[INFO] cloning repository https://github.com/timmyjose-study/rust-mastery
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/timmyjose-study/rust-mastery" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftimmyjose-study%2Frust-mastery", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftimmyjose-study%2Frust-mastery'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4fa014b921b4c7539bbe83268bfcc8b1c9de952d
[INFO] checking timmyjose-study/rust-mastery against master#cb40c25f6aebb637163d26bf76a680ed6e5d1eda for pr-156157-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftimmyjose-study%2Frust-mastery" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/timmyjose-study/rust-mastery
[INFO] finished tweaking git repo https://github.com/timmyjose-study/rust-mastery
[INFO] tweaked toml for git repo https://github.com/timmyjose-study/rust-mastery written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/timmyjose-study/rust-mastery on toolchain cb40c25f6aebb637163d26bf76a680ed6e5d1eda
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cb40c25f6aebb637163d26bf76a680ed6e5d1eda" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/timmyjose-study/rust-mastery 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" "+cb40c25f6aebb637163d26bf76a680ed6e5d1eda" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr]   |
[INFO] [stderr]   = note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr]   = note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr]   = note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded wasm-bindgen-futures v0.4.30
[INFO] [stderr]   Downloaded proc-macro2 v1.0.37
[INFO] [stderr]   Downloaded wasm-bindgen-shared v0.2.80
[INFO] [stderr]   Downloaded async-global-executor v2.0.4
[INFO] [stderr]   Downloaded ctor v0.1.22
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[INFO] [stderr]   Downloaded wasm-bindgen-macro v0.2.80
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[INFO] [stderr]   Downloaded wasm-bindgen v0.2.80
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+cb40c25f6aebb637163d26bf76a680ed6e5d1eda" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1645ebc1cf82f14c11ca74db5ad9dfdd555ff4af4cba210d232303634894bcd6
[INFO] running `Command { std: "docker" "start" "-a" "1645ebc1cf82f14c11ca74db5ad9dfdd555ff4af4cba210d232303634894bcd6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1645ebc1cf82f14c11ca74db5ad9dfdd555ff4af4cba210d232303634894bcd6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1645ebc1cf82f14c11ca74db5ad9dfdd555ff4af4cba210d232303634894bcd6", kill_on_drop: false }`
[INFO] [stdout] 1645ebc1cf82f14c11ca74db5ad9dfdd555ff4af4cba210d232303634894bcd6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+cb40c25f6aebb637163d26bf76a680ed6e5d1eda" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] eb71bd66798eaf7ceea1d2571a960084365c35119fd3504c1a2e81feaf1f5d61
[INFO] running `Command { std: "docker" "start" "-a" "eb71bd66798eaf7ceea1d2571a960084365c35119fd3504c1a2e81feaf1f5d61", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr]   |
[INFO] [stderr]   = note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr]   = note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr]   = note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]    Compiling proc-macro2 v1.0.37
[INFO] [stderr]    Compiling syn v1.0.91
[INFO] [stderr]    Compiling futures-core v0.3.21
[INFO] [stderr]    Compiling libc v0.2.124
[INFO] [stderr]     Checking cache-padded v1.2.0
[INFO] [stderr]    Compiling log v0.4.16
[INFO] [stderr]     Checking fastrand v1.7.0
[INFO] [stderr]     Checking futures-io v0.3.21
[INFO] [stderr]     Checking event-listener v2.5.2
[INFO] [stderr]     Checking waker-fn v1.1.0
[INFO] [stderr]     Checking pin-project-lite v0.2.8
[INFO] [stderr]     Checking parking v2.0.0
[INFO] [stderr]    Compiling value-bag v1.0.0-alpha.8
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]     Checking once_cell v1.10.0
[INFO] [stderr]     Checking unicode-xid v0.2.2
[INFO] [stderr]     Checking concurrent-queue v1.2.2
[INFO] [stderr]     Checking async-task v4.2.0
[INFO] [stderr]     Checking slab v0.4.6
[INFO] [stderr]    Compiling crossbeam-utils v0.8.8
[INFO] [stderr]     Checking atomic-waker v1.0.0
[INFO] [stderr]     Checking async-mutex v1.4.0
[INFO] [stderr]     Checking async-lock v2.5.0
[INFO] [stderr]     Checking hello_macro v0.1.0 (/opt/rustwide/workdir/hello_macro)
[INFO] [stderr]     Checking interior-mutability v0.1.0 (/opt/rustwide/workdir/interior-mutability)
[INFO] [stderr]     Checking calling-c-from-rust v0.1.0 (/opt/rustwide/workdir/calling-c-from-rust)
[INFO] [stderr]     Checking too-many-linked-lists v0.1.0 (/opt/rustwide/workdir/too-many-linked-lists)
[INFO] [stderr]     Checking calling-rust-from-c v0.1.0 (/opt/rustwide/workdir/calling-rust-from-c)
[INFO] [stdout] warning: unused import: `std::cell::RefCell`
[INFO] [stdout]   --> interior-mutability/src/cell.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     use std::cell::RefCell;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]   --> interior-mutability/src/cell.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     use std::collections::HashMap;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]   --> interior-mutability/src/cell.rs:45:9
[INFO] [stdout]    |
[INFO] [stdout] 45 |     use std::rc::Rc;
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::cell::RefCell`
[INFO] [stdout]  --> interior-mutability/src/rc.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     use std::cell::RefCell;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> interior-mutability/src/rc.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     use std::rc::Rc;
[INFO] [stdout]   |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::Arc`
[INFO] [stdout]  --> interior-mutability/src/sync.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     use std::sync::Arc;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread`
[INFO] [stdout]  --> interior-mutability/src/sync.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     use std::thread;
[INFO] [stdout]   |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::time::Duration`
[INFO] [stdout]  --> interior-mutability/src/sync.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     use std::time::Duration;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Person` is never constructed
[INFO] [stdout]  --> interior-mutability/src/cell.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 |     struct Person {
[INFO] [stdout]   |            ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> interior-mutability/src/cell.rs:14:16
[INFO] [stdout]    |
[INFO] [stdout] 13 |     impl Person {
[INFO] [stdout]    |     ----------- associated function in this implementation
[INFO] [stdout] 14 |         pub fn new(name: &str, age: u16) -> Self {
[INFO] [stdout]    |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `birthday` is never used
[INFO] [stdout]   --> interior-mutability/src/cell.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 |     fn birthday(p: &Person) {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `name` is never read
[INFO] [stdout]  --> interior-mutability/src/cell.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     struct Person {
[INFO] [stdout]   |            ------ field in this struct
[INFO] [stdout] 9 |         name: String,
[INFO] [stdout]   |         ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Person` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `edges` is never read
[INFO] [stdout]   --> interior-mutability/src/cell.rs:72:17
[INFO] [stdout]    |
[INFO] [stdout] 71 |             struct Graph {
[INFO] [stdout]    |                    ----- field in this struct
[INFO] [stdout] 72 |                 edges: Vec<(i32, i32)>,
[INFO] [stdout]    |                 ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ArCee` is never constructed
[INFO] [stdout]   --> interior-mutability/src/cell.rs:98:20
[INFO] [stdout]    |
[INFO] [stdout] 98 |             struct ArCee<T: ?Sized> {
[INFO] [stdout]    |                    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ArCeeBox` is never constructed
[INFO] [stdout]    --> interior-mutability/src/cell.rs:103:20
[INFO] [stdout]     |
[INFO] [stdout] 103 |             struct ArCeeBox<T: ?Sized> {
[INFO] [stdout]     |                    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `ArCeeBoxPtr` is never used
[INFO] [stdout]    --> interior-mutability/src/cell.rs:119:19
[INFO] [stdout]     |
[INFO] [stdout] 119 |             trait ArCeeBoxPtr<T: ?Sized> {
[INFO] [stdout]     |                   ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `name` is never read
[INFO] [stdout]   --> interior-mutability/src/rc.rs:17:17
[INFO] [stdout]    |
[INFO] [stdout] 16 |             struct Owner {
[INFO] [stdout]    |                    ----- field in this struct
[INFO] [stdout] 17 |                 name: String,
[INFO] [stdout]    |                 ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Owner` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `id` is never read
[INFO] [stdout]   --> interior-mutability/src/rc.rs:22:17
[INFO] [stdout]    |
[INFO] [stdout] 21 |             struct Gadget {
[INFO] [stdout]    |                    ------ field in this struct
[INFO] [stdout] 22 |                 id: i32,
[INFO] [stdout]    |                 ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Gadget` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `name` is never read
[INFO] [stdout]   --> interior-mutability/src/rc.rs:48:17
[INFO] [stdout]    |
[INFO] [stdout] 47 |             struct Owner {
[INFO] [stdout]    |                    ----- field in this struct
[INFO] [stdout] 48 |                 name: String,
[INFO] [stdout]    |                 ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Owner` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `id` and `owner` are never read
[INFO] [stdout]   --> interior-mutability/src/rc.rs:54:17
[INFO] [stdout]    |
[INFO] [stdout] 53 |             struct Gadget {
[INFO] [stdout]    |                    ------ fields in this struct
[INFO] [stdout] 54 |                 id: i32,
[INFO] [stdout]    |                 ^^
[INFO] [stdout] 55 |                 owner: Rc<Owner>,
[INFO] [stdout]    |                 ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Gadget` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking async-channel v1.6.1
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> too-many-linked-lists/src/fourth.rs:101:23
[INFO] [stdout]     |
[INFO] [stdout] 101 |     pub fn peek_front(&self) -> Option<Ref<T>> {
[INFO] [stdout]     |                       ^^^^^            ^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                       |
[INFO] [stdout]     |                       the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 101 |     pub fn peek_front(&self) -> Option<Ref<'_, T>> {
[INFO] [stdout]     |                                            +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> too-many-linked-lists/src/fourth.rs:107:27
[INFO] [stdout]     |
[INFO] [stdout] 107 |     pub fn peek_front_mut(&self) -> Option<RefMut<T>> {
[INFO] [stdout]     |                           ^^^^^            ^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 107 |     pub fn peek_front_mut(&self) -> Option<RefMut<'_, T>> {
[INFO] [stdout]     |                                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> too-many-linked-lists/src/fourth.rs:113:22
[INFO] [stdout]     |
[INFO] [stdout] 113 |     pub fn peek_back(&self) -> Option<Ref<T>> {
[INFO] [stdout]     |                      ^^^^^            ^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                      |
[INFO] [stdout]     |                      the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 113 |     pub fn peek_back(&self) -> Option<Ref<'_, T>> {
[INFO] [stdout]     |                                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> too-many-linked-lists/src/fourth.rs:119:26
[INFO] [stdout]     |
[INFO] [stdout] 119 |     pub fn peek_back_mut(&self) -> Option<RefMut<T>> {
[INFO] [stdout]     |                          ^^^^^            ^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                          |
[INFO] [stdout]     |                          the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 119 |     pub fn peek_back_mut(&self) -> Option<RefMut<'_, T>> {
[INFO] [stdout]     |                                                  +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking futures-lite v1.12.0
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> too-many-linked-lists/src/fourth.rs:101:23
[INFO] [stdout]     |
[INFO] [stdout] 101 |     pub fn peek_front(&self) -> Option<Ref<T>> {
[INFO] [stdout]     |                       ^^^^^            ^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                       |
[INFO] [stdout]     |                       the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 101 |     pub fn peek_front(&self) -> Option<Ref<'_, T>> {
[INFO] [stdout]     |                                            +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> too-many-linked-lists/src/fourth.rs:107:27
[INFO] [stdout]     |
[INFO] [stdout] 107 |     pub fn peek_front_mut(&self) -> Option<RefMut<T>> {
[INFO] [stdout]     |                           ^^^^^            ^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 107 |     pub fn peek_front_mut(&self) -> Option<RefMut<'_, T>> {
[INFO] [stdout]     |                                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> too-many-linked-lists/src/fourth.rs:113:22
[INFO] [stdout]     |
[INFO] [stdout] 113 |     pub fn peek_back(&self) -> Option<Ref<T>> {
[INFO] [stdout]     |                      ^^^^^            ^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                      |
[INFO] [stdout]     |                      the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 113 |     pub fn peek_back(&self) -> Option<Ref<'_, T>> {
[INFO] [stdout]     |                                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> too-many-linked-lists/src/fourth.rs:119:26
[INFO] [stdout]     |
[INFO] [stdout] 119 |     pub fn peek_back_mut(&self) -> Option<RefMut<T>> {
[INFO] [stdout]     |                          ^^^^^            ^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                          |
[INFO] [stdout]     |                          the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 119 |     pub fn peek_back_mut(&self) -> Option<RefMut<'_, T>> {
[INFO] [stdout]     |                                                  +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking quote v1.0.18
[INFO] [stderr]     Checking socket2 v0.4.4
[INFO] [stderr]     Checking num_cpus v1.13.1
[INFO] [stderr]     Checking blocking v1.2.0
[INFO] [stderr]     Checking async-executor v1.4.1
[INFO] [stderr]     Checking single_command v0.1.0 (/opt/rustwide/workdir/single_command)
[INFO] [stderr]     Checking hello_macro_derive v0.1.0 (/opt/rustwide/workdir/hello_macro_derive)
[INFO] [stdout] error[E0532]: cannot match against a tuple struct which contains private fields
[INFO] [stdout]  --> single_command/src/lib.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 |     if let Ident(id) = tt.next() {
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout]   |
[INFO] [stdout] note: constructor is not visible here due to private fields
[INFO] [stdout]  --> single_command/src/lib.rs:9:18
[INFO] [stdout]   |
[INFO] [stdout] 9 |     if let Ident(id) = tt.next() {
[INFO] [stdout]   |                  ^^ private field
[INFO] [stdout] help: consider importing one of these tuple variants instead
[INFO] [stdout]   |
[INFO] [stdout] 1 + use crate::syn::Pat::Ident;
[INFO] [stdout]   |
[INFO] [stdout] 1 + use proc_macro::TokenTree::Ident;
[INFO] [stdout]   |
[INFO] [stdout] 1 + use syn::Pat::Ident;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0532]: cannot match against a tuple struct which contains private fields
[INFO] [stdout]   --> single_command/src/lib.rs:11:20
[INFO] [stdout]    |
[INFO] [stdout] 11 |             if let Literal(string) = tt.next() {
[INFO] [stdout]    |                    ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: constructor is not visible here due to private fields
[INFO] [stdout]   --> single_command/src/lib.rs:11:28
[INFO] [stdout]    |
[INFO] [stdout] 11 |             if let Literal(string) = tt.next() {
[INFO] [stdout]    |                            ^^^^^^ private field
[INFO] [stdout] help: consider importing this tuple variant instead
[INFO] [stdout]    |
[INFO] [stdout]  1 + use proc_macro::TokenTree::Literal;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `syn`
[INFO] [stdout]  --> single_command/src/lib.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use syn;
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0532`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `single_command` (lib test) due to 2 previous errors; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0532]: cannot match against a tuple struct which contains private fields
[INFO] [stdout]  --> single_command/src/lib.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 |     if let Ident(id) = tt.next() {
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout]   |
[INFO] [stdout] note: constructor is not visible here due to private fields
[INFO] [stdout]  --> single_command/src/lib.rs:9:18
[INFO] [stdout]   |
[INFO] [stdout] 9 |     if let Ident(id) = tt.next() {
[INFO] [stdout]   |                  ^^ private field
[INFO] [stdout] help: consider importing one of these tuple variants instead
[INFO] [stdout]   |
[INFO] [stdout] 1 + use crate::syn::Pat::Ident;
[INFO] [stdout]   |
[INFO] [stdout] 1 + use proc_macro::TokenTree::Ident;
[INFO] [stdout]   |
[INFO] [stdout] 1 + use syn::Pat::Ident;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0532]: cannot match against a tuple struct which contains private fields
[INFO] [stdout]   --> single_command/src/lib.rs:11:20
[INFO] [stdout]    |
[INFO] [stdout] 11 |             if let Literal(string) = tt.next() {
[INFO] [stdout]    |                    ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: constructor is not visible here due to private fields
[INFO] [stdout]   --> single_command/src/lib.rs:11:28
[INFO] [stdout]    |
[INFO] [stdout] 11 |             if let Literal(string) = tt.next() {
[INFO] [stdout]    |                            ^^^^^^ private field
[INFO] [stdout] help: consider importing this tuple variant instead
[INFO] [stdout]    |
[INFO] [stdout]  1 + use proc_macro::TokenTree::Literal;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `syn`
[INFO] [stdout]  --> single_command/src/lib.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use syn;
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0532`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `single_command` (lib) due to 2 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "eb71bd66798eaf7ceea1d2571a960084365c35119fd3504c1a2e81feaf1f5d61", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eb71bd66798eaf7ceea1d2571a960084365c35119fd3504c1a2e81feaf1f5d61", kill_on_drop: false }`
[INFO] [stdout] eb71bd66798eaf7ceea1d2571a960084365c35119fd3504c1a2e81feaf1f5d61
