[INFO] fetching crate ruma-serde 0.6.1...
[INFO] testing ruma-serde-0.6.1 against 1.90.0 for beta-1.91-3
[INFO] extracting crate ruma-serde 0.6.1 into /workspace/builds/worker-0-tc1/source
[INFO] started tweaking crates.io crate ruma-serde 0.6.1
[INFO] finished tweaking crates.io crate ruma-serde 0.6.1
[INFO] tweaked toml for crates.io crate ruma-serde 0.6.1 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate ruma-serde 0.6.1 on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "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" "+1.90.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 27 packages to latest compatible versions
[INFO] [stderr]       Adding base64 v0.13.1 (available: v0.22.1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded js_int v0.2.2
[INFO] [stderr]   Downloaded ruma-serde-macros v0.6.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 47d290df0f43b09bc204ce7a199b547a7918b6a8ca07e4538c3d5253d85281d4
[INFO] running `Command { std: "docker" "start" "-a" "47d290df0f43b09bc204ce7a199b547a7918b6a8ca07e4538c3d5253d85281d4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "47d290df0f43b09bc204ce7a199b547a7918b6a8ca07e4538c3d5253d85281d4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "47d290df0f43b09bc204ce7a199b547a7918b6a8ca07e4538c3d5253d85281d4", kill_on_drop: false }`
[INFO] [stdout] 47d290df0f43b09bc204ce7a199b547a7918b6a8ca07e4538c3d5253d85281d4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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=warn" "-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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7597cb6de709b167d72bae025f665e9de5c494cb5d1f36cf4082b98db495b45b
[INFO] running `Command { std: "docker" "start" "-a" "7597cb6de709b167d72bae025f665e9de5c494cb5d1f36cf4082b98db495b45b", kill_on_drop: false }`
[INFO] [stderr]    Compiling indexmap v2.11.4
[INFO] [stderr]    Compiling serde_json v1.0.145
[INFO] [stderr]    Compiling percent-encoding v2.3.2
[INFO] [stderr]    Compiling syn v2.0.106
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling form_urlencoded v1.2.2
[INFO] [stderr]    Compiling toml_edit v0.19.15
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]    Compiling proc-macro-crate v1.3.1
[INFO] [stderr]    Compiling ruma-serde-macros v0.6.1
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]    Compiling js_int v0.2.2
[INFO] [stderr]    Compiling ruma-serde v0.6.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 16.88s
[INFO] running `Command { std: "docker" "inspect" "7597cb6de709b167d72bae025f665e9de5c494cb5d1f36cf4082b98db495b45b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7597cb6de709b167d72bae025f665e9de5c494cb5d1f36cf4082b98db495b45b", kill_on_drop: false }`
[INFO] [stdout] 7597cb6de709b167d72bae025f665e9de5c494cb5d1f36cf4082b98db495b45b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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=warn" "-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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4e69ea13ffd438c8dec71d5a764093f1f990ade62cd4901f457c08561906853f
[INFO] running `Command { std: "docker" "start" "-a" "4e69ea13ffd438c8dec71d5a764093f1f990ade62cd4901f457c08561906853f", kill_on_drop: false }`
[INFO] [stderr]    Compiling ruma-serde v0.6.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0432]: unresolved import `ruma_identifiers`
[INFO] [stdout]   --> tests/empty_strings.rs:52:9
[INFO] [stdout]    |
[INFO] [stdout] 52 |     use ruma_identifiers::{user_id, UserId};
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^ use of unresolved module or unlinked crate `ruma_identifiers`
[INFO] [stdout]    |
[INFO] [stdout]    = help: if you wanted to use a crate named `ruma_identifiers`, use `cargo add ruma_identifiers` to add it to your `Cargo.toml`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ruma-serde` (test "empty_strings") due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: struct `Wrapper` is never constructed
[INFO] [stdout]    --> tests/url_deserialize.rs:177:8
[INFO] [stdout]     |
[INFO] [stdout] 177 | struct Wrapper<T> {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Struct` is never constructed
[INFO] [stdout]    --> tests/url_deserialize.rs:188:8
[INFO] [stdout]     |
[INFO] [stdout] 188 | struct Struct<'a> {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ListStruct` is never constructed
[INFO] [stdout]    --> tests/url_deserialize.rs:199:8
[INFO] [stdout]     |
[INFO] [stdout] 199 | struct ListStruct {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "4e69ea13ffd438c8dec71d5a764093f1f990ade62cd4901f457c08561906853f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4e69ea13ffd438c8dec71d5a764093f1f990ade62cd4901f457c08561906853f", kill_on_drop: false }`
[INFO] [stdout] 4e69ea13ffd438c8dec71d5a764093f1f990ade62cd4901f457c08561906853f