[INFO] fetching crate rust-bigint 1.2.0... [INFO] checking rust-bigint-1.2.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577 [INFO] extracting crate rust-bigint 1.2.0 into /workspace/builds/worker-3-tc2/source [INFO] started tweaking crates.io crate rust-bigint 1.2.0 [INFO] finished tweaking crates.io crate rust-bigint 1.2.0 [INFO] tweaked toml for crates.io crate rust-bigint 1.2.0 written to /workspace/builds/worker-3-tc2/source/Cargo.toml [INFO] validating manifest of crates.io crate rust-bigint 1.2.0 on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [INFO] [stderr] Locking 20 packages to latest compatible versions [INFO] [stderr] Adding getrandom v0.2.16 (available: v0.3.4) [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] d5af543b85c7043cecdcfa764dc2bffeecac1f4432fafacd78575d8c14422054 [INFO] running `Command { std: "docker" "start" "-a" "d5af543b85c7043cecdcfa764dc2bffeecac1f4432fafacd78575d8c14422054", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "d5af543b85c7043cecdcfa764dc2bffeecac1f4432fafacd78575d8c14422054", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "d5af543b85c7043cecdcfa764dc2bffeecac1f4432fafacd78575d8c14422054", kill_on_drop: false }` [INFO] [stdout] d5af543b85c7043cecdcfa764dc2bffeecac1f4432fafacd78575d8c14422054 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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 -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] bf2145fe826db3e8e7ba9700192fda6700ccd1daf2dd2dc4f4202db1faed558c [INFO] running `Command { std: "docker" "start" "-a" "bf2145fe826db3e8e7ba9700192fda6700ccd1daf2dd2dc4f4202db1faed558c", kill_on_drop: false }` [INFO] [stderr] Checking rust-gmp-kzen v0.5.1 [INFO] [stderr] Checking rust-bigint v1.2.0 (/opt/rustwide/workdir) [INFO] [stdout] error: this type will no longer be must used: Result [INFO] [stdout] --> src/serialize/bigint.rs:23:29 [INFO] [stdout] | [INFO] [stdout] 23 | let v: String = str::parse(s).map_err(de::Error::custom)?; [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: requested on the command line with `-D unmustuse-in-always-ok` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing [INFO] [stdout] --> src/big_gmp.rs:21:9 [INFO] [stdout] | [INFO] [stdout] 21 | drop(self); [INFO] [stdout] | ^^^^^----^ [INFO] [stdout] | | [INFO] [stdout] | argument has type `&mut Mpz` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dropping_references)]` on by default [INFO] [stdout] help: use `let _ = ...` to ignore the expression or result [INFO] [stdout] | [INFO] [stdout] 21 - drop(self); [INFO] [stdout] 21 + let _ = self; [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: call to `.borrow()` on a reference in this situation does nothing [INFO] [stdout] --> src/big_gmp.rs:29:35 [INFO] [stdout] | [INFO] [stdout] 29 | let bytes: Vec = value.borrow().into(); [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: the type `Mpz` does not implement `Borrow`, so calling `borrow` on `&Mpz` copies the reference, which does not do anything and can be removed [INFO] [stdout] = note: `#[warn(noop_method_call)]` on by default [INFO] [stdout] help: remove this redundant call [INFO] [stdout] | [INFO] [stdout] 29 - let bytes: Vec = value.borrow().into(); [INFO] [stdout] 29 + let bytes: Vec = value.into(); [INFO] [stdout] | [INFO] [stdout] help: if you meant to clone `Mpz`, implement `Clone` for it [INFO] [stdout] --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/rust-gmp-kzen-0.5.1/src/mpz.rs:110:1 [INFO] [stdout] | [INFO] [stdout] 110+ #[derive(Clone)] [INFO] [stdout] 111| pub struct Mpz { [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] error: could not compile `rust-bigint` (lib) due to 1 previous error; 2 warnings emitted [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] [stdout] error: this type will no longer be must used: Result [INFO] [stdout] --> src/serialize/bigint.rs:23:29 [INFO] [stdout] | [INFO] [stdout] 23 | let v: String = str::parse(s).map_err(de::Error::custom)?; [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: requested on the command line with `-D unmustuse-in-always-ok` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing [INFO] [stdout] --> src/big_gmp.rs:21:9 [INFO] [stdout] | [INFO] [stdout] 21 | drop(self); [INFO] [stdout] | ^^^^^----^ [INFO] [stdout] | | [INFO] [stdout] | argument has type `&mut Mpz` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dropping_references)]` on by default [INFO] [stdout] help: use `let _ = ...` to ignore the expression or result [INFO] [stdout] | [INFO] [stdout] 21 - drop(self); [INFO] [stdout] 21 + let _ = self; [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: call to `.borrow()` on a reference in this situation does nothing [INFO] [stdout] --> src/big_gmp.rs:29:35 [INFO] [stdout] | [INFO] [stdout] 29 | let bytes: Vec = value.borrow().into(); [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: the type `Mpz` does not implement `Borrow`, so calling `borrow` on `&Mpz` copies the reference, which does not do anything and can be removed [INFO] [stdout] = note: `#[warn(noop_method_call)]` on by default [INFO] [stdout] help: remove this redundant call [INFO] [stdout] | [INFO] [stdout] 29 - let bytes: Vec = value.borrow().into(); [INFO] [stdout] 29 + let bytes: Vec = value.into(); [INFO] [stdout] | [INFO] [stdout] help: if you meant to clone `Mpz`, implement `Clone` for it [INFO] [stdout] --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/rust-gmp-kzen-0.5.1/src/mpz.rs:110:1 [INFO] [stdout] | [INFO] [stdout] 110+ #[derive(Clone)] [INFO] [stdout] 111| pub struct Mpz { [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] error: could not compile `rust-bigint` (lib test) due to 1 previous error; 2 warnings emitted [INFO] running `Command { std: "docker" "inspect" "bf2145fe826db3e8e7ba9700192fda6700ccd1daf2dd2dc4f4202db1faed558c", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "bf2145fe826db3e8e7ba9700192fda6700ccd1daf2dd2dc4f4202db1faed558c", kill_on_drop: false }` [INFO] [stdout] bf2145fe826db3e8e7ba9700192fda6700ccd1daf2dd2dc4f4202db1faed558c