[INFO] fetching crate ufmt_float 0.1.0...
[INFO] testing ufmt_float-0.1.0 against beta-2020-07-24 for beta-1.46-1
[INFO] extracting crate ufmt_float 0.1.0 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate ufmt_float 0.1.0 on toolchain beta-2020-07-24
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ufmt_float 0.1.0
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate ufmt_float 0.1.0
[INFO] tweaked toml for crates.io crate ufmt_float 0.1.0 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6d5b7e7a3b71039b6926b584007ab20625519c6cc310649b453cb640921f2701
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "6d5b7e7a3b71039b6926b584007ab20625519c6cc310649b453cb640921f2701", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6d5b7e7a3b71039b6926b584007ab20625519c6cc310649b453cb640921f2701", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6d5b7e7a3b71039b6926b584007ab20625519c6cc310649b453cb640921f2701", kill_on_drop: false }`
[INFO] [stdout] 6d5b7e7a3b71039b6926b584007ab20625519c6cc310649b453cb640921f2701
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 54180a35a3f3cd684e3f578c77a26befcd6ba9573122bc5eba354ca0121cd4b8
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "54180a35a3f3cd684e3f578c77a26befcd6ba9573122bc5eba354ca0121cd4b8", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.19
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.37
[INFO] [stderr]    Compiling proc-macro-hack v0.5.18
[INFO] [stderr]    Compiling ufmt-write v0.1.0
[INFO] [stderr]    Compiling micromath v1.0.1
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling ufmt-macros v0.1.1
[INFO] [stderr]    Compiling ufmt v0.1.0
[INFO] [stderr]    Compiling ufmt_float v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 21.38s
[INFO] running `Command { std: "docker" "inspect" "54180a35a3f3cd684e3f578c77a26befcd6ba9573122bc5eba354ca0121cd4b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "54180a35a3f3cd684e3f578c77a26befcd6ba9573122bc5eba354ca0121cd4b8", kill_on_drop: false }`
[INFO] [stdout] 54180a35a3f3cd684e3f578c77a26befcd6ba9573122bc5eba354ca0121cd4b8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cd389f44e0270897a14622cafb0467ff2b68c6bab37866c2417ec15e9c329ffe
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "cd389f44e0270897a14622cafb0467ff2b68c6bab37866c2417ec15e9c329ffe", kill_on_drop: false }`
[INFO] [stderr]    Compiling ufmt_float v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.83s
[INFO] running `Command { std: "docker" "inspect" "cd389f44e0270897a14622cafb0467ff2b68c6bab37866c2417ec15e9c329ffe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cd389f44e0270897a14622cafb0467ff2b68c6bab37866c2417ec15e9c329ffe", kill_on_drop: false }`
[INFO] [stdout] cd389f44e0270897a14622cafb0467ff2b68c6bab37866c2417ec15e9c329ffe
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 7b0b6c964b5d920324a804bb6895dbf51d5619ae408ec143820353d1c2a5fa4a
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "7b0b6c964b5d920324a804bb6895dbf51d5619ae408ec143820353d1c2a5fa4a", kill_on_drop: false }`
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.08s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/ufmt_float-6de9111fef9c5b68
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests ufmt_float
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test src/lib.rs - (line 9) ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/lib.rs - (line 9) stdout ----
[INFO] [stdout] error[E0599]: no method named `do_as_formatter` found for mutable reference `&mut std::string::String` in the current scope
[INFO] [stdout]    --> src/lib.rs:15:1
[INFO] [stdout]     |
[INFO] [stdout] 9   |   uwriteln!(&mut s, "{}",pi_write).unwrap();
[INFO] [stdout]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ method not found in `&mut std::string::String`
[INFO] [stdout]     |
[INFO] [stdout]     = note: the method `do_as_formatter` exists but the following trait bounds were not satisfied:
[INFO] [stdout]             `std::string::String: ufmt::uWrite`
[INFO] [stdout]             which is required by `std::string::String: ufmt::UnstableDoAsFormatter`
[INFO] [stdout]             `&mut std::string::String: ufmt::uWrite`
[INFO] [stdout]             which is required by `&mut std::string::String: ufmt::UnstableDoAsFormatter`
[INFO] [stdout]             `str: ufmt::uWrite`
[INFO] [stdout]             which is required by `str: ufmt::UnstableDoAsFormatter`
[INFO] [stdout]     = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/lib.rs - (line 9)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr] error: test failed, to rerun pass '--doc'
[INFO] running `Command { std: "docker" "inspect" "7b0b6c964b5d920324a804bb6895dbf51d5619ae408ec143820353d1c2a5fa4a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7b0b6c964b5d920324a804bb6895dbf51d5619ae408ec143820353d1c2a5fa4a", kill_on_drop: false }`
[INFO] [stdout] 7b0b6c964b5d920324a804bb6895dbf51d5619ae408ec143820353d1c2a5fa4a