[INFO] fetching crate burble 0.2.2...
[INFO] testing burble-0.2.2 against try#8de4c7234dd9b97c9d76b58671343fdbbc9a433e+target=x86_64-unknown-linux-musl for musl_upgrade_1_2_5_with_libc_patch_0
[INFO] extracting crate burble 0.2.2 into /workspace/builds/worker-2-tc1/source
[INFO] removed /workspace/builds/worker-2-tc1/source/.cargo/config.toml
[INFO] started tweaking crates.io crate burble 0.2.2
[INFO] finished tweaking crates.io crate burble 0.2.2
[INFO] tweaked toml for crates.io crate burble 0.2.2 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate burble 0.2.2 on toolchain 8de4c7234dd9b97c9d76b58671343fdbbc9a433e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate burble 0.2.2 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" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded thiserror-impl v1.0.39
[INFO] [stderr]   Downloaded const_format v0.2.30
[INFO] [stderr]   Downloaded dbl v0.3.2
[INFO] [stderr]   Downloaded constant_time_eq v0.2.4
[INFO] [stderr]   Downloaded sec1 v0.7.1
[INFO] [stderr]   Downloaded bitflags v2.0.1
[INFO] [stderr]   Downloaded anyhow v1.0.69
[INFO] [stderr]   Downloaded rusb v0.9.1
[INFO] [stderr]   Downloaded crypto-bigint v0.5.0
[INFO] [stderr]   Downloaded der v0.7.1
[INFO] [stderr]   Downloaded aes v0.8.2
[INFO] [stderr]   Downloaded toml_edit v0.19.4
[INFO] [stderr]   Downloaded blake3 v1.3.3
[INFO] [stderr]   Downloaded winnow v0.3.5
[INFO] [stderr]   Downloaded elliptic-curve v0.13.2
[INFO] [stderr]   Downloaded p256 v0.13.0
[INFO] [stderr]   Downloaded serde_derive v1.0.154
[INFO] [stderr]   Downloaded serde v1.0.154
[INFO] [stderr]   Downloaded burble-const v0.2.2
[INFO] [stderr]   Downloaded const-oid v0.9.2
[INFO] [stderr]   Downloaded pkcs8 v0.10.1
[INFO] [stderr]   Downloaded ecdsa v0.16.1
[INFO] [stderr]   Downloaded spki v0.7.0
[INFO] [stderr]   Downloaded primeorder v0.13.0
[INFO] [stderr]   Downloaded zeroize_derive v1.3.3
[INFO] [stderr]   Downloaded burble-crypto v0.2.2
[INFO] [stderr]   Downloaded enum-iterator-derive v1.2.0
[INFO] [stderr]   Downloaded enum-iterator v1.4.0
[INFO] [stderr]   Downloaded const_format_proc_macros v0.2.29
[INFO] [stderr]   Downloaded sscanf_macro v0.4.0
[INFO] [stderr]   Downloaded sscanf v0.4.0
[INFO] [stderr]   Downloaded thiserror v1.0.39
[INFO] [stderr]   Downloaded signature v2.0.0
[INFO] [stderr]   Downloaded structbuf v0.3.4
[INFO] [stderr]   Downloaded cmac v0.7.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e1503fc7ca263dd68b7986d52cbb79cb3c9dc65f531e39eaffbdaf228df03905
[INFO] running `Command { std: "docker" "start" "-a" "e1503fc7ca263dd68b7986d52cbb79cb3c9dc65f531e39eaffbdaf228df03905", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e1503fc7ca263dd68b7986d52cbb79cb3c9dc65f531e39eaffbdaf228df03905", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e1503fc7ca263dd68b7986d52cbb79cb3c9dc65f531e39eaffbdaf228df03905", kill_on_drop: false }`
[INFO] [stdout] e1503fc7ca263dd68b7986d52cbb79cb3c9dc65f531e39eaffbdaf228df03905
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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" "-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "build" "--frozen" "--message-format=json" "--target" "x86_64-unknown-linux-musl", kill_on_drop: false }`
[INFO] [stdout] 58a71174c1a9d468da854643a8dc7b1abe18dc4ed2b8e95e46f9da22f9c0a9f7
[INFO] running `Command { std: "docker" "start" "-a" "58a71174c1a9d468da854643a8dc7b1abe18dc4ed2b8e95e46f9da22f9c0a9f7", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.51
[INFO] [stderr]    Compiling quote v1.0.23
[INFO] [stderr]    Compiling unicode-ident v1.0.8
[INFO] [stderr]    Compiling unicode-xid v0.2.4
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]    Compiling typenum v1.16.0
[INFO] [stderr]    Compiling libc v0.2.140
[INFO] [stderr]    Compiling subtle v2.4.1
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling const-oid v0.9.2
[INFO] [stderr]    Compiling cc v1.0.79
[INFO] [stderr]    Compiling smallvec v1.10.0
[INFO] [stderr]    Compiling hashbrown v0.12.3
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/proc-macro2-1.0.51/src/lib.rs:92:30
[INFO] [stdout]    |
[INFO] [stdout] 92 |     feature(proc_macro_span, proc_macro_span_shrink)
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling base16ct v0.2.0
[INFO] [stderr]    Compiling generic-array v0.14.6
[INFO] [stderr]    Compiling serde_derive v1.0.154
[INFO] [stderr]    Compiling parking_lot_core v0.9.7
[INFO] [stderr]    Compiling indexmap v1.9.2
[INFO] [stdout] For more information about this error, try `rustc --explain E0635`.
[INFO] [stdout] 
[INFO] [stderr]    Compiling lock_api v0.4.9
[INFO] [stderr] error: could not compile `proc-macro2` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "58a71174c1a9d468da854643a8dc7b1abe18dc4ed2b8e95e46f9da22f9c0a9f7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "58a71174c1a9d468da854643a8dc7b1abe18dc4ed2b8e95e46f9da22f9c0a9f7", kill_on_drop: false }`
[INFO] [stdout] 58a71174c1a9d468da854643a8dc7b1abe18dc4ed2b8e95e46f9da22f9c0a9f7