[INFO] updating cached repository https://github.com/zhangrxiang/hello-rust [INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"` [INFO] running `"git" "rev-parse" "HEAD"` [INFO] [stdout] e242892285f44bc2e96e0207b0cb63f7ef25f149 [INFO] checking zhangrxiang/hello-rust against master#ba72b15666b2491415aec703a02c2364fe5e2790 for pr-71140 [INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzhangrxiang%2Fhello-rust" "/workspace/builds/worker-12/source"` [INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/zhangrxiang/hello-rust on toolchain ba72b15666b2491415aec703a02c2364fe5e2790 [INFO] running `"/workspace/cargo-home/bin/cargo" "+ba72b15666b2491415aec703a02c2364fe5e2790" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] started tweaking git repo https://github.com/zhangrxiang/hello-rust [INFO] finished tweaking git repo https://github.com/zhangrxiang/hello-rust [INFO] tweaked toml for git repo https://github.com/zhangrxiang/hello-rust written to /workspace/builds/worker-12/source/Cargo.toml [INFO] crate git repo https://github.com/zhangrxiang/hello-rust already has a lockfile, it will not be regenerated [INFO] running `"/workspace/cargo-home/bin/cargo" "+ba72b15666b2491415aec703a02c2364fe5e2790" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] running `"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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-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" "/opt/rustwide/cargo-home/bin/cargo" "+ba72b15666b2491415aec703a02c2364fe5e2790" "check" "--frozen" "--all" "--all-targets"` [INFO] [stdout] d1a932765cee3933583b69fda85922d9712868ef821785d68d933d0ca838b9a5 [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] running `"docker" "start" "-a" "d1a932765cee3933583b69fda85922d9712868ef821785d68d933d0ca838b9a5"` [INFO] [stderr] Compiling cc v1.0.47 [INFO] [stderr] Checking atty v0.2.13 [INFO] [stderr] Checking rand v0.3.23 [INFO] [stderr] Compiling rust-crypto v0.2.36 [INFO] [stderr] Checking clap v2.33.0 [INFO] [stderr] Compiling backtrace-sys v0.1.32 [INFO] [stderr] Checking backtrace v0.3.40 [INFO] [stderr] Checking error-chain v0.10.0 [INFO] [stderr] Checking ferris-says v0.1.1 [INFO] [stderr] Checking hello-rust v0.1.0 (/opt/rustwide/workdir) [INFO] [stderr] warning: unused label [INFO] [stderr] --> src/learn/flow_control.rs:62:9 [INFO] [stderr] | [INFO] [stderr] 62 | 'inner: loop { [INFO] [stderr] | ^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_labels)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused import: `learn::net` [INFO] [stderr] --> src/main.rs:176:9 [INFO] [stderr] | [INFO] [stderr] 176 | use learn::net; [INFO] [stderr] | ^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_imports)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused label [INFO] [stderr] --> src/learn/flow_control.rs:62:9 [INFO] [stderr] | [INFO] [stderr] 62 | 'inner: loop { [INFO] [stderr] | ^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_labels)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused import: `io` [INFO] [stderr] --> src/learn/fs.rs:3:19 [INFO] [stderr] | [INFO] [stderr] 3 | use std::{fs, io}; [INFO] [stderr] | ^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_imports)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused import: `DirEntry` [INFO] [stderr] --> src/learn/fs.rs:5:19 [INFO] [stderr] | [INFO] [stderr] 5 | use std::fs::{DirEntry, File, OpenOptions}; [INFO] [stderr] | ^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused import: `std::path::Path` [INFO] [stderr] --> src/learn/fs.rs:8:9 [INFO] [stderr] | [INFO] [stderr] 8 | use std::path::Path; [INFO] [stderr] | ^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused import: `core::result::Result as CoreResult` [INFO] [stderr] --> src/learn/macros.rs:4:9 [INFO] [stderr] | [INFO] [stderr] 4 | use core::result::Result as CoreResult; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused import: `std::io` [INFO] [stderr] --> src/learn/demo.rs:3:9 [INFO] [stderr] | [INFO] [stderr] 3 | use std::io; [INFO] [stderr] | ^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused import: `learn::net` [INFO] [stderr] --> src/main.rs:176:9 [INFO] [stderr] | [INFO] [stderr] 176 | use learn::net; [INFO] [stderr] | ^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: multiple patterns covering the same range [INFO] [stderr] --> src/learn/match_test.rs:15:9 [INFO] [stderr] | [INFO] [stderr] 14 | 13...39 => println!("A teen"), [INFO] [stderr] | ------- this range overlaps on `39u8` [INFO] [stderr] 15 | 39..=90 => println!("B teen"), [INFO] [stderr] | ^^^^^^^ overlapping patterns [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(overlapping_patterns)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused import: `std::fmt::Write` [INFO] [stderr] --> src/learn/macros.rs:6:9 [INFO] [stderr] | [INFO] [stderr] 6 | use std::fmt::Write as FmtWrite; [INFO] [stderr] | ^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: multiple patterns covering the same range [INFO] [stderr] --> src/learn/match_test.rs:15:9 [INFO] [stderr] | [INFO] [stderr] 14 | 13...39 => println!("A teen"), [INFO] [stderr] | ------- this range overlaps on `39u8` [INFO] [stderr] 15 | 39..=90 => println!("B teen"), [INFO] [stderr] | ^^^^^^^ overlapping patterns [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(overlapping_patterns)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `result` [INFO] [stderr] --> src/learn/net2.rs:35:17 [INFO] [stderr] | [INFO] [stderr] 35 | let result = match stream.read(&mut buf2) { [INFO] [stderr] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `err` [INFO] [stderr] --> src/learn/net2.rs:40:21 [INFO] [stderr] | [INFO] [stderr] 40 | Err(err) => { [INFO] [stderr] | ^^^ help: if this is intentional, prefix it with an underscore: `_err` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `larger` [INFO] [stderr] --> src/learn/test.rs:26:13 [INFO] [stderr] | [INFO] [stderr] 26 | let larger = Rectangle { width: 8, height: 7 }; [INFO] [stderr] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_larger` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `f` [INFO] [stderr] --> src/learn/fs.rs:39:13 [INFO] [stderr] | [INFO] [stderr] 39 | let mut f = File::create("foo.txt")?; [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `file` [INFO] [stderr] --> src/learn/fs.rs:45:13 [INFO] [stderr] | [INFO] [stderr] 45 | let file = OpenOptions::new().read(true).open("foo.txt"); [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_file` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `perms` [INFO] [stderr] --> src/learn/fs.rs:119:13 [INFO] [stderr] | [INFO] [stderr] 119 | let mut perms = file.metadata()?.permissions(); [INFO] [stderr] | ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_perms` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `attr` [INFO] [stderr] --> src/learn/fs.rs:364:13 [INFO] [stderr] | [INFO] [stderr] 364 | let attr = fs::metadata("/some/file/path.txt")?; [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_attr` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `attr` [INFO] [stderr] --> src/learn/fs.rs:371:13 [INFO] [stderr] | [INFO] [stderr] 371 | let attr = fs::symlink_metadata("symlink.txt")?; [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_attr` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `file` [INFO] [stderr] --> src/learn/fs.rs:132:17 [INFO] [stderr] | [INFO] [stderr] 132 | let file = options.read(true).open("foo.txt"); [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_file` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `file` [INFO] [stderr] --> src/learn/fs.rs:137:17 [INFO] [stderr] | [INFO] [stderr] 137 | let file = OpenOptions::new().read(true).open("foo.txt"); [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_file` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `file` [INFO] [stderr] --> src/learn/fs.rs:142:17 [INFO] [stderr] | [INFO] [stderr] 142 | let file = OpenOptions::new().write(true).open("foo.txt"); [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_file` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `file` [INFO] [stderr] --> src/learn/fs.rs:147:17 [INFO] [stderr] | [INFO] [stderr] 147 | let file = OpenOptions::new().append(true).open("foo.txt"); [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_file` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `file` [INFO] [stderr] --> src/learn/fs.rs:152:17 [INFO] [stderr] | [INFO] [stderr] 152 | let file = OpenOptions::new().truncate(true).open("foo.txt"); [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_file` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `file` [INFO] [stderr] --> src/learn/fs.rs:157:17 [INFO] [stderr] | [INFO] [stderr] 157 | let file = OpenOptions::new().create(true).open("foo.txt"); [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_file` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `file` [INFO] [stderr] --> src/learn/fs.rs:162:17 [INFO] [stderr] | [INFO] [stderr] 162 | let file = OpenOptions::new().write(true) [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_file` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s2` [INFO] [stderr] --> src/learn/macros.rs:192:13 [INFO] [stderr] | [INFO] [stderr] 192 | let s2 = format_args!("hello {}", "world"); [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_s2` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `buffer2` [INFO] [stderr] --> src/learn/io.rs:28:13 [INFO] [stderr] | [INFO] [stderr] 28 | let mut buffer2 = String::from("hello world"); [INFO] [stderr] | ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_buffer2` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/learn/net2.rs:11:13 [INFO] [stderr] | [INFO] [stderr] 11 | let mut sparkle_heart = vec![70]; [INFO] [stderr] | ----^^^^^^^^^^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_mut)]` on by default [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/learn/net2.rs:31:21 [INFO] [stderr] | [INFO] [stderr] 31 | let mut buf = [66, 67, 68, 69, 70]; [INFO] [stderr] | ----^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/learn/fs.rs:39:13 [INFO] [stderr] | [INFO] [stderr] 39 | let mut f = File::create("foo.txt")?; [INFO] [stderr] | ----^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/learn/fs.rs:85:13 [INFO] [stderr] | [INFO] [stderr] 85 | let mut f = File::create("foo.txt")?; [INFO] [stderr] | ----^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/learn/fs.rs:92:13 [INFO] [stderr] | [INFO] [stderr] 92 | let mut f = File::open("foo.txt")?; [INFO] [stderr] | ----^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/learn/fs.rs:109:13 [INFO] [stderr] | [INFO] [stderr] 109 | let mut file = File::open("foo.txt")?; [INFO] [stderr] | ----^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/learn/fs.rs:119:13 [INFO] [stderr] | [INFO] [stderr] 119 | let mut perms = file.metadata()?.permissions(); [INFO] [stderr] | ----^^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/learn/fs.rs:246:17 [INFO] [stderr] | [INFO] [stderr] 246 | let mut f = File::create("foo.txt")?; [INFO] [stderr] | ----^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: 3 warnings emitted [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/learn/io.rs:28:13 [INFO] [stderr] | [INFO] [stderr] 28 | let mut buffer2 = String::from("hello world"); [INFO] [stderr] | ----^^^^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: unused attribute [INFO] [stderr] --> src/learn/net2.rs:30:13 [INFO] [stderr] | [INFO] [stderr] 30 | #[derive(Debug)] [INFO] [stderr] | ^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_attributes)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused attribute [INFO] [stderr] --> src/learn/net2.rs:32:13 [INFO] [stderr] | [INFO] [stderr] 32 | #[derive(Debug)] [INFO] [stderr] | ^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/learn/net2.rs:26:9 [INFO] [stderr] | [INFO] [stderr] 26 | stream.set_read_timeout(Some(Duration::new(0, 0))); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_must_use)]` on by default [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/learn/net2.rs:27:9 [INFO] [stderr] | [INFO] [stderr] 27 | stream.set_write_timeout(Some(Duration::new(0, 0))); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/learn/net2.rs:34:13 [INFO] [stderr] | [INFO] [stderr] 34 | stream.write(&buf); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/learn/fs.rs:357:9 [INFO] [stderr] | [INFO] [stderr] 357 | fs::write("a.txt", "test"); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/learn/macros.rs:124:9 [INFO] [stderr] | [INFO] [stderr] 124 | write(); [INFO] [stderr] | ^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/learn/macros.rs:128:9 [INFO] [stderr] | [INFO] [stderr] 128 | write!(&mut s, "{} {}", "abc", 123); // uses fmt::Write::write_fmt [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/learn/macros.rs:129:9 [INFO] [stderr] | [INFO] [stderr] 129 | write!(&mut v, "s = {:?}", s); // uses io::Write::write_fmt [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/learn/macros.rs:155:9 [INFO] [stderr] | [INFO] [stderr] 155 | main(); [INFO] [stderr] | ^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/learn/macros.rs:165:9 [INFO] [stderr] | [INFO] [stderr] 165 | main2(); [INFO] [stderr] | ^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] warning: 46 warnings emitted [INFO] [stderr] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 17.77s [INFO] running `"docker" "inspect" "d1a932765cee3933583b69fda85922d9712868ef821785d68d933d0ca838b9a5"` [INFO] running `"docker" "rm" "-f" "d1a932765cee3933583b69fda85922d9712868ef821785d68d933d0ca838b9a5"` [INFO] [stdout] d1a932765cee3933583b69fda85922d9712868ef821785d68d933d0ca838b9a5