[INFO] fetching crate backtrace-rust 0.1.0...
[INFO] documenting backtrace-rust-0.1.0 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate backtrace-rust 0.1.0 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate backtrace-rust 0.1.0 on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate backtrace-rust 0.1.0
[INFO] finished tweaking crates.io crate backtrace-rust 0.1.0
[INFO] tweaked toml for crates.io crate backtrace-rust 0.1.0 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate backtrace-rust 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] c321b58172e4add5b6c0ae049dc5ecfb59624fa615fbcf722e933af6f5cf733f
[INFO] running `Command { std: "docker" "start" "-a" "c321b58172e4add5b6c0ae049dc5ecfb59624fa615fbcf722e933af6f5cf733f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c321b58172e4add5b6c0ae049dc5ecfb59624fa615fbcf722e933af6f5cf733f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c321b58172e4add5b6c0ae049dc5ecfb59624fa615fbcf722e933af6f5cf733f", kill_on_drop: false }`
[INFO] [stdout] c321b58172e4add5b6c0ae049dc5ecfb59624fa615fbcf722e933af6f5cf733f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "RUSTDOCFLAGS=--cap-lints=warn" "-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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e968bcb8b559b07f3963797d518bb4cde87b0096a06b04ecab0d3b439c46fadc
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "e968bcb8b559b07f3963797d518bb4cde87b0096a06b04ecab0d3b439c46fadc", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.68
[INFO] [stderr]    Compiling syn v1.0.17
[INFO] [stderr]     Checking plain v0.2.3
[INFO] [stderr]     Checking stable_deref_trait v1.1.1
[INFO] [stderr]     Checking fallible-iterator v0.2.0
[INFO] [stderr]     Checking wasmparser v0.54.0
[INFO] [stderr]     Checking uuid v0.8.1
[INFO] [stderr]     Checking parity-wasm v0.41.0
[INFO] [stderr]    Compiling cpp_demangle v0.2.16
[INFO] [stderr]     Checking gimli v0.21.0
[INFO] [stderr]     Checking flate2 v1.0.14
[INFO] [stderr]     Checking memmap v0.7.0
[INFO] [stderr]     Checking object v0.19.0
[INFO] [stderr]    Compiling scroll_derive v0.10.1
[INFO] [stderr]     Checking scroll v0.10.1
[INFO] [stderr]     Checking addr2line v0.12.1
[INFO] [stderr]     Checking goblin v0.1.3
[INFO] [stderr]     Checking object v0.17.0
[INFO] [stderr]  Documenting backtrace-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: the legacy LLVM-style asm! syntax is no longer supported
[INFO] [stdout]   --> src/register.rs:60:9
[INFO] [stdout]    |
[INFO] [stdout] 60 |         asm!("" : "={rsp}"(rsp) : : : "intel")
[INFO] [stdout]    |         ----^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: replace with: `llvm_asm!`
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider migrating to the new asm! syntax specified in RFC 2873
[INFO] [stdout]    = note: alternatively, switch to llvm_asm! to keep your code working as it is
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: the legacy LLVM-style asm! syntax is no longer supported
[INFO] [stdout]   --> src/register.rs:72:9
[INFO] [stdout]    |
[INFO] [stdout] 72 |         asm!("call 1f\n1: pop rax" : "={rax}"(rip) : : : "intel")
[INFO] [stdout]    |         ----^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: replace with: `llvm_asm!`
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider migrating to the new asm! syntax specified in RFC 2873
[INFO] [stdout]    = note: alternatively, switch to llvm_asm! to keep your code working as it is
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(asm)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `backtrace-rust`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name backtrace_rust src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern addr2line=/opt/rustwide/target/debug/deps/libaddr2line-f66eb827682072d2.rmeta --extern gimli=/opt/rustwide/target/debug/deps/libgimli-dfb34e8c53d26481.rmeta --extern memmap=/opt/rustwide/target/debug/deps/libmemmap-cf335eb96481504b.rmeta --extern object=/opt/rustwide/target/debug/deps/libobject-47181894e2bbb56c.rmeta --extern rustc_demangle=/opt/rustwide/target/debug/deps/librustc_demangle-17c0fe97254f4af4.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "e968bcb8b559b07f3963797d518bb4cde87b0096a06b04ecab0d3b439c46fadc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e968bcb8b559b07f3963797d518bb4cde87b0096a06b04ecab0d3b439c46fadc", kill_on_drop: false }`
[INFO] [stdout] e968bcb8b559b07f3963797d518bb4cde87b0096a06b04ecab0d3b439c46fadc