[INFO] fetching crate exact-float 0.1.1...
[INFO] testing exact-float-0.1.1 against 1.55.0 for beta-1.56-1
[INFO] extracting crate exact-float 0.1.1 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate exact-float 0.1.1 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate exact-float 0.1.1
[INFO] finished tweaking crates.io crate exact-float 0.1.1
[INFO] tweaked toml for crates.io crate exact-float 0.1.1 written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b1a1bf3f87de8e567d37ef607ad2c9c9dec8588a6bf534def2dc9eeab1c23be8
[INFO] running `Command { std: "docker" "start" "-a" "b1a1bf3f87de8e567d37ef607ad2c9c9dec8588a6bf534def2dc9eeab1c23be8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b1a1bf3f87de8e567d37ef607ad2c9c9dec8588a6bf534def2dc9eeab1c23be8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b1a1bf3f87de8e567d37ef607ad2c9c9dec8588a6bf534def2dc9eeab1c23be8", kill_on_drop: false }`
[INFO] [stdout] b1a1bf3f87de8e567d37ef607ad2c9c9dec8588a6bf534def2dc9eeab1c23be8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c0f861cb6405532ea8babec389c9be466e5c1bbe95cb4bc5cbf24e6fda76c6be
[INFO] running `Command { std: "docker" "start" "-a" "c0f861cb6405532ea8babec389c9be466e5c1bbe95cb4bc5cbf24e6fda76c6be", kill_on_drop: false }`
[INFO] [stderr]    Compiling exact-float v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(float_extras)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `integer_decode` found for type `f32` in the current scope
[INFO] [stdout]   --> src/lib.rs:57:47
[INFO] [stdout]    |
[INFO] [stdout] 57 |         let (mantissa, exponent, sign) = self.integer_decode();
[INFO] [stdout]    |                                               ^^^^^^^^^^^^^^ method not found in `f32`
[INFO] [stdout]    |
[INFO] [stdout]    = help: items from traits can only be used if the trait is in scope
[INFO] [stdout] help: the following traits are implemented but not in scope; perhaps add a `use` for one of them:
[INFO] [stdout]    |
[INFO] [stdout] 4  | use core::num::dec2flt::float::RawFloat;
[INFO] [stdout]    |
[INFO] [stdout] 4  | use num::traits::float::FloatCore;
[INFO] [stdout]    |
[INFO] [stdout] 4  | use num::Float;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `integer_decode` found for type `f64` in the current scope
[INFO] [stdout]   --> src/lib.rs:73:47
[INFO] [stdout]    |
[INFO] [stdout] 73 |         let (mantissa, exponent, sign) = self.integer_decode();
[INFO] [stdout]    |                                               ^^^^^^^^^^^^^^ method not found in `f64`
[INFO] [stdout]    |
[INFO] [stdout]    = help: items from traits can only be used if the trait is in scope
[INFO] [stdout] help: the following traits are implemented but not in scope; perhaps add a `use` for one of them:
[INFO] [stdout]    |
[INFO] [stdout] 4  | use core::num::dec2flt::float::RawFloat;
[INFO] [stdout]    |
[INFO] [stdout] 4  | use num::traits::float::FloatCore;
[INFO] [stdout]    |
[INFO] [stdout] 4  | use num::Float;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `exact-float` due to 4 previous errors
[INFO] running `Command { std: "docker" "inspect" "c0f861cb6405532ea8babec389c9be466e5c1bbe95cb4bc5cbf24e6fda76c6be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c0f861cb6405532ea8babec389c9be466e5c1bbe95cb4bc5cbf24e6fda76c6be", kill_on_drop: false }`
[INFO] [stdout] c0f861cb6405532ea8babec389c9be466e5c1bbe95cb4bc5cbf24e6fda76c6be