[INFO] cloning repository https://github.com/stellar/soroban-example-dapp
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/stellar/soroban-example-dapp" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fstellar%2Fsoroban-example-dapp", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fstellar%2Fsoroban-example-dapp'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 07504b922bc75a48e5220711aea2cb4962f90367
[INFO] checking stellar/soroban-example-dapp against master#af4a5a13a15fa0c60e06321077ef452f769b42fd for pr-122960-4
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fstellar%2Fsoroban-example-dapp" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/stellar/soroban-example-dapp on toolchain af4a5a13a15fa0c60e06321077ef452f769b42fd
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-1-tc1/source/.cargo/config.toml
[INFO] removed /workspace/builds/worker-1-tc1/source/rust-toolchain.toml
[INFO] started tweaking git repo https://github.com/stellar/soroban-example-dapp
[INFO] finished tweaking git repo https://github.com/stellar/soroban-example-dapp
[INFO] tweaked toml for git repo https://github.com/stellar/soroban-example-dapp written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/stellar/soroban-example-dapp 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" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded derive_arbitrary v1.3.0
[INFO] [stderr]   Downloaded stellar-strkey v0.0.7
[INFO] [stderr]   Downloaded soroban-env-guest v20.0.0-rc2
[INFO] [stderr]   Downloaded soroban-env-macros v20.0.0-rc2
[INFO] [stderr]   Downloaded soroban-spec v20.0.0-rc2
[INFO] [stderr]   Downloaded soroban-native-sdk-macros v20.0.0-rc2
[INFO] [stderr]   Downloaded soroban-spec-rust v20.0.0-rc2
[INFO] [stderr]   Downloaded crate-git-revision v0.0.6
[INFO] [stderr]   Downloaded soroban-sdk-macros v20.0.0-rc2
[INFO] [stderr]   Downloaded soroban-sdk v20.0.0-rc2
[INFO] [stderr]   Downloaded ed25519 v2.2.2
[INFO] [stderr]   Downloaded bytes-lit v0.0.5
[INFO] [stderr]   Downloaded prettyplease v0.2.4
[INFO] [stderr]   Downloaded ctor v0.2.4
[INFO] [stderr]   Downloaded ecdsa v0.16.7
[INFO] [stderr]   Downloaded wasmparser-nostd v0.100.1
[INFO] [stderr]   Downloaded ed25519-dalek v2.0.0
[INFO] [stderr]   Downloaded curve25519-dalek v4.1.0
[INFO] [stderr]   Downloaded soroban-env-host v20.0.0-rc2
[INFO] [stderr]   Downloaded stellar-xdr v20.0.0-rc1
[INFO] [stderr]   Downloaded serde_with v3.0.0
[INFO] [stderr]   Downloaded soroban-wasmi v0.31.0-soroban1
[INFO] [stderr]   Downloaded wasmparser v0.88.0
[INFO] [stderr]   Downloaded sec1 v0.7.2
[INFO] [stderr]   Downloaded wasmi_core v0.13.0
[INFO] [stderr]   Downloaded soroban-env-common v20.0.0-rc2
[INFO] [stderr]   Downloaded serde_with_macros v3.0.0
[INFO] [stderr]   Downloaded soroban-ledger-snapshot v20.0.0-rc2
[INFO] [stderr]   Downloaded num-derive v0.4.0
[INFO] [stderr]   Downloaded wasmi_arena v0.4.0
[INFO] [stderr]   Downloaded soroban-token-sdk v20.0.0-rc2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e7504c9384e374ecf4550cdf129b911359b1d5511a21057e00d6d2e82e61e4b4
[INFO] running `Command { std: "docker" "start" "-a" "e7504c9384e374ecf4550cdf129b911359b1d5511a21057e00d6d2e82e61e4b4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e7504c9384e374ecf4550cdf129b911359b1d5511a21057e00d6d2e82e61e4b4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e7504c9384e374ecf4550cdf129b911359b1d5511a21057e00d6d2e82e61e4b4", kill_on_drop: false }`
[INFO] [stdout] e7504c9384e374ecf4550cdf129b911359b1d5511a21057e00d6d2e82e61e4b4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 95b6c3c6249468d6b0118d72408065921467c9f2e96e2753541633f9a5cf177e
[INFO] running `Command { std: "docker" "start" "-a" "95b6c3c6249468d6b0118d72408065921467c9f2e96e2753541633f9a5cf177e", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde_derive v1.0.162
[INFO] [stderr]    Compiling serde v1.0.162
[INFO] [stderr]     Checking zeroize v1.6.0
[INFO] [stderr]    Compiling itoa v1.0.6
[INFO] [stderr]    Compiling ryu v1.0.13
[INFO] [stderr]    Compiling libc v0.2.147
[INFO] [stderr]     Checking const-oid v0.9.4
[INFO] [stderr]     Checking subtle v2.5.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.56
[INFO] [stderr]    Compiling generic-array v0.14.7
[INFO] [stderr]    Compiling semver v1.0.17
[INFO] [stderr]    Compiling either v1.8.1
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling paste v1.0.13
[INFO] [stderr]    Compiling indexmap v1.9.3
[INFO] [stderr]     Checking cpufeatures v0.2.7
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/proc-macro2-1.0.56/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 memchr v2.5.0
[INFO] [stderr]    Compiling platforms v3.1.2
[INFO] [stderr]     Checking der v0.7.7
[INFO] [stderr]     Checking base16ct v0.2.0
[INFO] [stderr]    Compiling itertools v0.10.5
[INFO] [stderr]     Checking indexmap-nostd v0.4.0
[INFO] [stderr]     Checking downcast-rs v1.2.0
[INFO] [stderr]    Compiling backtrace v0.3.67
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]     Checking spin v0.9.8
[INFO] [stderr]     Checking wasmparser-nostd v0.100.1
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0635`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `proc-macro2` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "95b6c3c6249468d6b0118d72408065921467c9f2e96e2753541633f9a5cf177e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "95b6c3c6249468d6b0118d72408065921467c9f2e96e2753541633f9a5cf177e", kill_on_drop: false }`
[INFO] [stdout] 95b6c3c6249468d6b0118d72408065921467c9f2e96e2753541633f9a5cf177e