that `*cache` is borrowed for `'1` [INFO] [stdout] ... [INFO] [stdout] 57 | m => fib(m-2, cache).clone() + fib(m - 1, cache).clone() [INFO] [stdout] | ^^^^^^^^^^^^^^^^^ mutable borrow occurs here [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0502]: cannot borrow `*cache` as mutable because it is also borrowed as immutable [INFO] [stdout] --> src/main.rs:59:13 [INFO] [stdout] | [INFO] [stdout] 50 | fn fib(n: usize, cache: &mut Vec) -> &Integer { [INFO] [stdout] | - let's call the lifetime of this reference `'1` [INFO] [stdout] 51 | match cache.get(n) { [INFO] [stdout] | ----- immutable borrow occurs here [INFO] [stdout] 52 | Some(n) => n, [INFO] [stdout] | - returning this value requires that `*cache` is borrowed for `'1` [INFO] [stdout] ... [INFO] [stdout] 59 | cache.push(res); [INFO] [stdout] | ^^^^^^^^^^^^^^^ mutable borrow occurs here [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0502]: cannot borrow `*cache` as mutable because it is also borrowed as immutable [INFO] [stdout] --> src/main.rs:59:13 [INFO] [stdout] | [INFO] [stdout] 50 | fn fib(n: usize, cache: &mut Vec) -> &Integer { [INFO] [stdout] | - let's call the lifetime of this reference `'1` [INFO] [stdout] 51 | match cache.get(n) { [INFO] [stdout] | ----- immutable borrow occurs here [INFO] [stdout] 52 | Some(n) => n, [INFO] [stdout] | - returning this value requires that `*cache` is borrowed for `'1` [INFO] [stdout] ... [INFO] [stdout] 59 | cache.push(res); [INFO] [stdout] | ^^^^^^^^^^^^^^^ mutable borrow occurs here [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0515]: cannot return reference to temporary value [INFO] [stdout] --> src/main.rs:60:20 [INFO] [stdout] | [INFO] [stdout] 60 | return &cache[n].clone(); [INFO] [stdout] | ^---------------- [INFO] [stdout] | || [INFO] [stdout] | |temporary value created here [INFO] [stdout] | returns a reference to data owned by the current function [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0515]: cannot return reference to temporary value [INFO] [stdout] --> src/main.rs:60:20 [INFO] [stdout] | [INFO] [stdout] 60 | return &cache[n].clone(); [INFO] [stdout] | ^---------------- [INFO] [stdout] | || [INFO] [stdout] | |temporary value created here [INFO] [stdout] | returns a reference to data owned by the current function [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] Some errors have detailed explanations: E0502, E0515. [INFO] [stdout] [INFO] [stdout] For more information about an error, try `rustc --explain E0502`. [INFO] [stdout] [INFO] [stdout] Some errors have detailed explanations: E0502, E0515. [INFO] [stdout] [INFO] [stdout] For more information about an error, try `rustc --explain E0502`. [INFO] [stdout] [INFO] [stderr] error: could not compile `pong` (bin "pong" test) due to 4 previous errors [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] [stderr] error: could not compile `pong` (bin "pong") due to 4 previous errors [INFO] running `Command { std: "docker" "inspect" "271e93b9288cb2cf9563895ec953fbdca2e4152dffee23d382eec7451aa1070e", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "271e93b9288cb2cf9563895ec953fbdca2e4152dffee23d382eec7451aa1070e", kill_on_drop: false }` [INFO] [stdout] 271e93b9288cb2cf9563895ec953fbdca2e4152dffee23d382eec7451aa1070e