[INFO] fetching crate vstd 0.0.0-2026-05-24-0157...
[INFO] checking vstd-0.0.0-2026-05-24-0157 against try#93086cfebfccb79083c59d0d3b2052944bba643c for pr-146440-1
[INFO] extracting crate vstd 0.0.0-2026-05-24-0157 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate vstd 0.0.0-2026-05-24-0157
[INFO] finished tweaking crates.io crate vstd 0.0.0-2026-05-24-0157
[INFO] tweaked toml for crates.io crate vstd 0.0.0-2026-05-24-0157 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate vstd 0.0.0-2026-05-24-0157 on toolchain 93086cfebfccb79083c59d0d3b2052944bba643c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+93086cfebfccb79083c59d0d3b2052944bba643c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate vstd 0.0.0-2026-05-24-0157 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" "+93086cfebfccb79083c59d0d3b2052944bba643c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+93086cfebfccb79083c59d0d3b2052944bba643c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1ca082cd6b52a3c5bacd063fbb856b09dc4640d4a2f50af40bcd6c863eff68d0
[INFO] running `Command { std: "docker" "start" "-a" "1ca082cd6b52a3c5bacd063fbb856b09dc4640d4a2f50af40bcd6c863eff68d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1ca082cd6b52a3c5bacd063fbb856b09dc4640d4a2f50af40bcd6c863eff68d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1ca082cd6b52a3c5bacd063fbb856b09dc4640d4a2f50af40bcd6c863eff68d0", kill_on_drop: false }`
[INFO] [stdout] 1ca082cd6b52a3c5bacd063fbb856b09dc4640d4a2f50af40bcd6c863eff68d0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-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" "+93086cfebfccb79083c59d0d3b2052944bba643c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 62e4aaa2f929ead20d32dc18ad73c6e8e9a5eafe5a3363098878a717778ae3de
[INFO] running `Command { std: "docker" "start" "-a" "62e4aaa2f929ead20d32dc18ad73c6e8e9a5eafe5a3363098878a717778ae3de", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.106
[INFO] [stderr]    Compiling verus_prettyplease v0.0.0-2026-05-24-0157
[INFO] [stderr]    Compiling hashbrown v0.12.3
[INFO] [stderr]    Compiling vstd v0.0.0-2026-05-24-0157 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking verus_builtin v0.0.0-2026-05-17-0151
[INFO] [stderr]    Compiling indexmap v1.9.3
[INFO] [stderr]    Compiling quote v1.0.45
[INFO] [stderr]    Compiling verus_syn v0.0.0-2026-05-24-0157
[INFO] [stderr]    Compiling syn v2.0.117
[INFO] [stderr]    Compiling synstructure v0.13.2
[INFO] [stderr]    Compiling verus_state_machines_macros v0.0.0-2026-05-24-0157
[INFO] [stderr]    Compiling verus_builtin_macros v0.0.0-2026-05-24-0157
[INFO] [stdout] error: struct `ExString` is never constructed
[INFO] [stdout]    --> string.rs:325:12
[INFO] [stdout]     |
[INFO] [stdout] 325 | pub struct ExString(String);
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `pub` struct has private fields, no public constructor, and is not otherwise reachable through the external API, so consider providing a public constructor or removing it
[INFO] [stdout]     = note: `#[deny(unused_unconstructable_pub_structs)]` (part of `#[deny(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: struct `ExChars` is never constructed
[INFO] [stdout]    --> string.rs:428:12
[INFO] [stdout]     |
[INFO] [stdout] 428 | pub struct ExChars<'a>(Chars<'a>);
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `pub` struct has private fields, no public constructor, and is not otherwise reachable through the external API, so consider providing a public constructor or removing it
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: negative impls are experimental
[INFO] [stdout]    --> invariant.rs:170:18
[INFO] [stdout]     |
[INFO] [stdout] 170 | impl<K, V, Pred> !Sync for LocalInvariant<K, V, Pred> {}
[INFO] [stdout]     |                  ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #68318 <https://github.com/rust-lang/rust/issues/68318> for more information
[INFO] [stdout]     = help: add `#![feature(negative_impls)]` to the crate attributes to enable
[INFO] [stdout]     = note: this compiler was built on 2026-05-31; consider upgrading it if it is out of date
[INFO] [stdout]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]     = note: for more information, see issue #154045 <https://github.com/rust-lang/rust/issues/154045>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: negative impls are experimental
[INFO] [stdout]    --> thread.rs:153:6
[INFO] [stdout]     |
[INFO] [stdout] 153 | impl !Sync for IsThread {
[INFO] [stdout]     |      ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #68318 <https://github.com/rust-lang/rust/issues/68318> for more information
[INFO] [stdout]     = help: add `#![feature(negative_impls)]` to the crate attributes to enable
[INFO] [stdout]     = note: this compiler was built on 2026-05-31; consider upgrading it if it is out of date
[INFO] [stdout]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]     = note: for more information, see issue #154045 <https://github.com/rust-lang/rust/issues/154045>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: negative impls are experimental
[INFO] [stdout]    --> thread.rs:158:6
[INFO] [stdout]     |
[INFO] [stdout] 158 | impl !Send for IsThread {
[INFO] [stdout]     |      ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #68318 <https://github.com/rust-lang/rust/issues/68318> for more information
[INFO] [stdout]     = help: add `#![feature(negative_impls)]` to the crate attributes to enable
[INFO] [stdout]     = note: this compiler was built on 2026-05-31; consider upgrading it if it is out of date
[INFO] [stdout]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]     = note: for more information, see issue #154045 <https://github.com/rust-lang/rust/issues/154045>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `vstd` (lib test) due to 2 previous errors; 3 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: struct `ExString` is never constructed
[INFO] [stdout]    --> string.rs:325:12
[INFO] [stdout]     |
[INFO] [stdout] 325 | pub struct ExString(String);
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `pub` struct has private fields, no public constructor, and is not otherwise reachable through the external API, so consider providing a public constructor or removing it
[INFO] [stdout]     = note: `#[deny(unused_unconstructable_pub_structs)]` (part of `#[deny(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: struct `ExChars` is never constructed
[INFO] [stdout]    --> string.rs:428:12
[INFO] [stdout]     |
[INFO] [stdout] 428 | pub struct ExChars<'a>(Chars<'a>);
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `pub` struct has private fields, no public constructor, and is not otherwise reachable through the external API, so consider providing a public constructor or removing it
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: negative impls are experimental
[INFO] [stdout]    --> invariant.rs:170:18
[INFO] [stdout]     |
[INFO] [stdout] 170 | impl<K, V, Pred> !Sync for LocalInvariant<K, V, Pred> {}
[INFO] [stdout]     |                  ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #68318 <https://github.com/rust-lang/rust/issues/68318> for more information
[INFO] [stdout]     = help: add `#![feature(negative_impls)]` to the crate attributes to enable
[INFO] [stdout]     = note: this compiler was built on 2026-05-31; consider upgrading it if it is out of date
[INFO] [stdout]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]     = note: for more information, see issue #154045 <https://github.com/rust-lang/rust/issues/154045>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: negative impls are experimental
[INFO] [stdout]    --> thread.rs:153:6
[INFO] [stdout]     |
[INFO] [stdout] 153 | impl !Sync for IsThread {
[INFO] [stdout]     |      ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #68318 <https://github.com/rust-lang/rust/issues/68318> for more information
[INFO] [stdout]     = help: add `#![feature(negative_impls)]` to the crate attributes to enable
[INFO] [stdout]     = note: this compiler was built on 2026-05-31; consider upgrading it if it is out of date
[INFO] [stdout]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]     = note: for more information, see issue #154045 <https://github.com/rust-lang/rust/issues/154045>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: negative impls are experimental
[INFO] [stdout]    --> thread.rs:158:6
[INFO] [stdout]     |
[INFO] [stdout] 158 | impl !Send for IsThread {
[INFO] [stdout]     |      ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #68318 <https://github.com/rust-lang/rust/issues/68318> for more information
[INFO] [stdout]     = help: add `#![feature(negative_impls)]` to the crate attributes to enable
[INFO] [stdout]     = note: this compiler was built on 2026-05-31; consider upgrading it if it is out of date
[INFO] [stdout]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]     = note: for more information, see issue #154045 <https://github.com/rust-lang/rust/issues/154045>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `vstd` (lib) due to 2 previous errors; 3 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "62e4aaa2f929ead20d32dc18ad73c6e8e9a5eafe5a3363098878a717778ae3de", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "62e4aaa2f929ead20d32dc18ad73c6e8e9a5eafe5a3363098878a717778ae3de", kill_on_drop: false }`
[INFO] [stdout] 62e4aaa2f929ead20d32dc18ad73c6e8e9a5eafe5a3363098878a717778ae3de
