[INFO] cloning repository https://github.com/jhessin/rust-playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jhessin/rust-playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjhessin%2Frust-playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjhessin%2Frust-playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 397b7bd83e6113231faf031cd9044b859b62a79a
[INFO] fixing jhessin/rust-playground against try#622891a4e29178280638a6b63a8908bde2c0c854+cargoflags=-Zfix-edition=end=2015,2024 for pr-157817-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjhessin%2Frust-playground" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/jhessin/rust-playground
[INFO] finished tweaking git repo https://github.com/jhessin/rust-playground
[INFO] tweaked toml for git repo https://github.com/jhessin/rust-playground written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/jhessin/rust-playground on toolchain 622891a4e29178280638a6b63a8908bde2c0c854
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+622891a4e29178280638a6b63a8908bde2c0c854" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/jhessin/rust-playground 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" "+622891a4e29178280638a6b63a8908bde2c0c854" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/source:/opt/rustwide/workdir:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3a6becf2bc8dde7f3fa57ede90e4f284e72d296796fc446bbb1e2c7cc0530151" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 416c15b29733811f4f028d6902f0a5aca27d5c8626030a4a867cdfb9b06a8574
[INFO] running `Command { std: "docker" "start" "416c15b29733811f4f028d6902f0a5aca27d5c8626030a4a867cdfb9b06a8574", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "416c15b29733811f4f028d6902f0a5aca27d5c8626030a4a867cdfb9b06a8574" "/opt/rustwide/cargo-home/bin/cargo" "+622891a4e29178280638a6b63a8908bde2c0c854" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "416c15b29733811f4f028d6902f0a5aca27d5c8626030a4a867cdfb9b06a8574", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=" "-e" "RUSTDOCFLAGS=" "-w" "/opt/rustwide/workdir" "--user" "0:0" "416c15b29733811f4f028d6902f0a5aca27d5c8626030a4a867cdfb9b06a8574" "/opt/rustwide/cargo-home/bin/cargo" "+622891a4e29178280638a6b63a8908bde2c0c854" "fix" "--allow-no-vcs" "--allow-dirty" "--frozen" "--all" "--all-targets" "--message-format=json" "-Zfix-edition=end=2015,2024", kill_on_drop: false }`
[INFO] [stderr] crater-edition-check: migrating to next edition
[INFO] [stderr]    Migrating blog/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch15-4/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch15-5/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch15-6/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch16-1-threads/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch16-2-messages/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch16-3-mutex/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch17-2/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch17-3/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch18-1/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch18-2/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch18-3/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch19-1/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch19-2/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch19-3/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch19-4/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch19-6/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating hello_macro/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating hello_macro_derive/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating custom-smart-ptr/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating smart-ptrs/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]     Checking hello_macro v0.1.0 (/opt/rustwide/workdir/hello_macro)
[INFO] [stderr]     Checking blog v0.1.0 (/opt/rustwide/workdir/blog)
[INFO] [stderr]     Checking ch17-2 v0.1.0 (/opt/rustwide/workdir/ch17-2)
[INFO] [stderr]    Migrating hello_macro/src/lib.rs from 2018 edition to 2021
[INFO] [stderr]     Checking ch16-3-mutex v0.1.0 (/opt/rustwide/workdir/ch16-3-mutex)
[INFO] [stderr]    Migrating blog/src/lib.rs from 2018 edition to 2021
[INFO] [stderr]     Checking ch19-3 v0.1.0 (/opt/rustwide/workdir/ch19-3)
[INFO] [stderr]     Checking ch17-3 v0.1.0 (/opt/rustwide/workdir/ch17-3)
[INFO] [stderr]    Migrating ch17-2/src/main.rs from 2018 edition to 2021
[INFO] [stderr]     Checking ch15-5 v0.1.0 (/opt/rustwide/workdir/ch15-5)
[INFO] [stderr]    Migrating ch16-3-mutex/src/main.rs from 2018 edition to 2021
[INFO] [stderr]     Checking ch15-6 v0.1.0 (/opt/rustwide/workdir/ch15-6)
[INFO] [stderr]    Migrating ch19-3/src/main.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating ch17-3/src/lib.rs from 2018 edition to 2021
[INFO] [stderr]     Checking ch19-4 v0.1.0 (/opt/rustwide/workdir/ch19-4)
[INFO] [stderr]    Migrating ch15-5/src/main.rs from 2018 edition to 2021
[INFO] [stderr]     Checking ch16-2-messages v0.1.0 (/opt/rustwide/workdir/ch16-2-messages)
[INFO] [stderr]     Checking ch18-2 v0.1.0 (/opt/rustwide/workdir/ch18-2)
[INFO] [stderr]    Migrating ch15-6/src/main.rs from 2018 edition to 2021
[INFO] [stderr]     Checking ch15-4 v0.1.0 (/opt/rustwide/workdir/ch15-4)
[INFO] [stderr]     Checking custom-smart-ptr v0.1.0 (/opt/rustwide/workdir/custom-smart-ptr)
[INFO] [stderr]    Migrating ch19-4/src/main.rs from 2018 edition to 2021
[INFO] [stderr]     Checking ch19-2 v0.1.0 (/opt/rustwide/workdir/ch19-2)
[INFO] [stderr]    Migrating ch16-2-messages/src/main.rs from 2018 edition to 2021
[INFO] [stderr]     Checking smart-ptrs v0.1.0 (/opt/rustwide/workdir/smart-ptrs)
[INFO] [stderr]    Migrating ch18-2/src/main.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating ch15-4/src/main.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating custom-smart-ptr/src/main.rs from 2018 edition to 2021
[INFO] [stderr]     Checking ch16-1-threads v0.1.0 (/opt/rustwide/workdir/ch16-1-threads)
[INFO] [stderr]     Checking quote v0.6.12
[INFO] [stderr]    Migrating ch19-2/src/main.rs from 2018 edition to 2021
[INFO] [stderr]     Checking syn v0.14.9
[INFO] [stderr]    Migrating smart-ptrs/src/main.rs from 2018 edition to 2021
[INFO] [stderr]     Checking ch18-1 v0.1.0 (/opt/rustwide/workdir/ch18-1)
[INFO] [stderr]     Checking ch19-1 v0.1.0 (/opt/rustwide/workdir/ch19-1)
[INFO] [stderr]    Migrating ch16-1-threads/src/main.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating ch18-1/src/main.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating ch19-1/src/main.rs from 2018 edition to 2021
[INFO] [stderr]     Checking ch18-3 v0.1.0 (/opt/rustwide/workdir/ch18-3)
[INFO] [stderr]    Migrating ch18-3/src/main.rs from 2018 edition to 2021
[INFO] [stderr]        Fixed ch18-3/src/main.rs (5 fixes)
[INFO] [stderr]     Checking hello_macro_derive v0.1.0 (/opt/rustwide/workdir/hello_macro_derive)
[INFO] [stderr]    Migrating hello_macro_derive/src/lib.rs from 2018 edition to 2021
[INFO] [stderr]     Checking ch19-6 v0.1.0 (/opt/rustwide/workdir/ch19-6)
[INFO] [stderr]    Migrating ch19-6/src/main.rs from 2018 edition to 2021
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 8.28s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: syn v0.14.9
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] [stderr] crater-edition-check: blog v0.1.0 (/opt/rustwide/workdir/blog) updating edition from 2018 to 2021
[INFO] [stderr] crater-edition-check: ch15-4 v0.1.0 (/opt/rustwide/workdir/ch15-4) updating edition from 2018 to 2021
[INFO] [stderr] crater-edition-check: ch15-5 v0.1.0 (/opt/rustwide/workdir/ch15-5) updating edition from 2018 to 2021
[INFO] [stderr] crater-edition-check: ch15-6 v0.1.0 (/opt/rustwide/workdir/ch15-6) updating edition from 2018 to 2021
[INFO] [stderr] crater-edition-check: ch16-1-threads v0.1.0 (/opt/rustwide/workdir/ch16-1-threads) updating edition from 2018 to 2021
[INFO] [stderr] crater-edition-check: ch16-2-messages v0.1.0 (/opt/rustwide/workdir/ch16-2-messages) updating edition from 2018 to 2021
[INFO] [stderr] crater-edition-check: ch16-3-mutex v0.1.0 (/opt/rustwide/workdir/ch16-3-mutex) updating edition from 2018 to 2021
[INFO] [stderr] crater-edition-check: ch17-2 v0.1.0 (/opt/rustwide/workdir/ch17-2) updating edition from 2018 to 2021
[INFO] [stderr] crater-edition-check: ch17-3 v0.1.0 (/opt/rustwide/workdir/ch17-3) updating edition from 2018 to 2021
[INFO] [stderr] crater-edition-check: ch18-1 v0.1.0 (/opt/rustwide/workdir/ch18-1) updating edition from 2018 to 2021
[INFO] [stderr] crater-edition-check: ch18-2 v0.1.0 (/opt/rustwide/workdir/ch18-2) updating edition from 2018 to 2021
[INFO] [stderr] crater-edition-check: ch18-3 v0.1.0 (/opt/rustwide/workdir/ch18-3) updating edition from 2018 to 2021
[INFO] [stderr] crater-edition-check: ch19-1 v0.1.0 (/opt/rustwide/workdir/ch19-1) updating edition from 2018 to 2021
[INFO] [stderr] crater-edition-check: ch19-2 v0.1.0 (/opt/rustwide/workdir/ch19-2) updating edition from 2018 to 2021
[INFO] [stderr] crater-edition-check: ch19-3 v0.1.0 (/opt/rustwide/workdir/ch19-3) updating edition from 2018 to 2021
[INFO] [stderr] crater-edition-check: ch19-4 v0.1.0 (/opt/rustwide/workdir/ch19-4) updating edition from 2018 to 2021
[INFO] [stderr] crater-edition-check: ch19-6 v0.1.0 (/opt/rustwide/workdir/ch19-6) updating edition from 2018 to 2021
[INFO] [stderr] crater-edition-check: hello_macro v0.1.0 (/opt/rustwide/workdir/hello_macro) updating edition from 2018 to 2021
[INFO] [stderr] crater-edition-check: hello_macro_derive v0.1.0 (/opt/rustwide/workdir/hello_macro_derive) updating edition from 2018 to 2021
[INFO] [stderr] crater-edition-check: custom-smart-ptr v0.1.0 (/opt/rustwide/workdir/custom-smart-ptr) updating edition from 2018 to 2021
[INFO] [stderr] crater-edition-check: smart-ptrs v0.1.0 (/opt/rustwide/workdir/smart-ptrs) updating edition from 2018 to 2021
[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]     Checking hello_macro v0.1.0 (/opt/rustwide/workdir/hello_macro)
[INFO] [stderr]     Checking blog v0.1.0 (/opt/rustwide/workdir/blog)
[INFO] [stderr]     Checking ch16-2-messages v0.1.0 (/opt/rustwide/workdir/ch16-2-messages)
[INFO] [stderr]     Checking ch15-4 v0.1.0 (/opt/rustwide/workdir/ch15-4)
[INFO] [stderr]     Checking ch18-1 v0.1.0 (/opt/rustwide/workdir/ch18-1)
[INFO] [stderr]     Checking ch19-3 v0.1.0 (/opt/rustwide/workdir/ch19-3)
[INFO] [stderr]     Checking ch17-3 v0.1.0 (/opt/rustwide/workdir/ch17-3)
[INFO] [stderr]     Checking hello_macro_derive v0.1.0 (/opt/rustwide/workdir/hello_macro_derive)
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]  --> ch15-4/src/main.rs:6:10
[INFO] [stdout]   |
[INFO] [stdout] 6 |     Cons(i32, Rc<List>),
[INFO] [stdout]   |     ---- ^^^  ^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]   |
[INFO] [stdout] 6 -     Cons(i32, Rc<List>),
[INFO] [stdout] 6 +     Cons((), ()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]  --> ch15-4/src/main.rs:6:10
[INFO] [stdout]   |
[INFO] [stdout] 6 |     Cons(i32, Rc<List>),
[INFO] [stdout]   |     ---- ^^^  ^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]   |
[INFO] [stdout] 6 -     Cons(i32, Rc<List>),
[INFO] [stdout] 6 +     Cons((), ()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking ch19-1 v0.1.0 (/opt/rustwide/workdir/ch19-1)
[INFO] [stderr]     Checking ch19-2 v0.1.0 (/opt/rustwide/workdir/ch19-2)
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> ch19-2/src/main.rs:108:31
[INFO] [stdout]     |
[INFO] [stdout] 108 |     fn parse_context(context: Context) -> Result<(), &str> {
[INFO] [stdout]     |                               ^^^^^^^                ^^^^ the same lifetime is elided here
[INFO] [stdout]     |                               |
[INFO] [stdout]     |                               the lifetime is hidden 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] 108 |     fn parse_context(context: Context<'_>) -> Result<(), &str> {
[INFO] [stdout]     |                                      ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking ch18-3 v0.1.0 (/opt/rustwide/workdir/ch18-3)
[INFO] [stderr]     Checking smart-ptrs v0.1.0 (/opt/rustwide/workdir/smart-ptrs)
[INFO] [stdout] warning: creating a shared reference to mutable static
[INFO] [stdout]    --> ch19-1/src/main.rs:469:33
[INFO] [stdout]     |
[INFO] [stdout] 469 |         println!("COUNTER: {}", COUNTER);
[INFO] [stdout]     |                                 ^^^^^^^ shared reference to mutable static
[INFO] [stdout]     |
[INFO] [stdout]     = note: shared references to mutable statics are dangerous; it's undefined behavior if the static is mutated or if a mutable reference is created for it while the shared reference lives
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2024/static-mut-references.html>
[INFO] [stdout]     = note: `#[warn(static_mut_refs)]` (part of `#[warn(rust_2024_compatibility)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking ch15-6 v0.1.0 (/opt/rustwide/workdir/ch15-6)
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> smart-ptrs/src/main.rs:23:10
[INFO] [stdout]    |
[INFO] [stdout] 23 |     Cons(i32, Box<List>),
[INFO] [stdout]    |     ---- ^^^  ^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 23 -     Cons(i32, Box<List>),
[INFO] [stdout] 23 +     Cons((), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> smart-ptrs/src/main.rs:23:10
[INFO] [stdout]    |
[INFO] [stdout] 23 |     Cons(i32, Box<List>),
[INFO] [stdout]    |     ---- ^^^  ^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 23 -     Cons(i32, Box<List>),
[INFO] [stdout] 23 +     Cons((), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking custom-smart-ptr v0.1.0 (/opt/rustwide/workdir/custom-smart-ptr)
[INFO] [stderr]     Checking ch19-4 v0.1.0 (/opt/rustwide/workdir/ch19-4)
[INFO] [stderr]     Checking ch15-5 v0.1.0 (/opt/rustwide/workdir/ch15-5)
[INFO] [stdout] warning: creating a shared reference to mutable static
[INFO] [stdout]    --> ch19-1/src/main.rs:469:33
[INFO] [stdout]     |
[INFO] [stdout] 469 |         println!("COUNTER: {}", COUNTER);
[INFO] [stdout]     |                                 ^^^^^^^ shared reference to mutable static
[INFO] [stdout]     |
[INFO] [stdout]     = note: shared references to mutable statics are dangerous; it's undefined behavior if the static is mutated or if a mutable reference is created for it while the shared reference lives
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2024/static-mut-references.html>
[INFO] [stdout]     = note: `#[warn(static_mut_refs)]` (part of `#[warn(rust_2024_compatibility)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking ch16-3-mutex v0.1.0 (/opt/rustwide/workdir/ch16-3-mutex)
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> ch15-6/src/main.rs:8:10
[INFO] [stdout]   |
[INFO] [stdout] 8 |     Cons(i32, RefCell<Rc<List>>),
[INFO] [stdout]   |     ---- ^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `List` 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] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]   |
[INFO] [stdout] 8 -     Cons(i32, RefCell<Rc<List>>),
[INFO] [stdout] 8 +     Cons((), RefCell<Rc<List>>),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `value` and `children` are never read
[INFO] [stdout]   --> ch15-6/src/main.rs:40:5
[INFO] [stdout]    |
[INFO] [stdout] 39 | struct Node {
[INFO] [stdout]    |        ---- fields in this struct
[INFO] [stdout] 40 |     value: i32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 41 |     parent: RefCell<Weak<Node>>,
[INFO] [stdout] 42 |     children: RefCell<Vec<Rc<Node>>>,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking ch17-2 v0.1.0 (/opt/rustwide/workdir/ch17-2)
[INFO] [stderr]     Checking ch19-6 v0.1.0 (/opt/rustwide/workdir/ch19-6)
[INFO] [stderr]     Checking ch18-2 v0.1.0 (/opt/rustwide/workdir/ch18-2)
[INFO] [stdout] warning: fields `width`, `height`, and `options` are never read
[INFO] [stdout]   --> ch17-2/src/main.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 32 | struct SelectBox {
[INFO] [stdout]    |        --------- fields in this struct
[INFO] [stdout] 33 |     width: u32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 34 |     height: u32,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 35 |     options: Vec<String>,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SelectBox` 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: fields `0` and `1` are never read
[INFO] [stdout]  --> ch15-5/src/main.rs:8:10
[INFO] [stdout]   |
[INFO] [stdout] 8 |     Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stdout]   |     ---- ^^^^^^^^^^^^^^^^  ^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `List` 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] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]   |
[INFO] [stdout] 8 -     Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stdout] 8 +     Cons((), ()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> ch15-5/src/main.rs:73:20
[INFO] [stdout]    |
[INFO] [stdout] 73 |         messenger: &T,
[INFO] [stdout]    |                    ^^ the lifetime is elided here
[INFO] [stdout] 74 |         max: usize,
[INFO] [stdout] 75 |     ) -> LimitTracker<T> {
[INFO] [stdout]    |          ^^^^^^^^^^^^^^^ the same lifetime is hidden 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] 75 |     ) -> LimitTracker<'_, T> {
[INFO] [stdout]    |                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: irrefutable `if let` pattern
[INFO] [stdout]    --> ch18-2/src/main.rs:140:8
[INFO] [stdout]     |
[INFO] [stdout] 140 |     if let x = my_vec {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this pattern will always match, so the `if let` is useless
[INFO] [stdout]     = help: consider replacing the `if let` with a `let`
[INFO] [stdout]     = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> ch15-6/src/main.rs:8:10
[INFO] [stdout]   |
[INFO] [stdout] 8 |     Cons(i32, RefCell<Rc<List>>),
[INFO] [stdout]   |     ---- ^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `List` 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] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]   |
[INFO] [stdout] 8 -     Cons(i32, RefCell<Rc<List>>),
[INFO] [stdout] 8 +     Cons((), RefCell<Rc<List>>),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `value` and `children` are never read
[INFO] [stdout]   --> ch15-6/src/main.rs:40:5
[INFO] [stdout]    |
[INFO] [stdout] 39 | struct Node {
[INFO] [stdout]    |        ---- fields in this struct
[INFO] [stdout] 40 |     value: i32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 41 |     parent: RefCell<Weak<Node>>,
[INFO] [stdout] 42 |     children: RefCell<Vec<Rc<Node>>>,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> ch19-2/src/main.rs:108:31
[INFO] [stdout]     |
[INFO] [stdout] 108 |     fn parse_context(context: Context) -> Result<(), &str> {
[INFO] [stdout]     |                               ^^^^^^^                ^^^^ the same lifetime is elided here
[INFO] [stdout]     |                               |
[INFO] [stdout]     |                               the lifetime is hidden 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] 108 |     fn parse_context(context: Context<'_>) -> Result<(), &str> {
[INFO] [stdout]     |                                      ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking ch16-1-threads v0.1.0 (/opt/rustwide/workdir/ch16-1-threads)
[INFO] [stdout] warning: irrefutable `if let` pattern
[INFO] [stdout]    --> ch18-2/src/main.rs:140:8
[INFO] [stdout]     |
[INFO] [stdout] 140 |     if let x = my_vec {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this pattern will always match, so the `if let` is useless
[INFO] [stdout]     = help: consider replacing the `if let` with a `let`
[INFO] [stdout]     = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]  --> ch15-5/src/main.rs:8:10
[INFO] [stdout]   |
[INFO] [stdout] 8 |     Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stdout]   |     ---- ^^^^^^^^^^^^^^^^  ^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `List` 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] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]   |
[INFO] [stdout] 8 -     Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stdout] 8 +     Cons((), ()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> ch15-5/src/main.rs:73:20
[INFO] [stdout]    |
[INFO] [stdout] 73 |         messenger: &T,
[INFO] [stdout]    |                    ^^ the lifetime is elided here
[INFO] [stdout] 74 |         max: usize,
[INFO] [stdout] 75 |     ) -> LimitTracker<T> {
[INFO] [stdout]    |          ^^^^^^^^^^^^^^^ the same lifetime is hidden 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] 75 |     ) -> LimitTracker<'_, T> {
[INFO] [stdout]    |                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `width`, `height`, and `options` are never read
[INFO] [stdout]   --> ch17-2/src/main.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 32 | struct SelectBox {
[INFO] [stdout]    |        --------- fields in this struct
[INFO] [stdout] 33 |     width: u32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 34 |     height: u32,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 35 |     options: Vec<String>,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SelectBox` 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] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 10.11s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: syn v0.14.9
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] [stderr] crater-edition-check: migrating to next edition
[INFO] [stderr]    Migrating blog/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch15-4/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch15-5/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch15-6/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch16-1-threads/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch16-2-messages/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch16-3-mutex/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch17-2/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch17-3/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch18-1/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch18-2/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch18-3/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch19-1/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch19-2/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch19-3/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch19-4/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating ch19-6/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating hello_macro/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating hello_macro_derive/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating custom-smart-ptr/Cargo.toml from 2018 edition to 2021
[INFO] [stderr]    Migrating smart-ptrs/Cargo.toml from 2018 edition to 2021
[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]     Checking blog v0.1.0 (/opt/rustwide/workdir/blog)
[INFO] [stderr]     Checking ch18-1 v0.1.0 (/opt/rustwide/workdir/ch18-1)
[INFO] [stderr]     Checking ch19-1 v0.1.0 (/opt/rustwide/workdir/ch19-1)
[INFO] [stderr]     Checking ch18-2 v0.1.0 (/opt/rustwide/workdir/ch18-2)
[INFO] [stderr]     Checking ch15-5 v0.1.0 (/opt/rustwide/workdir/ch15-5)
[INFO] [stderr]     Checking ch15-6 v0.1.0 (/opt/rustwide/workdir/ch15-6)
[INFO] [stderr]    Migrating ch18-2/src/main.rs from 2021 edition to 2024
[INFO] [stderr]     Checking hello_macro_derive v0.1.0 (/opt/rustwide/workdir/hello_macro_derive)
[INFO] [stderr]     Checking ch19-6 v0.1.0 (/opt/rustwide/workdir/ch19-6)
[INFO] [stderr]    Migrating ch15-5/src/main.rs from 2021 edition to 2024
[INFO] [stderr]    Migrating blog/src/lib.rs from 2021 edition to 2024
[INFO] [stderr]    Migrating hello_macro_derive/src/lib.rs from 2021 edition to 2024
[INFO] [stderr]     Checking ch17-3 v0.1.0 (/opt/rustwide/workdir/ch17-3)
[INFO] [stderr]        Fixed hello_macro_derive/src/lib.rs (2 fixes)
[INFO] [stderr]    Migrating ch18-1/src/main.rs from 2021 edition to 2024
[INFO] [stderr]    Migrating ch19-6/src/main.rs from 2021 edition to 2024
[INFO] [stderr]     Checking ch16-2-messages v0.1.0 (/opt/rustwide/workdir/ch16-2-messages)
[INFO] [stderr]    Migrating ch19-1/src/main.rs from 2021 edition to 2024
[INFO] [stderr]     Checking ch18-3 v0.1.0 (/opt/rustwide/workdir/ch18-3)
[INFO] [stdout] warning: creating a shared reference to mutable static
[INFO] [stdout]    --> ch19-1/src/main.rs:469:33
[INFO] [stdout]     |
[INFO] [stdout] 469 |         println!("COUNTER: {}", COUNTER);
[INFO] [stdout]     |                                 ^^^^^^^ shared reference to mutable static
[INFO] [stdout]     |
[INFO] [stdout]     = note: shared references to mutable statics are dangerous; it's undefined behavior if the static is mutated or if a mutable reference is created for it while the shared reference lives
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2024/static-mut-references.html>
[INFO] [stdout]     = note: `--force-warn static-mut-refs` implied by `--force-warn rust-2024-compatibility`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]        Fixed ch19-1/src/main.rs (1 fix)
[INFO] [stderr]    Migrating ch15-6/src/main.rs from 2021 edition to 2024
[INFO] [stderr]     Checking custom-smart-ptr v0.1.0 (/opt/rustwide/workdir/custom-smart-ptr)
[INFO] [stderr]     Checking ch16-3-mutex v0.1.0 (/opt/rustwide/workdir/ch16-3-mutex)
[INFO] [stderr]    Migrating ch17-3/src/lib.rs from 2021 edition to 2024
[INFO] [stderr]     Checking ch16-1-threads v0.1.0 (/opt/rustwide/workdir/ch16-1-threads)
[INFO] [stderr]    Migrating ch16-2-messages/src/main.rs from 2021 edition to 2024
[INFO] [stderr]     Checking ch19-3 v0.1.0 (/opt/rustwide/workdir/ch19-3)
[INFO] [stderr]    Migrating ch18-3/src/main.rs from 2021 edition to 2024
[INFO] [stderr]    Migrating custom-smart-ptr/src/main.rs from 2021 edition to 2024
[INFO] [stderr]     Checking ch19-4 v0.1.0 (/opt/rustwide/workdir/ch19-4)
[INFO] [stderr]    Migrating ch16-3-mutex/src/main.rs from 2021 edition to 2024
[INFO] [stderr]    Migrating ch16-1-threads/src/main.rs from 2021 edition to 2024
[INFO] [stderr]     Checking smart-ptrs v0.1.0 (/opt/rustwide/workdir/smart-ptrs)
[INFO] [stderr]    Migrating ch19-3/src/main.rs from 2021 edition to 2024
[INFO] [stderr]    Migrating ch19-4/src/main.rs from 2021 edition to 2024
[INFO] [stderr]     Checking ch17-2 v0.1.0 (/opt/rustwide/workdir/ch17-2)
[INFO] [stderr]    Migrating smart-ptrs/src/main.rs from 2021 edition to 2024
[INFO] [stderr]     Checking ch19-2 v0.1.0 (/opt/rustwide/workdir/ch19-2)
[INFO] [stderr]     Checking hello_macro v0.1.0 (/opt/rustwide/workdir/hello_macro)
[INFO] [stderr]    Migrating ch17-2/src/main.rs from 2021 edition to 2024
[INFO] [stderr]    Migrating ch19-2/src/main.rs from 2021 edition to 2024
[INFO] [stdout] warning: creating a shared reference to mutable static
[INFO] [stdout]    --> ch19-1/src/main.rs:469:33
[INFO] [stdout]     |
[INFO] [stdout] 469 |         println!("COUNTER: {}", COUNTER);
[INFO] [stdout]     |                                 ^^^^^^^ shared reference to mutable static
[INFO] [stdout]     |
[INFO] [stdout]     = note: shared references to mutable statics are dangerous; it's undefined behavior if the static is mutated or if a mutable reference is created for it while the shared reference lives
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2024/static-mut-references.html>
[INFO] [stdout]     = note: `--force-warn static-mut-refs` implied by `--force-warn rust-2024-compatibility`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking ch15-4 v0.1.0 (/opt/rustwide/workdir/ch15-4)
[INFO] [stderr]    Migrating hello_macro/src/lib.rs from 2021 edition to 2024
[INFO] [stderr]    Migrating ch15-4/src/main.rs from 2021 edition to 2024
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 14.89s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: syn v0.14.9
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] [stderr] crater-edition-check: blog v0.1.0 (/opt/rustwide/workdir/blog) updating edition from 2021 to 2024
[INFO] [stderr] crater-edition-check: ch15-4 v0.1.0 (/opt/rustwide/workdir/ch15-4) updating edition from 2021 to 2024
[INFO] [stderr] crater-edition-check: ch15-5 v0.1.0 (/opt/rustwide/workdir/ch15-5) updating edition from 2021 to 2024
[INFO] [stderr] crater-edition-check: ch15-6 v0.1.0 (/opt/rustwide/workdir/ch15-6) updating edition from 2021 to 2024
[INFO] [stderr] crater-edition-check: ch16-1-threads v0.1.0 (/opt/rustwide/workdir/ch16-1-threads) updating edition from 2021 to 2024
[INFO] [stderr] crater-edition-check: ch16-2-messages v0.1.0 (/opt/rustwide/workdir/ch16-2-messages) updating edition from 2021 to 2024
[INFO] [stderr] crater-edition-check: ch16-3-mutex v0.1.0 (/opt/rustwide/workdir/ch16-3-mutex) updating edition from 2021 to 2024
[INFO] [stderr] crater-edition-check: ch17-2 v0.1.0 (/opt/rustwide/workdir/ch17-2) updating edition from 2021 to 2024
[INFO] [stderr] crater-edition-check: ch17-3 v0.1.0 (/opt/rustwide/workdir/ch17-3) updating edition from 2021 to 2024
[INFO] [stderr] crater-edition-check: ch18-1 v0.1.0 (/opt/rustwide/workdir/ch18-1) updating edition from 2021 to 2024
[INFO] [stderr] crater-edition-check: ch18-2 v0.1.0 (/opt/rustwide/workdir/ch18-2) updating edition from 2021 to 2024
[INFO] [stderr] crater-edition-check: ch18-3 v0.1.0 (/opt/rustwide/workdir/ch18-3) updating edition from 2021 to 2024
[INFO] [stderr] crater-edition-check: ch19-1 v0.1.0 (/opt/rustwide/workdir/ch19-1) updating edition from 2021 to 2024
[INFO] [stderr] crater-edition-check: ch19-2 v0.1.0 (/opt/rustwide/workdir/ch19-2) updating edition from 2021 to 2024
[INFO] [stderr] crater-edition-check: ch19-3 v0.1.0 (/opt/rustwide/workdir/ch19-3) updating edition from 2021 to 2024
[INFO] [stderr] crater-edition-check: ch19-4 v0.1.0 (/opt/rustwide/workdir/ch19-4) updating edition from 2021 to 2024
[INFO] [stderr] crater-edition-check: ch19-6 v0.1.0 (/opt/rustwide/workdir/ch19-6) updating edition from 2021 to 2024
[INFO] [stderr] crater-edition-check: hello_macro v0.1.0 (/opt/rustwide/workdir/hello_macro) updating edition from 2021 to 2024
[INFO] [stderr] crater-edition-check: hello_macro_derive v0.1.0 (/opt/rustwide/workdir/hello_macro_derive) updating edition from 2021 to 2024
[INFO] [stderr] crater-edition-check: custom-smart-ptr v0.1.0 (/opt/rustwide/workdir/custom-smart-ptr) updating edition from 2021 to 2024
[INFO] [stderr] crater-edition-check: smart-ptrs v0.1.0 (/opt/rustwide/workdir/smart-ptrs) updating edition from 2021 to 2024
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2024 which implies `resolver = "3"`
[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 2024 resolver, specify `workspace.resolver = "3"` 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]     Checking hello_macro v0.1.0 (/opt/rustwide/workdir/hello_macro)
[INFO] [stderr]     Checking blog v0.1.0 (/opt/rustwide/workdir/blog)
[INFO] [stderr]     Checking ch16-1-threads v0.1.0 (/opt/rustwide/workdir/ch16-1-threads)
[INFO] [stderr]     Checking ch19-4 v0.1.0 (/opt/rustwide/workdir/ch19-4)
[INFO] [stderr]     Checking ch15-4 v0.1.0 (/opt/rustwide/workdir/ch15-4)
[INFO] [stderr]     Checking smart-ptrs v0.1.0 (/opt/rustwide/workdir/smart-ptrs)
[INFO] [stderr]     Checking ch16-3-mutex v0.1.0 (/opt/rustwide/workdir/ch16-3-mutex)
[INFO] [stderr]     Checking ch18-2 v0.1.0 (/opt/rustwide/workdir/ch18-2)
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]  --> ch15-4/src/main.rs:6:10
[INFO] [stdout]   |
[INFO] [stdout] 6 |     Cons(i32, Rc<List>),
[INFO] [stdout]   |     ---- ^^^  ^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]   |
[INFO] [stdout] 6 -     Cons(i32, Rc<List>),
[INFO] [stdout] 6 +     Cons((), ()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking hello_macro_derive v0.1.0 (/opt/rustwide/workdir/hello_macro_derive)
[INFO] [stdout] warning: irrefutable `if let` pattern
[INFO] [stdout]    --> ch18-2/src/main.rs:140:8
[INFO] [stdout]     |
[INFO] [stdout] 140 |     if let x = my_vec {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this pattern will always match, so the `if let` is useless
[INFO] [stdout]     = help: consider replacing the `if let` with a `let`
[INFO] [stdout]     = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking ch17-3 v0.1.0 (/opt/rustwide/workdir/ch17-3)
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> smart-ptrs/src/main.rs:23:10
[INFO] [stdout]    |
[INFO] [stdout] 23 |     Cons(i32, Box<List>),
[INFO] [stdout]    |     ---- ^^^  ^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 23 -     Cons(i32, Box<List>),
[INFO] [stdout] 23 +     Cons((), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking ch17-2 v0.1.0 (/opt/rustwide/workdir/ch17-2)
[INFO] [stderr]     Checking ch15-6 v0.1.0 (/opt/rustwide/workdir/ch15-6)
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]  --> ch15-4/src/main.rs:6:10
[INFO] [stdout]   |
[INFO] [stdout] 6 |     Cons(i32, Rc<List>),
[INFO] [stdout]   |     ---- ^^^  ^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]   |
[INFO] [stdout] 6 -     Cons(i32, Rc<List>),
[INFO] [stdout] 6 +     Cons((), ()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking ch18-3 v0.1.0 (/opt/rustwide/workdir/ch18-3)
[INFO] [stderr]     Checking custom-smart-ptr v0.1.0 (/opt/rustwide/workdir/custom-smart-ptr)
[INFO] [stderr]     Checking ch19-3 v0.1.0 (/opt/rustwide/workdir/ch19-3)
[INFO] [stdout] warning: fields `width`, `height`, and `options` are never read
[INFO] [stdout]   --> ch17-2/src/main.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 32 | struct SelectBox {
[INFO] [stdout]    |        --------- fields in this struct
[INFO] [stdout] 33 |     width: u32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 34 |     height: u32,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 35 |     options: Vec<String>,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SelectBox` 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 `0` is never read
[INFO] [stdout]  --> ch15-6/src/main.rs:8:10
[INFO] [stdout]   |
[INFO] [stdout] 8 |     Cons(i32, RefCell<Rc<List>>),
[INFO] [stdout]   |     ---- ^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `List` 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] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]   |
[INFO] [stdout] 8 -     Cons(i32, RefCell<Rc<List>>),
[INFO] [stdout] 8 +     Cons((), RefCell<Rc<List>>),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `value` and `children` are never read
[INFO] [stdout]   --> ch15-6/src/main.rs:40:5
[INFO] [stdout]    |
[INFO] [stdout] 39 | struct Node {
[INFO] [stdout]    |        ---- fields in this struct
[INFO] [stdout] 40 |     value: i32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 41 |     parent: RefCell<Weak<Node>>,
[INFO] [stdout] 42 |     children: RefCell<Vec<Rc<Node>>>,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking ch16-2-messages v0.1.0 (/opt/rustwide/workdir/ch16-2-messages)
[INFO] [stderr]     Checking ch18-1 v0.1.0 (/opt/rustwide/workdir/ch18-1)
[INFO] [stderr]     Checking ch19-2 v0.1.0 (/opt/rustwide/workdir/ch19-2)
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> ch19-2/src/main.rs:108:31
[INFO] [stdout]     |
[INFO] [stdout] 108 |     fn parse_context(context: Context) -> Result<(), &str> {
[INFO] [stdout]     |                               ^^^^^^^                ^^^^ the same lifetime is elided here
[INFO] [stdout]     |                               |
[INFO] [stdout]     |                               the lifetime is hidden 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] 108 |     fn parse_context(context: Context<'_>) -> Result<(), &str> {
[INFO] [stdout]     |                                      ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: irrefutable `if let` pattern
[INFO] [stdout]    --> ch18-2/src/main.rs:140:8
[INFO] [stdout]     |
[INFO] [stdout] 140 |     if let x = my_vec {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this pattern will always match, so the `if let` is useless
[INFO] [stdout]     = help: consider replacing the `if let` with a `let`
[INFO] [stdout]     = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking ch15-5 v0.1.0 (/opt/rustwide/workdir/ch15-5)
[INFO] [stderr]     Checking ch19-1 v0.1.0 (/opt/rustwide/workdir/ch19-1)
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> smart-ptrs/src/main.rs:23:10
[INFO] [stdout]    |
[INFO] [stdout] 23 |     Cons(i32, Box<List>),
[INFO] [stdout]    |     ---- ^^^  ^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 23 -     Cons(i32, Box<List>),
[INFO] [stdout] 23 +     Cons((), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `width`, `height`, and `options` are never read
[INFO] [stdout]   --> ch17-2/src/main.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 32 | struct SelectBox {
[INFO] [stdout]    |        --------- fields in this struct
[INFO] [stdout] 33 |     width: u32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 34 |     height: u32,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 35 |     options: Vec<String>,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SelectBox` 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 `0` is never read
[INFO] [stdout]  --> ch15-6/src/main.rs:8:10
[INFO] [stdout]   |
[INFO] [stdout] 8 |     Cons(i32, RefCell<Rc<List>>),
[INFO] [stdout]   |     ---- ^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `List` 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] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]   |
[INFO] [stdout] 8 -     Cons(i32, RefCell<Rc<List>>),
[INFO] [stdout] 8 +     Cons((), RefCell<Rc<List>>),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `value` and `children` are never read
[INFO] [stdout]   --> ch15-6/src/main.rs:40:5
[INFO] [stdout]    |
[INFO] [stdout] 39 | struct Node {
[INFO] [stdout]    |        ---- fields in this struct
[INFO] [stdout] 40 |     value: i32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 41 |     parent: RefCell<Weak<Node>>,
[INFO] [stdout] 42 |     children: RefCell<Vec<Rc<Node>>>,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Node` 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 `0` and `1` are never read
[INFO] [stdout]  --> ch15-5/src/main.rs:8:10
[INFO] [stdout]   |
[INFO] [stdout] 8 |     Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stdout]   |     ---- ^^^^^^^^^^^^^^^^  ^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `List` 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] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]   |
[INFO] [stdout] 8 -     Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stdout] 8 +     Cons((), ()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> ch15-5/src/main.rs:73:20
[INFO] [stdout]    |
[INFO] [stdout] 73 |         messenger: &T,
[INFO] [stdout]    |                    ^^ the lifetime is elided here
[INFO] [stdout] 74 |         max: usize,
[INFO] [stdout] 75 |     ) -> LimitTracker<T> {
[INFO] [stdout]    |          ^^^^^^^^^^^^^^^ the same lifetime is hidden 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] 75 |     ) -> LimitTracker<'_, T> {
[INFO] [stdout]    |                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> ch19-2/src/main.rs:108:31
[INFO] [stdout]     |
[INFO] [stdout] 108 |     fn parse_context(context: Context) -> Result<(), &str> {
[INFO] [stdout]     |                               ^^^^^^^                ^^^^ the same lifetime is elided here
[INFO] [stdout]     |                               |
[INFO] [stdout]     |                               the lifetime is hidden 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] 108 |     fn parse_context(context: Context<'_>) -> Result<(), &str> {
[INFO] [stdout]     |                                      ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking ch19-6 v0.1.0 (/opt/rustwide/workdir/ch19-6)
[INFO] [stdout] error: creating a shared reference to mutable static
[INFO] [stdout]    --> ch19-1/src/main.rs:469:33
[INFO] [stdout]     |
[INFO] [stdout] 469 |         println!("COUNTER: {}", COUNTER);
[INFO] [stdout]     |                                 ^^^^^^^ shared reference to mutable static
[INFO] [stdout]     |
[INFO] [stdout]     = note: shared references to mutable statics are dangerous; it's undefined behavior if the static is mutated or if a mutable reference is created for it while the shared reference lives
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2024/static-mut-references.html>
[INFO] [stdout]     = note: `#[deny(static_mut_refs)]` (part of `#[deny(rust_2024_compatibility)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: creating a shared reference to mutable static
[INFO] [stdout]    --> ch19-1/src/main.rs:469:33
[INFO] [stdout]     |
[INFO] [stdout] 469 |         println!("COUNTER: {}", COUNTER);
[INFO] [stdout]     |                                 ^^^^^^^ shared reference to mutable static
[INFO] [stdout]     |
[INFO] [stdout]     = note: shared references to mutable statics are dangerous; it's undefined behavior if the static is mutated or if a mutable reference is created for it while the shared reference lives
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2024/static-mut-references.html>
[INFO] [stdout]     = note: `#[deny(static_mut_refs)]` (part of `#[deny(rust_2024_compatibility)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ch19-1` (bin "ch19-1") due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `ch19-1` (bin "ch19-1" test) due to 1 previous error
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]  --> ch15-5/src/main.rs:8:10
[INFO] [stdout]   |
[INFO] [stdout] 8 |     Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stdout]   |     ---- ^^^^^^^^^^^^^^^^  ^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `List` 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] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]   |
[INFO] [stdout] 8 -     Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stdout] 8 +     Cons((), ()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> ch15-5/src/main.rs:73:20
[INFO] [stdout]    |
[INFO] [stdout] 73 |         messenger: &T,
[INFO] [stdout]    |                    ^^ the lifetime is elided here
[INFO] [stdout] 74 |         max: usize,
[INFO] [stdout] 75 |     ) -> LimitTracker<T> {
[INFO] [stdout]    |          ^^^^^^^^^^^^^^^ the same lifetime is hidden 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] 75 |     ) -> LimitTracker<'_, T> {
[INFO] [stdout]    |                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "416c15b29733811f4f028d6902f0a5aca27d5c8626030a4a867cdfb9b06a8574", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "416c15b29733811f4f028d6902f0a5aca27d5c8626030a4a867cdfb9b06a8574", kill_on_drop: false }`
[INFO] [stdout] 416c15b29733811f4f028d6902f0a5aca27d5c8626030a4a867cdfb9b06a8574
