[INFO] cloning repository https://github.com/CaffeineDuck/jBREAD
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/CaffeineDuck/jBREAD" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCaffeineDuck%2FjBREAD", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCaffeineDuck%2FjBREAD'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 234c64a9a3d207f4e013fc7b109c2b982dc800fe
[INFO] checking CaffeineDuck/jBREAD against 1.95.0 for pr-155915
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCaffeineDuck%2FjBREAD" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/CaffeineDuck/jBREAD
[INFO] finished tweaking git repo https://github.com/CaffeineDuck/jBREAD
[INFO] tweaked toml for git repo https://github.com/CaffeineDuck/jBREAD written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/CaffeineDuck/jBREAD on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/CaffeineDuck/jBREAD 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" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 832a8b70c3ff6576f776190afd0b3c24a9de4d19e888f7a7875c6fd26d80362f
[INFO] running `Command { std: "docker" "start" "-a" "832a8b70c3ff6576f776190afd0b3c24a9de4d19e888f7a7875c6fd26d80362f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "832a8b70c3ff6576f776190afd0b3c24a9de4d19e888f7a7875c6fd26d80362f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "832a8b70c3ff6576f776190afd0b3c24a9de4d19e888f7a7875c6fd26d80362f", kill_on_drop: false }`
[INFO] [stdout] 832a8b70c3ff6576f776190afd0b3c24a9de4d19e888f7a7875c6fd26d80362f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3eaedcd4aad1268f79998d1237dbf63700fe4ee6fe4f0ab1287f4eaee8936392
[INFO] running `Command { std: "docker" "start" "-a" "3eaedcd4aad1268f79998d1237dbf63700fe4ee6fe4f0ab1287f4eaee8936392", kill_on_drop: false }`
[INFO] [stderr]     Checking j_bread v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(const_mut_refs)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `const_mut_refs` has been stable since `1.83.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `generate_ast::*`
[INFO] [stdout]  --> src/tool/mod.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub use generate_ast::*;
[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: `scanner::*`
[INFO] [stdout]   --> src/lib.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub use scanner::*;
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `const_mut_refs` has been stable since 1.83.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(const_mut_refs)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(const_mut_refs)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `const_mut_refs` has been stable since `1.83.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `generate_ast::*`
[INFO] [stdout]  --> src/tool/mod.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub use generate_ast::*;
[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: `scanner::*`
[INFO] [stdout]   --> src/lib.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub use scanner::*;
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `const_mut_refs` has been stable since 1.83.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(const_mut_refs)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `expr`
[INFO] [stdout]   --> src/tool/print_ast.rs:40:39
[INFO] [stdout]    |
[INFO] [stdout] 40 |     fn visit_expr_variable(&mut self, expr: &crate::ast::Variable) -> Self::Result {
[INFO] [stdout]    |                                       ^^^^ help: if this is intentional, prefix it with an underscore: `_expr`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `expr`
[INFO] [stdout]   --> src/tool/print_ast.rs:44:37
[INFO] [stdout]    |
[INFO] [stdout] 44 |     fn visit_expr_assign(&mut self, expr: &crate::ast::Assign) -> Self::Result {
[INFO] [stdout]    |                                     ^^^^ help: if this is intentional, prefix it with an underscore: `_expr`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `expr`
[INFO] [stdout]   --> src/tool/print_ast.rs:52:41
[INFO] [stdout]    |
[INFO] [stdout] 52 |     fn visit_stmt_expression(&mut self, expr: &crate::ast::Expression) -> Self::Result {
[INFO] [stdout]    |                                         ^^^^ help: if this is intentional, prefix it with an underscore: `_expr`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `expr`
[INFO] [stdout]   --> src/tool/print_ast.rs:56:36
[INFO] [stdout]    |
[INFO] [stdout] 56 |     fn visit_stmt_print(&mut self, expr: &crate::ast::Print) -> Self::Result {
[INFO] [stdout]    |                                    ^^^^ help: if this is intentional, prefix it with an underscore: `_expr`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `expr`
[INFO] [stdout]   --> src/tool/print_ast.rs:60:34
[INFO] [stdout]    |
[INFO] [stdout] 60 |     fn visit_stmt_var(&mut self, expr: &crate::ast::Var) -> Self::Result {
[INFO] [stdout]    |                                  ^^^^ help: if this is intentional, prefix it with an underscore: `_expr`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `expr`
[INFO] [stdout]   --> src/tool/print_ast.rs:64:36
[INFO] [stdout]    |
[INFO] [stdout] 64 |     fn visit_stmt_block(&mut self, expr: &crate::ast::Block) -> Self::Result {
[INFO] [stdout]    |                                    ^^^^ help: if this is intentional, prefix it with an underscore: `_expr`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `j_bread` (lib) due to 1 previous error; 9 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused variable: `expr`
[INFO] [stdout]   --> src/tool/print_ast.rs:40:39
[INFO] [stdout]    |
[INFO] [stdout] 40 |     fn visit_expr_variable(&mut self, expr: &crate::ast::Variable) -> Self::Result {
[INFO] [stdout]    |                                       ^^^^ help: if this is intentional, prefix it with an underscore: `_expr`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `expr`
[INFO] [stdout]   --> src/tool/print_ast.rs:44:37
[INFO] [stdout]    |
[INFO] [stdout] 44 |     fn visit_expr_assign(&mut self, expr: &crate::ast::Assign) -> Self::Result {
[INFO] [stdout]    |                                     ^^^^ help: if this is intentional, prefix it with an underscore: `_expr`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `expr`
[INFO] [stdout]   --> src/tool/print_ast.rs:52:41
[INFO] [stdout]    |
[INFO] [stdout] 52 |     fn visit_stmt_expression(&mut self, expr: &crate::ast::Expression) -> Self::Result {
[INFO] [stdout]    |                                         ^^^^ help: if this is intentional, prefix it with an underscore: `_expr`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `expr`
[INFO] [stdout]   --> src/tool/print_ast.rs:56:36
[INFO] [stdout]    |
[INFO] [stdout] 56 |     fn visit_stmt_print(&mut self, expr: &crate::ast::Print) -> Self::Result {
[INFO] [stdout]    |                                    ^^^^ help: if this is intentional, prefix it with an underscore: `_expr`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `expr`
[INFO] [stdout]   --> src/tool/print_ast.rs:60:34
[INFO] [stdout]    |
[INFO] [stdout] 60 |     fn visit_stmt_var(&mut self, expr: &crate::ast::Var) -> Self::Result {
[INFO] [stdout]    |                                  ^^^^ help: if this is intentional, prefix it with an underscore: `_expr`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `expr`
[INFO] [stdout]   --> src/tool/print_ast.rs:64:36
[INFO] [stdout]    |
[INFO] [stdout] 64 |     fn visit_stmt_block(&mut self, expr: &crate::ast::Block) -> Self::Result {
[INFO] [stdout]    |                                    ^^^^ help: if this is intentional, prefix it with an underscore: `_expr`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `j_bread` (lib test) due to 1 previous error; 9 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "3eaedcd4aad1268f79998d1237dbf63700fe4ee6fe4f0ab1287f4eaee8936392", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3eaedcd4aad1268f79998d1237dbf63700fe4ee6fe4f0ab1287f4eaee8936392", kill_on_drop: false }`
[INFO] [stdout] 3eaedcd4aad1268f79998d1237dbf63700fe4ee6fe4f0ab1287f4eaee8936392
