[INFO] cloning repository https://github.com/xsoer/rust-examples
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/xsoer/rust-examples" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxsoer%2Frust-examples", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxsoer%2Frust-examples'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] bfc231c472eb7c392b91dca324cee79819cd3a7a
[INFO] checking xsoer/rust-examples against master#4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5 for pr-81174
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxsoer%2Frust-examples" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/xsoer/rust-examples on toolchain 4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/xsoer/rust-examples
[INFO] finished tweaking git repo https://github.com/xsoer/rust-examples
[INFO] tweaked toml for git repo https://github.com/xsoer/rust-examples written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "rustops/crates-build-env@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 32d6c32bd133c2369378262274658422995a3283164882f7773b7249588ebd1e
[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" "32d6c32bd133c2369378262274658422995a3283164882f7773b7249588ebd1e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "32d6c32bd133c2369378262274658422995a3283164882f7773b7249588ebd1e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "32d6c32bd133c2369378262274658422995a3283164882f7773b7249588ebd1e", kill_on_drop: false }`
[INFO] [stdout] 32d6c32bd133c2369378262274658422995a3283164882f7773b7249588ebd1e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2751fb4d483b870e45bee06f6ab6887398d8f99252760b3ab406a30b9cdba16d
[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" "2751fb4d483b870e45bee06f6ab6887398d8f99252760b3ab406a30b9cdba16d", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.60
[INFO] [stderr]    Compiling libc v0.2.84
[INFO] [stderr]    Compiling serde_derive v1.0.123
[INFO] [stderr]    Compiling serde v1.0.123
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]     Checking once_cell v1.5.2
[INFO] [stderr]     Checking futures-core v0.3.12
[INFO] [stderr]    Compiling value-bag v1.0.0-alpha.6
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]     Checking pin-project-lite v0.2.4
[INFO] [stderr]     Checking futures-io v0.3.12
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]    Compiling proc-macro-hack v0.5.19
[INFO] [stderr]     Checking futures-sink v0.3.12
[INFO] [stderr]    Compiling proc-macro-nested v0.1.7
[INFO] [stderr]     Checking cache-padded v1.1.1
[INFO] [stderr]     Checking waker-fn v1.1.0
[INFO] [stderr]     Checking fastrand v1.4.0
[INFO] [stderr]     Checking bytes v0.5.6
[INFO] [stderr]    Compiling const_fn v0.4.5
[INFO] [stderr]     Checking parking v2.0.0
[INFO] [stderr]     Checking event-listener v2.5.1
[INFO] [stderr]     Checking pin-project-lite v0.1.11
[INFO] [stderr]    Compiling rayon-core v1.9.0
[INFO] [stderr]     Checking async-task v4.0.3
[INFO] [stderr]     Checking vec-arena v1.0.0
[INFO] [stderr]     Checking itoa v0.4.7
[INFO] [stderr]     Checking atomic-waker v1.0.0
[INFO] [stderr]     Checking regex-syntax v0.6.22
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling serde_json v1.0.61
[INFO] [stderr]     Checking adler32 v1.2.0
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking unicode-width v0.1.8
[INFO] [stderr]    Compiling crc32fast v1.2.1
[INFO] [stderr]     Checking adler v0.2.3
[INFO] [stderr]     Checking vec_map v0.8.2
[INFO] [stderr]     Checking termcolor v1.1.2
[INFO] [stderr]     Checking strsim v0.8.0
[INFO] [stderr]     Checking ansi_term v0.11.0
[INFO] [stderr]     Checking percent-encoding v2.1.0
[INFO] [stderr]     Checking weezl v0.1.3
[INFO] [stderr]     Checking humantime v2.1.0
[INFO] [stderr]     Checking color_quant v1.1.0
[INFO] [stderr]     Checking bytes v1.0.1
[INFO] [stderr]     Checking bytemuck v1.5.0
[INFO] [stderr]     Checking sha1 v0.6.0
[INFO] [stderr]     Checking dtoa v0.4.7
[INFO] [stderr]     Checking eg_basic v0.1.0 (/opt/rustwide/workdir/ex-basic)
[INFO] [stderr]    Compiling crossbeam-utils v0.8.1
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> ex-basic/src/thread/thread1.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     for i in 0..10 {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> ex-basic/src/thread/thread1.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn th4(i: u8) {
[INFO] [stdout]    |        ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `th1`
[INFO] [stdout]  --> ex-basic/src/thread/thread1.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn th1() -> bool {
[INFO] [stdout]   |    ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `th2`
[INFO] [stdout]   --> ex-basic/src/thread/thread1.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn th2(i: u8) -> u8 {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `th3`
[INFO] [stdout]   --> ex-basic/src/thread/thread1.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn th3(i: u8) -> bool {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `th4`
[INFO] [stdout]   --> ex-basic/src/thread/thread1.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn th4(i: u8) {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `th5`
[INFO] [stdout]   --> ex-basic/src/thread/thread1.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn th5() -> bool {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `lcs`
[INFO] [stdout]  --> ex-basic/src/algorithm/lcs.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn lcs(l: String, r: String) -> usize {
[INFO] [stdout]   |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_lcs`
[INFO] [stdout]   --> ex-basic/src/algorithm/lcs.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn test_lcs() -> usize {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> ex-basic/src/thread/thread1.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     for i in 0..10 {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling memoffset v0.6.1
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> ex-basic/src/thread/thread1.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn th4(i: u8) {
[INFO] [stdout]    |        ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling rayon v1.5.0
[INFO] [stderr]    Compiling miniz_oxide v0.4.3
[INFO] [stdout] warning: function is never used: `th4`
[INFO] [stdout]   --> ex-basic/src/thread/thread1.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn th4(i: u8) {
[INFO] [stdout]    |    ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `th5`
[INFO] [stdout]   --> ex-basic/src/thread/thread1.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn th5() -> bool {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling num-rational v0.3.2
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> ex-basic/src/thread/thread1.rs:40:5
[INFO] [stdout]    |
[INFO] [stdout] 40 |     handle.join();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]     Checking futures-channel v0.3.12
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> ex-basic/src/thread/thread1.rs:40:5
[INFO] [stdout]    |
[INFO] [stdout] 40 |     handle.join();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling cmake v0.1.45
[INFO] [stderr]     Checking futures-task v0.3.12
[INFO] [stderr]     Checking thread_local v1.1.2
[INFO] [stderr]     Checking concurrent-queue v1.2.2
[INFO] [stderr]    Compiling libz-sys v1.1.2
[INFO] [stderr]     Checking async-mutex v1.4.0
[INFO] [stderr]     Checking async-lock v2.3.0
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking miniz_oxide v0.3.7
[INFO] [stderr]     Checking deflate v0.8.6
[INFO] [stderr]     Checking form_urlencoded v1.0.0
[INFO] [stderr]     Checking gif v0.11.1
[INFO] [stdout] error[E0425]: cannot find value `i` in this scope
[INFO] [stdout]   --> ex-basic/src/main.rs:47:20
[INFO] [stdout]    |
[INFO] [stdout] 47 |     println!("{}", i)
[INFO] [stdout]    |                    ^ help: a local variable with a similar name exists: `a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find function `thread_rng` in this scope
[INFO] [stdout]   --> ex-basic/src/main.rs:98:19
[INFO] [stdout]    |
[INFO] [stdout] 98 |     let mut rng = thread_rng();
[INFO] [stdout]    |                   ^^^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'assoc_char_funcs': recently added
[INFO] [stdout]   --> ex-basic/src/main.rs:91:17
[INFO] [stdout]    |
[INFO] [stdout] 91 |         let c = char::from_u32(i);
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #71763 <https://github.com/rust-lang/rust/issues/71763> for more information
[INFO] [stdout]    = help: add `#![feature(assoc_char_funcs)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find value `i` in this scope
[INFO] [stdout]   --> ex-basic/src/main.rs:47:20
[INFO] [stdout]    |
[INFO] [stdout] 47 |     println!("{}", i)
[INFO] [stdout]    |                    ^ help: a local variable with a similar name exists: `a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find function `thread_rng` in this scope
[INFO] [stdout]   --> ex-basic/src/main.rs:98:19
[INFO] [stdout]    |
[INFO] [stdout] 98 |     let mut rng = thread_rng();
[INFO] [stdout]    |                   ^^^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0425, E0658.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0425`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `eg_basic`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0658]: use of unstable library feature 'assoc_char_funcs': recently added
[INFO] [stdout]   --> ex-basic/src/main.rs:91:17
[INFO] [stdout]    |
[INFO] [stdout] 91 |         let c = char::from_u32(i);
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #71763 <https://github.com/rust-lang/rust/issues/71763> for more information
[INFO] [stdout]    = help: add `#![feature(assoc_char_funcs)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0425, E0658.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0425`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "2751fb4d483b870e45bee06f6ab6887398d8f99252760b3ab406a30b9cdba16d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2751fb4d483b870e45bee06f6ab6887398d8f99252760b3ab406a30b9cdba16d", kill_on_drop: false }`
[INFO] [stdout] 2751fb4d483b870e45bee06f6ab6887398d8f99252760b3ab406a30b9cdba16d