[INFO] fetching crate merfolk 0.1.4...
[INFO] testing merfolk-0.1.4 against beta-2025-10-28 for beta-1.92-2
[INFO] extracting crate merfolk 0.1.4 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate merfolk 0.1.4
[INFO] finished tweaking crates.io crate merfolk 0.1.4
[INFO] tweaked toml for crates.io crate merfolk 0.1.4 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate merfolk 0.1.4 on toolchain beta-2025-10-28
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-10-28" "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" "+beta-2025-10-28" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 80 packages to latest compatible versions
[INFO] [stderr]       Adding derive_builder v0.10.2 (available: v0.20.2)
[INFO] [stderr]       Adding hyper v0.14.32 (available: v1.7.0)
[INFO] [stderr]       Adding rand v0.8.5 (available: v0.9.2)
[INFO] [stderr]       Adding spin v0.7.1 (available: v0.10.0)
[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" "+beta-2025-10-28" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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" "+beta-2025-10-28" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b8901754117aaba6289287e7965aec0e716f2d31c4e2459e954b9cd726e65db5
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[INFO] [stdout] b8901754117aaba6289287e7965aec0e716f2d31c4e2459e954b9cd726e65db5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0bdd7fcb1c8dd50cf2fd1f01034ffc9790eb52099015e3777684594270e597e7
[INFO] running `Command { std: "docker" "start" "-a" "0bdd7fcb1c8dd50cf2fd1f01034ffc9790eb52099015e3777684594270e597e7", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling strsim v0.10.0
[INFO] [stderr]    Compiling fnv v1.0.7
[INFO] [stderr]    Compiling syn v2.0.108
[INFO] [stderr]    Compiling anyhow v1.0.100
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]    Compiling spin v0.7.1
[INFO] [stderr]    Compiling thiserror-impl v1.0.69
[INFO] [stderr]    Compiling darling_core v0.12.4
[INFO] [stderr]    Compiling thiserror v1.0.69
[INFO] [stderr]    Compiling darling_macro v0.12.4
[INFO] [stderr]    Compiling darling v0.12.4
[INFO] [stderr]    Compiling derive_builder_core v0.10.2
[INFO] [stderr]    Compiling derive_builder_macro v0.10.2
[INFO] [stderr]    Compiling derive_builder v0.10.2
[INFO] [stderr]    Compiling merfolk v0.1.4 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 12.69s
[INFO] running `Command { std: "docker" "inspect" "0bdd7fcb1c8dd50cf2fd1f01034ffc9790eb52099015e3777684594270e597e7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0bdd7fcb1c8dd50cf2fd1f01034ffc9790eb52099015e3777684594270e597e7", kill_on_drop: false }`
[INFO] [stdout] 0bdd7fcb1c8dd50cf2fd1f01034ffc9790eb52099015e3777684594270e597e7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7d6334bdf82784cb43bb668aa3090023266838ac5d0b5215b1268910fd0e1d02
[INFO] running `Command { std: "docker" "start" "-a" "7d6334bdf82784cb43bb668aa3090023266838ac5d0b5215b1268910fd0e1d02", kill_on_drop: false }`
[INFO] [stderr]    Compiling futures-core v0.3.31
[INFO] [stderr]    Compiling futures-task v0.3.31
[INFO] [stderr]    Compiling getrandom v0.2.16
[INFO] [stderr]    Compiling socket2 v0.6.1
[INFO] [stderr]    Compiling mio v1.1.0
[INFO] [stderr]    Compiling tracing v0.1.41
[INFO] [stderr]    Compiling http-body v0.4.6
[INFO] [stderr]    Compiling socket2 v0.5.10
[INFO] [stderr]    Compiling darling_core v0.12.4
[INFO] [stderr]    Compiling futures-util v0.3.31
[INFO] [stderr]    Compiling futures-channel v0.3.31
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling tokio v1.48.0
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling darling_macro v0.12.4
[INFO] [stderr]    Compiling darling v0.12.4
[INFO] [stderr]    Compiling derive_builder_core v0.10.2
[INFO] [stderr]    Compiling derive_builder_macro v0.10.2
[INFO] [stderr]    Compiling derive_builder v0.10.2
[INFO] [stderr]    Compiling merfolk v0.1.4 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling hyper v0.14.32
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 12.06s
[INFO] running `Command { std: "docker" "inspect" "7d6334bdf82784cb43bb668aa3090023266838ac5d0b5215b1268910fd0e1d02", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7d6334bdf82784cb43bb668aa3090023266838ac5d0b5215b1268910fd0e1d02", kill_on_drop: false }`
[INFO] [stdout] 7d6334bdf82784cb43bb668aa3090023266838ac5d0b5215b1268910fd0e1d02
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 4c24e0a178589041dccbb207de5de871af6dd432d037bf9c2cbe1ed3656d37e5
[INFO] running `Command { std: "docker" "start" "-a" "4c24e0a178589041dccbb207de5de871af6dd432d037bf9c2cbe1ed3656d37e5", kill_on_drop: false }`
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.09s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/merfolk-2687c444c3bc1ce5)
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test test::backend ... ok
[INFO] [stdout] test test::frontend ... ok
[INFO] [stdout] test test::init ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests merfolk
[INFO] [stdout] 
[INFO] [stdout] running 7 tests
[INFO] [stdout] test src/lib.rs - Mer<B,F>::middlewares (line 388) - compile ... FAILED
[INFO] [stdout] test src/lib.rs - (line 32) ... FAILED
[INFO] [stdout] test src/lib.rs - Mer<B,F>::frontend (line 340) - compile ... FAILED
[INFO] [stdout] test src/helpers/smart_lock.rs - helpers::smart_lock (line 7) ... ok
[INFO] [stdout] test src/lib.rs - (line 76) ... FAILED
[INFO] [stdout] test src/lib.rs - Mer<B,F>::backend (line 364) - compile ... FAILED
[INFO] [stdout] test src/lib.rs - (line 103) - compile ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/lib.rs - Mer<B,F>::middlewares (line 388) stdout ----
[INFO] [stdout] error[E0432]: unresolved import `merfolk_backend_http`
[INFO] [stdout]  --> src/lib.rs:391:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use merfolk_backend_http::Http;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^ use of unresolved module or unlinked crate `merfolk_backend_http`
[INFO] [stdout]   |
[INFO] [stdout]   = help: if you wanted to use a crate named `merfolk_backend_http`, use `cargo add merfolk_backend_http` to add it to your `Cargo.toml`
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `merfolk_middleware_authentication`
[INFO] [stdout]  --> src/lib.rs:392:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use merfolk_middleware_authentication::Authentication;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ use of unresolved module or unlinked crate `merfolk_middleware_authentication`
[INFO] [stdout]   |
[INFO] [stdout]   = help: if you wanted to use a crate named `merfolk_middleware_authentication`, use `cargo add merfolk_middleware_authentication` to add it to your `Cargo.toml`
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of unresolved module or unlinked crate `merfolk_backend_http`
[INFO] [stdout]  --> src/lib.rs:395:14
[INFO] [stdout]   |
[INFO] [stdout] 9 |     .backend(merfolk_backend_http::Http::builder().build().unwrap())
[INFO] [stdout]   |              ^^^^^^^^^^^^^^^^^^^^ use of unresolved module or unlinked crate `merfolk_backend_http`
[INFO] [stdout]   |
[INFO] [stdout]   = help: if you wanted to use a crate named `merfolk_backend_http`, use `cargo add merfolk_backend_http` to add it to your `Cargo.toml`
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of unresolved module or unlinked crate `merfolk_frontend_register`
[INFO] [stdout]   --> src/lib.rs:396:15
[INFO] [stdout]    |
[INFO] [stdout] 10 |     .frontend(merfolk_frontend_register::Register::builder().build().unwrap())
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^^^^^^^^ use of unresolved module or unlinked crate `merfolk_frontend_register`
[INFO] [stdout]    |
[INFO] [stdout]    = help: if you wanted to use a crate named `merfolk_frontend_register`, use `cargo add merfolk_frontend_register` to add it to your `Cargo.toml`
[INFO] [stdout] help: there is an enum variant `merfolk::Error::Register`; try using the variant's enum
[INFO] [stdout]    |
[INFO] [stdout] 10 -     .frontend(merfolk_frontend_register::Register::builder().build().unwrap())
[INFO] [stdout] 10 +     .frontend(merfolk::Error::builder().build().unwrap())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0433.
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - (line 32) stdout ----
[INFO] [stdout] error[E0432]: unresolved import `merfolk_backend_http`
[INFO] [stdout]  --> src/lib.rs:36:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use merfolk_backend_http::Http;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^ use of unresolved module or unlinked crate `merfolk_backend_http`
[INFO] [stdout]   |
[INFO] [stdout]   = help: if you wanted to use a crate named `merfolk_backend_http`, use `cargo add merfolk_backend_http` to add it to your `Cargo.toml`
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `merfolk_frontend_register`
[INFO] [stdout]  --> src/lib.rs:37:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use merfolk_frontend_register::Register;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^ use of unresolved module or unlinked crate `merfolk_frontend_register`
[INFO] [stdout]   |
[INFO] [stdout]   = help: if you wanted to use a crate named `merfolk_frontend_register`, use `cargo add merfolk_frontend_register` to add it to your `Cargo.toml`
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0432`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - Mer<B,F>::frontend (line 340) stdout ----
[INFO] [stdout] error[E0433]: failed to resolve: use of unresolved module or unlinked crate `merfolk_backend_http`
[INFO] [stdout]  --> src/lib.rs:345:14
[INFO] [stdout]   |
[INFO] [stdout] 7 |     .backend(merfolk_backend_http::Http::builder().build().unwrap())
[INFO] [stdout]   |              ^^^^^^^^^^^^^^^^^^^^ use of unresolved module or unlinked crate `merfolk_backend_http`
[INFO] [stdout]   |
[INFO] [stdout]   = help: if you wanted to use a crate named `merfolk_backend_http`, use `cargo add merfolk_backend_http` to add it to your `Cargo.toml`
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of unresolved module or unlinked crate `merfolk_frontend_register`
[INFO] [stdout]  --> src/lib.rs:346:15
[INFO] [stdout]   |
[INFO] [stdout] 8 |     .frontend(merfolk_frontend_register::Register::builder().build().unwrap())
[INFO] [stdout]   |               ^^^^^^^^^^^^^^^^^^^^^^^^^ use of unresolved module or unlinked crate `merfolk_frontend_register`
[INFO] [stdout]   |
[INFO] [stdout]   = help: if you wanted to use a crate named `merfolk_frontend_register`, use `cargo add merfolk_frontend_register` to add it to your `Cargo.toml`
[INFO] [stdout] help: there is an enum variant `merfolk::Error::Register`; try using the variant's enum
[INFO] [stdout]   |
[INFO] [stdout] 8 -     .frontend(merfolk_frontend_register::Register::builder().build().unwrap())
[INFO] [stdout] 8 +     .frontend(merfolk::Error::builder().build().unwrap())
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> src/lib.rs:349:37
[INFO] [stdout]    |
[INFO] [stdout] 11 | let result: i32 = merfolk.frontend(|f| f.call("add", &(1, 2)).unwrap()).unwrap();
[INFO] [stdout]    |                                     ^  - type must be known at this point
[INFO] [stdout]    |
[INFO] [stdout] help: consider giving this closure parameter an explicit type
[INFO] [stdout]    |
[INFO] [stdout] 11 | let result: i32 = merfolk.frontend(|f: /* Type */| f.call("add", &(1, 2)).unwrap()).unwrap();
[INFO] [stdout]    |                                      ++++++++++++
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0282, E0433.
[INFO] [stdout] For more information about an error, try `rustc --explain E0282`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - (line 76) stdout ----
[INFO] [stdout] error[E0432]: unresolved import `merfolk_backend_http`
[INFO] [stdout]  --> src/lib.rs:81:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use merfolk_backend_http::Http;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^ use of unresolved module or unlinked crate `merfolk_backend_http`
[INFO] [stdout]   |
[INFO] [stdout]   = help: if you wanted to use a crate named `merfolk_backend_http`, use `cargo add merfolk_backend_http` to add it to your `Cargo.toml`
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `merfolk_frontend_register`
[INFO] [stdout]  --> src/lib.rs:82:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use merfolk_frontend_register::Register;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^ use of unresolved module or unlinked crate `merfolk_frontend_register`
[INFO] [stdout]   |
[INFO] [stdout]   = help: if you wanted to use a crate named `merfolk_frontend_register`, use `cargo add merfolk_frontend_register` to add it to your `Cargo.toml`
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> src/lib.rs:98:49
[INFO] [stdout]    |
[INFO] [stdout] 24 | let result_add: Result<i32> = merfolk.frontend(|f| f.call("add", &(1, 2))).unwrap();
[INFO] [stdout]    |                                                 ^  - type must be known at this point
[INFO] [stdout]    |
[INFO] [stdout] help: consider giving this closure parameter an explicit type
[INFO] [stdout]    |
[INFO] [stdout] 24 | let result_add: Result<i32> = merfolk.frontend(|f: /* Type */| f.call("add", &(1, 2))).unwrap();
[INFO] [stdout]    |                                                  ++++++++++++
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> src/lib.rs:99:54
[INFO] [stdout]    |
[INFO] [stdout] 25 | let result_subtract: Result<i32> = merfolk.frontend(|f| f.call("subtract", &(1, 2))).unwrap();
[INFO] [stderr] error: doctest failed, to rerun pass `--doc`
[INFO] [stdout]    |                                                      ^  - type must be known at this point
[INFO] [stdout]    |
[INFO] [stdout] help: consider giving this closure parameter an explicit type
[INFO] [stdout]    |
[INFO] [stdout] 25 | let result_subtract: Result<i32> = merfolk.frontend(|f: /* Type */| f.call("subtract", &(1, 2))).unwrap();
[INFO] [stdout]    |                                                       ++++++++++++
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0282, E0432.
[INFO] [stdout] For more information about an error, try `rustc --explain E0282`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - Mer<B,F>::backend (line 364) stdout ----
[INFO] [stdout] error[E0433]: failed to resolve: use of unresolved module or unlinked crate `merfolk_backend_http`
[INFO] [stdout]  --> src/lib.rs:369:14
[INFO] [stdout]   |
[INFO] [stdout] 7 |     .backend(merfolk_backend_http::Http::builder().build().unwrap())
[INFO] [stdout]   |              ^^^^^^^^^^^^^^^^^^^^ use of unresolved module or unlinked crate `merfolk_backend_http`
[INFO] [stdout]   |
[INFO] [stdout]   = help: if you wanted to use a crate named `merfolk_backend_http`, use `cargo add merfolk_backend_http` to add it to your `Cargo.toml`
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of unresolved module or unlinked crate `merfolk_frontend_register`
[INFO] [stdout]  --> src/lib.rs:370:15
[INFO] [stdout]   |
[INFO] [stdout] 8 |     .frontend(merfolk_frontend_register::Register::builder().build().unwrap())
[INFO] [stdout]   |               ^^^^^^^^^^^^^^^^^^^^^^^^^ use of unresolved module or unlinked crate `merfolk_frontend_register`
[INFO] [stdout]   |
[INFO] [stdout]   = help: if you wanted to use a crate named `merfolk_frontend_register`, use `cargo add merfolk_frontend_register` to add it to your `Cargo.toml`
[INFO] [stdout] help: there is an enum variant `merfolk::Error::Register`; try using the variant's enum
[INFO] [stdout]   |
[INFO] [stdout] 8 -     .frontend(merfolk_frontend_register::Register::builder().build().unwrap())
[INFO] [stdout] 8 +     .frontend(merfolk::Error::builder().build().unwrap())
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> src/lib.rs:373:18
[INFO] [stdout]    |
[INFO] [stdout] 11 | merfolk.backend(|b| b.stop().unwrap()).unwrap();
[INFO] [stdout]    |                  ^  - type must be known at this point
[INFO] [stdout]    |
[INFO] [stdout] help: consider giving this closure parameter an explicit type
[INFO] [stdout]    |
[INFO] [stdout] 11 | merfolk.backend(|b: /* Type */| b.stop().unwrap()).unwrap();
[INFO] [stdout]    |                   ++++++++++++
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0282, E0433.
[INFO] [stdout] For more information about an error, try `rustc --explain E0282`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - (line 103) stdout ----
[INFO] [stdout] error[E0432]: unresolved import `merfolk_backend_http`
[INFO] [stdout]  --> src/lib.rs:107:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use merfolk_backend_http::Http;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^ use of unresolved module or unlinked crate `merfolk_backend_http`
[INFO] [stdout]   |
[INFO] [stdout]   = help: if you wanted to use a crate named `merfolk_backend_http`, use `cargo add merfolk_backend_http` to add it to your `Cargo.toml`
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `merfolk_frontend_register`
[INFO] [stdout]  --> src/lib.rs:108:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use merfolk_frontend_register::Register;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^ use of unresolved module or unlinked crate `merfolk_frontend_register`
[INFO] [stdout]   |
[INFO] [stdout]   = help: if you wanted to use a crate named `merfolk_frontend_register`, use `cargo add merfolk_frontend_register` to add it to your `Cargo.toml`
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `merfolk_frontend_derive`
[INFO] [stdout]  --> src/lib.rs:109:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use merfolk_frontend_derive::frontend;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^ use of unresolved module or unlinked crate `merfolk_frontend_derive`
[INFO] [stdout]   |
[INFO] [stdout]   = help: if you wanted to use a crate named `merfolk_frontend_derive`, use `cargo add merfolk_frontend_derive` to add it to your `Cargo.toml`
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `merfolk_frontend_duplex`
[INFO] [stdout]  --> src/lib.rs:110:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use merfolk_frontend_duplex::Duplex;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^ use of unresolved module or unlinked crate `merfolk_frontend_duplex`
[INFO] [stdout]   |
[INFO] [stdout]   = help: if you wanted to use a crate named `merfolk_frontend_duplex`, use `cargo add merfolk_frontend_duplex` to add it to your `Cargo.toml`
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `merfolk_middleware_router`
[INFO] [stdout]   --> src/lib.rs:111:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use merfolk_middleware_router::Router;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^ use of unresolved module or unlinked crate `merfolk_middleware_router`
[INFO] [stdout]    |
[INFO] [stdout]    = help: if you wanted to use a crate named `merfolk_middleware_router`, use `cargo add merfolk_middleware_router` to add it to your `Cargo.toml`
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no function or associated item named `builder` found for struct `main::Receiver` in the current scope
[INFO] [stdout]   --> src/lib.rs:135:35
[INFO] [stdout]    |
[INFO] [stdout] 14 | struct Receiver {}
[INFO] [stdout]    | --------------- function or associated item `builder` not found for this struct
[INFO] [stdout] ...
[INFO] [stdout] 34 | let receiver_frontend = Receiver::builder().build().unwrap();
[INFO] [stdout]    |                                   ^^^^^^^ function or associated item not found in `main::Receiver`
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 6 previous errors
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0599.
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/lib.rs - (line 103)
[INFO] [stdout]     src/lib.rs - (line 32)
[INFO] [stdout]     src/lib.rs - (line 76)
[INFO] [stdout]     src/lib.rs - Mer<B,F>::backend (line 364)
[INFO] [stdout]     src/lib.rs - Mer<B,F>::frontend (line 340)
[INFO] [stdout]     src/lib.rs - Mer<B,F>::middlewares (line 388)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 1 passed; 6 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.48s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "4c24e0a178589041dccbb207de5de871af6dd432d037bf9c2cbe1ed3656d37e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4c24e0a178589041dccbb207de5de871af6dd432d037bf9c2cbe1ed3656d37e5", kill_on_drop: false }`
[INFO] [stdout] 4c24e0a178589041dccbb207de5de871af6dd432d037bf9c2cbe1ed3656d37e5