[INFO] cloning repository https://github.com/kvnvelasco/learning-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kvnvelasco/learning-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkvnvelasco%2Flearning-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkvnvelasco%2Flearning-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 32d9d127a88eefcdd05e9dc50cb90d8a29d217cd
[INFO] testing kvnvelasco/learning-rust 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%2Fkvnvelasco%2Flearning-rust" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/kvnvelasco/learning-rust
[INFO] finished tweaking git repo https://github.com/kvnvelasco/learning-rust
[INFO] tweaked toml for git repo https://github.com/kvnvelasco/learning-rust written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/kvnvelasco/learning-rust 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/kvnvelasco/learning-rust 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] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded futures-task v0.3.4
[INFO] [stderr]   Downloaded futures v0.3.4
[INFO] [stderr]   Downloaded proc-macro-nested v0.1.4
[INFO] [stderr]   Downloaded memchr v2.3.3
[INFO] [stderr]   Downloaded proc-macro-hack v0.5.15
[INFO] [stderr]   Downloaded net2 v0.2.33
[INFO] [stderr]   Downloaded fuchsia-zircon-sys v0.3.3
[INFO] [stderr]   Downloaded winapi-build v0.1.1
[INFO] [stderr]   Downloaded slab v0.4.2
[INFO] [stderr]   Downloaded iovec v0.1.4
[INFO] [stderr]   Downloaded tokio-macros v0.2.5
[INFO] [stderr]   Downloaded ws2_32-sys v0.2.1
[INFO] [stderr]   Downloaded cfg-if v0.1.10
[INFO] [stderr]   Downloaded redox_syscall v0.1.56
[INFO] [stderr]   Downloaded mio-named-pipes v0.1.6
[INFO] [stderr]   Downloaded bytes v0.5.4
[INFO] [stderr]   Downloaded pin-project-lite v0.1.4
[INFO] [stderr]   Downloaded futures-channel v0.3.4
[INFO] [stderr]   Downloaded futures-util v0.3.4
[INFO] [stderr]   Downloaded futures-core v0.3.4
[INFO] [stderr]   Downloaded proc-macro2 v1.0.10
[INFO] [stderr]   Downloaded fnv v1.0.6
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[INFO] [stderr]   Downloaded syn v1.0.17
[INFO] [stderr]   Downloaded miow v0.3.3
[INFO] [stderr]   Downloaded bitflags v1.2.1
[INFO] [stderr]   Downloaded mio v0.6.21
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[INFO] [stderr]   Downloaded tokio v0.2.16
[INFO] [stderr]   Downloaded libc v0.2.68
[INFO] [stderr]   Downloaded kernel32-sys v0.2.2
[INFO] [stderr]   Downloaded hermit-abi v0.1.10
[INFO] [stderr]   Downloaded num_cpus v1.12.0
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[INFO] [stderr]   Downloaded signal-hook-registry v1.2.0
[INFO] [stderr]   Downloaded quote v1.0.3
[INFO] [stderr]   Downloaded unicode-xid v0.2.0
[INFO] [stderr]   Downloaded futures-macro v0.3.4
[INFO] [stderr]   Downloaded futures-sink v0.3.4
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[INFO] [stderr]   Downloaded fuchsia-zircon v0.3.3
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 734ffe786755550bab11795c7aafc69a07fb71cb4cea4dcbe5dd287aed7dd73a
[INFO] running `Command { std: "docker" "start" "-a" "734ffe786755550bab11795c7aafc69a07fb71cb4cea4dcbe5dd287aed7dd73a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "734ffe786755550bab11795c7aafc69a07fb71cb4cea4dcbe5dd287aed7dd73a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "734ffe786755550bab11795c7aafc69a07fb71cb4cea4dcbe5dd287aed7dd73a", kill_on_drop: false }`
[INFO] [stdout] 734ffe786755550bab11795c7aafc69a07fb71cb4cea4dcbe5dd287aed7dd73a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 9398236b9342bbecb56d5fc7cf0005d0a24dd259f0a41cc53726478f13924880
[INFO] running `Command { std: "docker" "start" "-a" "9398236b9342bbecb56d5fc7cf0005d0a24dd259f0a41cc53726478f13924880", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.10
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling libc v0.2.68
[INFO] [stderr]    Compiling syn v1.0.17
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling slab v0.4.2
[INFO] [stderr]    Compiling futures-core v0.3.4
[INFO] [stderr]    Compiling proc-macro-nested v0.1.4
[INFO] [stderr]    Compiling cfg-if v0.1.10
[INFO] [stderr]    Compiling futures-sink v0.3.4
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling proc-macro-hack v0.5.15
[INFO] [stderr]    Compiling pin-utils v0.1.0-alpha.4
[INFO] [stderr]    Compiling futures-task v0.3.4
[INFO] [stderr]    Compiling futures-io v0.3.4
[INFO] [stderr]    Compiling httparse v1.3.4
[INFO] [stderr]    Compiling arc-swap v0.4.5
[INFO] [stderr]    Compiling pin-project-lite v0.1.4
[INFO] [stderr]    Compiling fnv v1.0.6
[INFO] [stderr]    Compiling bytes v0.5.4
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling syscalls v0.1.0 (/opt/rustwide/workdir/syscalls)
[INFO] [stderr]    Compiling learn-rust v0.1.0 (/opt/rustwide/workdir/dynamic-programming)
[INFO] [stderr]    Compiling futures-channel v0.3.4
[INFO] [stderr]    Compiling threads v0.1.0 (/opt/rustwide/workdir/threads)
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> threads/src/main.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |         thread.join();
[INFO] [stdout]    |         ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 34 |         let _ = thread.join();
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling quote v1.0.3
[INFO] [stderr]    Compiling net2 v0.2.33
[INFO] [stderr]    Compiling iovec v0.1.4
[INFO] [stderr]    Compiling signal-hook-registry v1.2.0
[INFO] [stderr]    Compiling num_cpus v1.12.0
[INFO] [stderr]    Compiling ffi v0.1.0 (/opt/rustwide/workdir/ffi)
[INFO] [stdout] warning: unused imports: `c_int`, `c_longlong`, and `c_uchar`
[INFO] [stdout]  --> ffi/src/main.rs:5:32
[INFO] [stdout]   |
[INFO] [stdout] 5 |     use std::os::raw::{c_char, c_int, c_longlong, c_uchar};
[INFO] [stdout]   |                                ^^^^^  ^^^^^^^^^^  ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Done` is never constructed
[INFO] [stdout]   --> ffi/src/main.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     enum RsSyncResult {
[INFO] [stdout]    |          ------------ variant in this enum
[INFO] [stdout] 13 |         Done = 0,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `RsSyncResult` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Delta` and `Blake2Hash` are never constructed
[INFO] [stdout]   --> ffi/src/main.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     enum MagicNumber {
[INFO] [stdout]    |          ----------- variants in this enum
[INFO] [stdout] 18 |         Delta = 0x72730236,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 19 |         MD4 = 0x72730136,
[INFO] [stdout] 20 |         Blake2Hash = 0x72730137,
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` block uses type `RsyncStats`, which is not FFI-safe
[INFO] [stdout]   --> ffi/src/main.rs:35:20
[INFO] [stdout]    |
[INFO] [stdout] 35 |             stats: *mut RsyncStats,
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider adding a member to this struct
[INFO] [stdout]    = note: this struct has no fields
[INFO] [stdout] note: the type is defined here
[INFO] [stdout]   --> ffi/src/main.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pub struct RsyncStats {}
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    = note: `#[warn(improper_ctypes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: linking with `cc` failed: exit status: 1
[INFO] [stdout]   |
[INFO] [stdout]   = note:  "cc" "-m64" "/tmp/rustcgTgfi6/symbols.o" "<2 object files omitted>" "-Wl,--as-needed" "-Wl,-Bdynamic" "-lrsync" "-Wl,-Bstatic" "/opt/rustwide/target/debug/deps/{liblibc-3f5563b9ba8d1726.rlib}.rlib" "<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/lib/{libstd-*,libpanic_unwind-*,libobject-*,libmemchr-*,libaddr2line-*,libgimli-*,librustc_demangle-*,libstd_detect-*,libhashbrown-*,librustc_std_workspace_alloc-*,libminiz_oxide-*,libadler2-*,libunwind-*,libcfg_if-*,liblibc-*,librustc_std_workspace_core-*,liballoc-*,libcore-*,libcompiler_builtins-*}.rlib" "-Wl,-Bdynamic" "-lutil" "-ldl" "-lutil" "-lgcc_s" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl" "-lc" "-L" "/tmp/rustcgTgfi6/raw-dylibs" "-B<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/bin/gcc-ld" "-fuse-ld=lld" "-Wl,-znostart-stop-gc" "-Wl,--eh-frame-hdr" "-Wl,-z,noexecstack" "-L" "<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-o" "/opt/rustwide/target/debug/deps/ffi-ff63cda87d645473" "-Wl,--gc-sections" "-pie" "-Wl,-z,relro,-z,now" "-Wl,-O1" "-nodefaultlibs"
[INFO] [stdout]   = note: some arguments are omitted. use `--verbose` to show all linker arguments
[INFO] [stdout]   = note: rust-lld: error: unable to find library -lrsync
[INFO] [stdout]           collect2: error: ld returned 1 exit status
[INFO] [stdout]           
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ffi` (bin "ffi") due to 1 previous error; 4 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "9398236b9342bbecb56d5fc7cf0005d0a24dd259f0a41cc53726478f13924880", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9398236b9342bbecb56d5fc7cf0005d0a24dd259f0a41cc53726478f13924880", kill_on_drop: false }`
[INFO] [stdout] 9398236b9342bbecb56d5fc7cf0005d0a24dd259f0a41cc53726478f13924880