[INFO] fetching crate iroh-sync 0.15.0...
[INFO] testing iroh-sync-0.15.0 against master#c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38 for pr-146098-7
[INFO] extracting crate iroh-sync 0.15.0 into /workspace/builds/worker-3-tc1/source
[INFO] started tweaking crates.io crate iroh-sync 0.15.0
[INFO] finished tweaking crates.io crate iroh-sync 0.15.0
[INFO] tweaked toml for crates.io crate iroh-sync 0.15.0 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate iroh-sync 0.15.0 on toolchain c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 498 packages to latest compatible versions
[INFO] [stderr]       Adding derive_more v1.0.0 (available: v2.0.1)
[INFO] [stderr]       Adding iroh-base v0.15.0 (available: v0.95.1)
[INFO] [stderr]       Adding iroh-metrics v0.15.0 (available: v0.37.0)
[INFO] [stderr]       Adding iroh-net v0.15.0 (available: v0.28.2)
[INFO] [stderr]       Adding lru v0.12.5 (available: v0.16.2)
[INFO] [stderr]       Adding quinn v0.10.2 (available: v0.11.9)
[INFO] [stderr]       Adding rand v0.8.5 (available: v0.9.2)
[INFO] [stderr]       Adding rand_chacha v0.3.1 (available: v0.9.0)
[INFO] [stderr]       Adding rand_core v0.6.4 (available: v0.9.3)
[INFO] [stderr]       Adding redb v1.5.2 (available: v3.1.0)
[INFO] [stderr]       Adding redb v2.6.3 (available: v3.1.0)
[INFO] [stderr]       Adding strum v0.25.0 (available: v0.27.2)
[INFO] [stderr]       Adding test-strategy v0.3.1 (available: v0.4.3)
[INFO] [stderr]       Adding thiserror v1.0.69 (available: v2.0.17)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded strum v0.25.0
[INFO] [stderr]   Downloaded strum_macros v0.25.3
[INFO] [stderr]   Downloaded quinn-udp v0.4.1
[INFO] [stderr]   Downloaded structmeta-derive v0.2.0
[INFO] [stderr]   Downloaded structmeta v0.2.0
[INFO] [stderr]   Downloaded iroh-metrics v0.15.0
[INFO] [stderr]   Downloaded quinn v0.10.2
[INFO] [stderr]   Downloaded enumflags2 v0.7.12
[INFO] [stderr]   Downloaded simple-dns v0.6.2
[INFO] [stderr]   Downloaded hickory-resolver v0.24.4
[INFO] [stderr]   Downloaded backoff v0.4.0
[INFO] [stderr]   Downloaded ssh-key v0.6.7
[INFO] [stderr]   Downloaded memalloc v0.1.0
[INFO] [stderr]   Downloaded default-net v0.20.0
[INFO] [stderr]   Downloaded bounded-integer v0.5.8
[INFO] [stderr]   Downloaded netlink-packet-core v0.7.0
[INFO] [stderr]   Downloaded bao-tree v0.13.0
[INFO] [stderr]   Downloaded hickory-proto v0.24.4
[INFO] [stderr]   Downloaded iroh-blake3 v1.4.5
[INFO] [stderr]   Downloaded asn1-rs v0.6.2
[INFO] [stderr]   Downloaded x509-parser v0.16.0
[INFO] [stderr]   Downloaded x509-parser v0.15.1
[INFO] [stderr]   Downloaded iroh-net v0.15.0
[INFO] [stderr]   Downloaded wmi v0.13.4
[INFO] [stderr]   Downloaded enumflags2_derive v0.7.12
[INFO] [stderr]   Downloaded precis-tools v0.1.9
[INFO] [stderr]   Downloaded pest_derive v2.8.3
[INFO] [stderr]   Downloaded pnet_macros v0.34.0
[INFO] [stderr]   Downloaded no-std-net v0.6.0
[INFO] [stderr]   Downloaded pnet_base v0.34.0
[INFO] [stderr]   Downloaded asn1-rs-derive v0.5.1
[INFO] [stderr]   Downloaded hmac-sha256 v1.1.12
[INFO] [stderr]   Downloaded hostname-validator v1.1.1
[INFO] [stderr]   Downloaded quoted-string-parser v0.1.0
[INFO] [stderr]   Downloaded rcgen v0.12.1
[INFO] [stderr]   Downloaded netlink-packet-route v0.17.1
[INFO] [stderr]   Downloaded der-parser v9.0.0
[INFO] [stderr]   Downloaded tokio-rustls-acme v0.3.0
[INFO] [stderr]   Downloaded watchable v1.1.2
[INFO] [stderr]   Downloaded windows-core v0.51.1
[INFO] [stderr]   Downloaded pest_meta v2.8.3
[INFO] [stderr]   Downloaded rustls-native-certs v0.6.3
[INFO] [stderr]   Downloaded rtnetlink v0.13.1
[INFO] [stderr]   Downloaded fallible-iterator v0.3.0
[INFO] [stderr]   Downloaded hmac-sha1 v0.2.2
[INFO] [stderr]   Downloaded pest_generator v2.8.3
[INFO] [stderr]   Downloaded precis-profiles v0.1.13
[INFO] [stderr]   Downloaded pnet_packet v0.34.0
[INFO] [stderr]   Downloaded surge-ping v0.8.3
[INFO] [stderr]   Downloaded event-listener v4.0.3
[INFO] [stderr]   Downloaded lru v0.12.5
[INFO] [stderr]   Downloaded nanorand v0.7.0
[INFO] [stderr]   Downloaded igd-next v0.14.3
[INFO] [stderr]   Downloaded salsa20 v0.10.2
[INFO] [stderr]   Downloaded crypto_box v0.9.1
[INFO] [stderr]   Downloaded p521 v0.13.3
[INFO] [stderr]   Downloaded ssh-cipher v0.2.0
[INFO] [stderr]   Downloaded iroh-base v0.15.0
[INFO] [stderr]   Downloaded erased_set v0.7.0
[INFO] [stderr]   Downloaded erased-serde v0.3.31
[INFO] [stderr]   Downloaded struct_iterable_derive v0.1.0
[INFO] [stderr]   Downloaded struct_iterable_internal v0.1.1
[INFO] [stderr]   Downloaded der_derive v0.7.3
[INFO] [stderr]   Downloaded pkarr v1.1.5
[INFO] [stderr]   Downloaded netlink-proto v0.11.5
[INFO] [stderr]   Downloaded pnet_macros_support v0.34.0
[INFO] [stderr]   Downloaded ttl_cache v0.5.1
[INFO] [stderr]   Downloaded prometheus-client-derive-encode v0.4.2
[INFO] [stderr]   Downloaded prometheus-client v0.22.3
[INFO] [stderr]   Downloaded struct_iterable v0.1.1
[INFO] [stderr]   Downloaded precis-core v0.1.11
[INFO] [stderr]   Downloaded quinn-proto v0.10.6
[INFO] [stderr]   Downloaded redb v1.5.2
[INFO] [stderr]   Downloaded crypto_secretbox v0.1.1
[INFO] [stderr]   Downloaded ssh-encoding v0.2.0
[INFO] [stderr]   Downloaded nix v0.26.4
[INFO] [stderr]   Downloaded pest v2.8.3
[INFO] [stderr]   Downloaded rcgen v0.11.3
[INFO] [stderr]   Downloaded ucd-parse v0.1.13
[INFO] [stderr]   Downloaded oid-registry v0.7.1
[INFO] [stderr]   Downloaded test-strategy v0.3.1
[INFO] [stderr]   Downloaded regex-lite v0.1.8
[INFO] [stderr]   Downloaded stun-rs v0.1.11
[INFO] [stderr]   Downloaded windows v0.51.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d96983712f0fc4448b2c82c95b83f4832813da084a8e0163b4ab319cd8230832
[INFO] running `Command { std: "docker" "start" "-a" "d96983712f0fc4448b2c82c95b83f4832813da084a8e0163b4ab319cd8230832", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d96983712f0fc4448b2c82c95b83f4832813da084a8e0163b4ab319cd8230832", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d96983712f0fc4448b2c82c95b83f4832813da084a8e0163b4ab319cd8230832", kill_on_drop: false }`
[INFO] [stdout] d96983712f0fc4448b2c82c95b83f4832813da084a8e0163b4ab319cd8230832
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2b8a52cd40edc6b89ca636cede56b7a6b76c80a3f52f209aa3824c2a5fc83a43
[INFO] running `Command { std: "docker" "start" "-a" "2b8a52cd40edc6b89ca636cede56b7a6b76c80a3f52f209aa3824c2a5fc83a43", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.177
[INFO] [stderr]    Compiling serde_core v1.0.228
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]    Compiling memchr v2.7.6
[INFO] [stderr]    Compiling pin-project-lite v0.2.16
[INFO] [stderr]    Compiling typenum v1.19.0
[INFO] [stderr]    Compiling zeroize v1.8.2
[INFO] [stderr]    Compiling generic-array v0.14.9
[INFO] [stderr]    Compiling smallvec v1.15.1
[INFO] [stderr]    Compiling once_cell v1.21.3
[INFO] [stderr]    Compiling stable_deref_trait v1.2.1
[INFO] [stderr]    Compiling quote v1.0.42
[INFO] [stderr]    Compiling futures-io v0.3.31
[INFO] [stderr]    Compiling slab v0.4.11
[INFO] [stderr]    Compiling writeable v0.6.2
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling litemap v0.8.1
[INFO] [stderr]    Compiling ring v0.17.14
[INFO] [stderr]    Compiling icu_properties_data v2.1.1
[INFO] [stderr]    Compiling equivalent v1.0.2
[INFO] [stderr]    Compiling cpufeatures v0.2.17
[INFO] [stderr]    Compiling syn v2.0.110
[INFO] [stderr]    Compiling time-core v0.1.6
[INFO] [stderr]    Compiling num-conv v0.1.0
[INFO] [stderr]    Compiling icu_normalizer_data v2.1.1
[INFO] [stderr]    Compiling tracing-core v0.1.34
[INFO] [stderr]    Compiling powerfmt v0.2.0
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling untrusted v0.9.0
[INFO] [stderr]    Compiling hashbrown v0.16.0
[INFO] [stderr]    Compiling aho-corasick v1.1.4
[INFO] [stderr]    Compiling regex-syntax v0.8.8
[INFO] [stderr]    Compiling percent-encoding v2.3.2
[INFO] [stderr]    Compiling time-macros v0.2.24
[INFO] [stderr]    Compiling lock_api v0.4.14
[INFO] [stderr]    Compiling httparse v1.10.1
[INFO] [stderr]    Compiling form_urlencoded v1.2.2
[INFO] [stderr]    Compiling nom v7.1.3
[INFO] [stderr]    Compiling parking_lot_core v0.9.12
[INFO] [stderr]    Compiling rustls v0.21.12
[INFO] [stderr]    Compiling anyhow v1.0.100
[INFO] [stderr]    Compiling unicode-xid v0.2.6
[INFO] [stderr]    Compiling regex-lite v0.1.8
[INFO] [stderr]    Compiling semver v1.0.27
[INFO] [stderr]    Compiling tinyvec v1.10.0
[INFO] [stderr]    Compiling ucd-parse v0.1.13
[INFO] [stderr]    Compiling indexmap v2.12.0
[INFO] [stderr]    Compiling rustc_version v0.4.1
[INFO] [stderr]    Compiling getrandom v0.3.4
[INFO] [stderr]    Compiling proc-macro-error-attr v0.4.12
[INFO] [stderr]    Compiling block-buffer v0.10.4
[INFO] [stderr]    Compiling inout v0.1.4
[INFO] [stderr]    Compiling curve25519-dalek v4.1.3
[INFO] [stderr]    Compiling bitflags v2.10.0
[INFO] [stderr]    Compiling rusticata-macros v4.1.0
[INFO] [stderr]    Compiling rustversion v1.0.22
[INFO] [stderr]    Compiling getrandom v0.2.16
[INFO] [stderr]    Compiling signal-hook-registry v1.4.6
[INFO] [stderr]    Compiling socket2 v0.6.1
[INFO] [stderr]    Compiling mio v1.1.0
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling socket2 v0.5.10
[INFO] [stderr]    Compiling thiserror v2.0.17
[INFO] [stderr]    Compiling crypto-common v0.1.6
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling digest v0.10.7
[INFO] [stderr]    Compiling cipher v0.4.4
[INFO] [stderr]    Compiling parking_lot v0.12.5
[INFO] [stderr]    Compiling sha2 v0.10.9
[INFO] [stderr]    Compiling num-integer v0.1.46
[INFO] [stderr]    Compiling proc-macro-error v0.4.12
[INFO] [stderr]    Compiling data-encoding v2.9.0
[INFO] [stderr]    Compiling deranged v0.5.5
[INFO] [stderr]    Compiling proc-macro-hack v0.5.20+deprecated
[INFO] [stderr]    Compiling byteorder v1.5.0
[INFO] [stderr]    Compiling regex-automata v0.4.13
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling ipnet v2.11.0
[INFO] [stderr]    Compiling ucd-trie v0.1.7
[INFO] [stderr]    Compiling parking v2.2.1
[INFO] [stderr]    Compiling num-bigint v0.4.6
[INFO] [stderr]    Compiling pest v2.8.3
[INFO] [stderr]    Compiling ring v0.16.20
[INFO] [stderr]    Compiling winnow v0.7.13
[INFO] [stderr]    Compiling base16ct v0.2.0
[INFO] [stderr]    Compiling fastrand v2.3.0
[INFO] [stderr]    Compiling ref-cast v1.0.25
[INFO] [stderr]    Compiling synstructure v0.13.2
[INFO] [stderr]    Compiling signature v2.2.0
[INFO] [stderr]    Compiling base64ct v1.8.0
[INFO] [stderr]    Compiling pem-rfc7468 v0.7.0
[INFO] [stderr]    Compiling serde_json v1.0.145
[INFO] [stderr]    Compiling rand_core v0.9.3
[INFO] [stderr]    Compiling universal-hash v0.5.1
[INFO] [stderr]    Compiling iroh-blake3 v1.4.5
[INFO] [stderr]    Compiling encoding_rs v0.8.35
[INFO] [stderr]    Compiling untrusted v0.7.1
[INFO] [stderr]    Compiling webpki-roots v0.25.4
[INFO] [stderr]    Compiling toml_datetime v0.7.3
[INFO] [stderr]    Compiling oid-registry v0.7.1
[INFO] [stderr]    Compiling no-std-net v0.6.0
[INFO] [stderr]    Compiling spin v0.5.2
[INFO] [stderr]    Compiling linked-hash-map v0.5.6
[INFO] [stderr]    Compiling pest_meta v2.8.3
[INFO] [stderr]    Compiling opaque-debug v0.3.1
[INFO] [stderr]    Compiling poly1305 v0.8.0
[INFO] [stderr]    Compiling pnet_base v0.34.0
[INFO] [stderr]    Compiling rand_chacha v0.9.0
[INFO] [stderr]    Compiling pest_generator v2.8.3
[INFO] [stderr]    Compiling ssh-encoding v0.2.0
[INFO] [stderr]    Compiling sct v0.7.1
[INFO] [stderr]    Compiling rustls-webpki v0.101.7
[INFO] [stderr]    Compiling futures-lite v2.6.1
[INFO] [stderr]    Compiling syn-mid v0.5.4
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]    Compiling pem v3.0.6
[INFO] [stderr] error: could not compile `syn` (lib)
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38/bin/rustc --crate-name syn --edition=2018 /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/syn-1.0.109/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no --cfg 'feature="clone-impls"' --cfg 'feature="default"' --cfg 'feature="derive"' --cfg 'feature="extra-traits"' --cfg 'feature="full"' --cfg 'feature="parsing"' --cfg 'feature="printing"' --cfg 'feature="proc-macro"' --cfg 'feature="quote"' --cfg 'feature="visit"' --cfg 'feature="visit-mut"' --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values("clone-impls", "default", "derive", "extra-traits", "fold", "full", "parsing", "printing", "proc-macro", "quote", "test", "visit", "visit-mut"))' -C metadata=4c901fe3bb49375d -C extra-filename=-25128780be706364 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-468b9eb877b5dfe2.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-a2076238886032d4.rmeta --extern unicode_ident=/opt/rustwide/target/debug/deps/libunicode_ident-6c0afd1e85ed9e63.rmeta --cap-lints allow --cap-lints=forbid` (signal: 9, SIGKILL: kill)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `syn` (lib)
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38/bin/rustc --crate-name syn --edition=2021 /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/syn-2.0.110/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no --cfg 'feature="clone-impls"' --cfg 'feature="default"' --cfg 'feature="derive"' --cfg 'feature="extra-traits"' --cfg 'feature="fold"' --cfg 'feature="full"' --cfg 'feature="parsing"' --cfg 'feature="printing"' --cfg 'feature="proc-macro"' --cfg 'feature="visit"' --cfg 'feature="visit-mut"' --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values("clone-impls", "default", "derive", "extra-traits", "fold", "full", "parsing", "printing", "proc-macro", "test", "visit", "visit-mut"))' -C metadata=a33832a2b042f239 -C extra-filename=-8d0cfc8adc29ed77 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-468b9eb877b5dfe2.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-a2076238886032d4.rmeta --extern unicode_ident=/opt/rustwide/target/debug/deps/libunicode_ident-6c0afd1e85ed9e63.rmeta --cap-lints allow --cap-lints=forbid` (signal: 9, SIGKILL: kill)
[INFO] running `Command { std: "docker" "inspect" "2b8a52cd40edc6b89ca636cede56b7a6b76c80a3f52f209aa3824c2a5fc83a43", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2b8a52cd40edc6b89ca636cede56b7a6b76c80a3f52f209aa3824c2a5fc83a43", kill_on_drop: false }`
[INFO] [stdout] 2b8a52cd40edc6b89ca636cede56b7a6b76c80a3f52f209aa3824c2a5fc83a43