[INFO] fetching crate iis2mdc 0.1.2...
[INFO] checking iis2mdc-0.1.2 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate iis2mdc 0.1.2 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate iis2mdc 0.1.2 on toolchain ceab6128fa48a616bfd3e3adf4bc80133b8ee223
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate iis2mdc 0.1.2
[INFO] finished tweaking crates.io crate iis2mdc 0.1.2
[INFO] tweaked toml for crates.io crate iis2mdc 0.1.2 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate crates.io crate iis2mdc 0.1.2 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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded fugit v0.3.6
[INFO] [stderr]   Downloaded embedded-dma v0.1.2
[INFO] [stderr]   Downloaded gcd v2.1.0
[INFO] [stderr]   Downloaded volatile-register v0.2.0
[INFO] [stderr]   Downloaded panic-semihosting v0.6.0
[INFO] [stderr]   Downloaded cortex-m-semihosting v0.5.0
[INFO] [stderr]   Downloaded bxcan v0.6.2
[INFO] [stderr]   Downloaded stm32l4xx-hal v0.7.1
[INFO] [stderr]   Downloaded stm32l4 v0.14.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2316d95be81a78fa07e7e7696143cd7104dd947954d125491504b7db2877944a
[INFO] running `Command { std: "docker" "start" "-a" "2316d95be81a78fa07e7e7696143cd7104dd947954d125491504b7db2877944a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2316d95be81a78fa07e7e7696143cd7104dd947954d125491504b7db2877944a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2316d95be81a78fa07e7e7696143cd7104dd947954d125491504b7db2877944a", kill_on_drop: false }`
[INFO] [stdout] 2316d95be81a78fa07e7e7696143cd7104dd947954d125491504b7db2877944a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5507fb330ac59a9e863d89ebe8824cd2b6a6432e0b9296dafe9adb8b6a515738
[INFO] running `Command { std: "docker" "start" "-a" "5507fb330ac59a9e863d89ebe8824cd2b6a6432e0b9296dafe9adb8b6a515738", kill_on_drop: false }`
[INFO] [stderr]     Checking nb v1.0.0
[INFO] [stderr]    Compiling syn v1.0.60
[INFO] [stderr]     Checking volatile-register v0.2.0
[INFO] [stderr]    Compiling cortex-m-rt v0.7.3
[INFO] [stderr]    Compiling cast v0.2.3
[INFO] [stderr]    Compiling stm32l4 v0.14.0
[INFO] [stderr]    Compiling cortex-m-semihosting v0.5.0
[INFO] [stderr]    Compiling paste v1.0.9
[INFO] [stderr]     Checking bare-metal v1.0.0
[INFO] [stderr]     Checking nb v0.1.3
[INFO] [stderr]     Checking embedded-hal v0.2.7
[INFO] [stderr]     Checking bxcan v0.6.2
[INFO] [stderr]     Checking embedded-dma v0.1.2
[INFO] [stderr]     Checking cortex-m v0.7.7
[INFO] [stderr]     Checking iis2mdc v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: method `read` is never used
[INFO] [stdout]   --> src/lib.rs:51:8
[INFO] [stdout]    |
[INFO] [stdout] 50 | trait Register {
[INFO] [stdout]    |       -------- method in this trait
[INFO] [stdout] 51 |     fn read<I2C>(&self, i2c: &mut I2C, reg_addr: u8) -> Result<u8, I2C::Error>
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking gcd v2.1.0
[INFO] [stderr]     Checking fugit v0.3.6
[INFO] [stderr]     Checking panic-semihosting v0.6.0
[INFO] [stderr]    Compiling cortex-m-rt-macros v0.7.0
[INFO] [stderr]     Checking stm32l4xx-hal v0.7.1
[INFO] [stdout] warning: method `read` is never used
[INFO] [stdout]   --> src/lib.rs:51:8
[INFO] [stdout]    |
[INFO] [stdout] 50 | trait Register {
[INFO] [stdout]    |       -------- method in this trait
[INFO] [stdout] 51 |     fn read<I2C>(&self, i2c: &mut I2C, reg_addr: u8) -> Result<u8, I2C::Error>
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 10.39s
[INFO] running `Command { std: "docker" "inspect" "5507fb330ac59a9e863d89ebe8824cd2b6a6432e0b9296dafe9adb8b6a515738", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5507fb330ac59a9e863d89ebe8824cd2b6a6432e0b9296dafe9adb8b6a515738", kill_on_drop: false }`
[INFO] [stdout] 5507fb330ac59a9e863d89ebe8824cd2b6a6432e0b9296dafe9adb8b6a515738
[INFO] checking iis2mdc-0.1.2 against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] extracting crate iis2mdc 0.1.2 into /workspace/builds/worker-4-tc2/source
[INFO] validating manifest of crates.io crate iis2mdc 0.1.2 on toolchain 3a4bc97f6385a3aa300a4fd689b44350e54fd676
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate iis2mdc 0.1.2
[INFO] finished tweaking crates.io crate iis2mdc 0.1.2
[INFO] tweaked toml for crates.io crate iis2mdc 0.1.2 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate crates.io crate iis2mdc 0.1.2 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" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c8b1e591fbe483ef68c2ddc093e9d43a7897a7e2f6ec58dfb003fec8a9650eb6
[INFO] running `Command { std: "docker" "start" "-a" "c8b1e591fbe483ef68c2ddc093e9d43a7897a7e2f6ec58dfb003fec8a9650eb6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c8b1e591fbe483ef68c2ddc093e9d43a7897a7e2f6ec58dfb003fec8a9650eb6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c8b1e591fbe483ef68c2ddc093e9d43a7897a7e2f6ec58dfb003fec8a9650eb6", kill_on_drop: false }`
[INFO] [stdout] c8b1e591fbe483ef68c2ddc093e9d43a7897a7e2f6ec58dfb003fec8a9650eb6
[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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ff56e4b2dda4e654c8c53bcf8f9c283c53d5c0954cb08acce1d6b1a15a3dd188
[INFO] running `Command { std: "docker" "start" "-a" "ff56e4b2dda4e654c8c53bcf8f9c283c53d5c0954cb08acce1d6b1a15a3dd188", kill_on_drop: false }`
[INFO] [stderr]     Checking nb v1.0.0
[INFO] [stderr]    Compiling syn v1.0.60
[INFO] [stderr]     Checking volatile-register v0.2.0
[INFO] [stderr]    Compiling cortex-m-rt v0.7.3
[INFO] [stderr]    Compiling cast v0.2.3
[INFO] [stderr]    Compiling cortex-m-semihosting v0.5.0
[INFO] [stderr]    Compiling stm32l4 v0.14.0
[INFO] [stderr]    Compiling paste v1.0.9
[INFO] [stderr]     Checking bare-metal v1.0.0
[INFO] [stderr]     Checking nb v0.1.3
[INFO] [stderr]     Checking bxcan v0.6.2
[INFO] [stderr]     Checking embedded-hal v0.2.7
[INFO] [stderr]     Checking cortex-m v0.7.7
[INFO] [stderr]     Checking embedded-dma v0.1.2
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking iis2mdc v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0284]: type annotations needed: cannot satisfy `_ -> _`
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/cortex-m-0.7.7/src/call_asm.rs:19:21
[INFO] [stdout]     |
[INFO] [stdout] 19  |                     $func($($args),*)
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^ cannot satisfy `_ -> _`
[INFO] [stdout]     |
[INFO] [stdout]    ::: /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/cortex-m-0.7.7/src/asm.rs:189:5
[INFO] [stdout]     |
[INFO] [stdout] 189 |     call_asm!(__bootstrap(msp: u32, rv: u32) -> !);
[INFO] [stdout]     |     ---------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `call_asm` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0284`.
[INFO] [stdout] 
[INFO] [stdout] warning: method `read` is never used
[INFO] [stdout]   --> src/lib.rs:51:8
[INFO] [stdout]    |
[INFO] [stdout] 50 | trait Register {
[INFO] [stdout]    |       -------- method in this trait
[INFO] [stdout] 51 |     fn read<I2C>(&self, i2c: &mut I2C, reg_addr: u8) -> Result<u8, I2C::Error>
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `cortex-m` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "ff56e4b2dda4e654c8c53bcf8f9c283c53d5c0954cb08acce1d6b1a15a3dd188", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ff56e4b2dda4e654c8c53bcf8f9c283c53d5c0954cb08acce1d6b1a15a3dd188", kill_on_drop: false }`
[INFO] [stdout] ff56e4b2dda4e654c8c53bcf8f9c283c53d5c0954cb08acce1d6b1a15a3dd188