[INFO] cloning repository https://github.com/aep/zz
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/aep/zz" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faep%2Fzz"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faep%2Fzz'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] db26999085c43a98815088e6d4e3ebceaaa65a40
[INFO] checking aep/zz against master#2748a9fd93dd1a00a4521f4f16de5befbf77f6cd for pr-62262-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faep%2Fzz" "/workspace/builds/worker-6/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/aep/zz on toolchain 2748a9fd93dd1a00a4521f4f16de5befbf77f6cd
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/aep/zz
[INFO] finished tweaking git repo https://github.com/aep/zz
[INFO] tweaked toml for git repo https://github.com/aep/zz written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/aep/zz already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 9ea2e7706982a04239e636e9c36617c58ea6d457951d79bde9145b684ff54b7e
[INFO] running `"docker" "start" "-a" "9ea2e7706982a04239e636e9c36617c58ea6d457951d79bde9145b684ff54b7e"`
[INFO] [stderr]    Compiling syn v0.15.36
[INFO] [stderr]    Compiling fasthash-sys v0.3.2
[INFO] [stderr]     Checking xoroshiro128 v0.3.0
[INFO] [stderr]     Checking pbr v1.0.1
[INFO] [stderr]     Checking env_logger v0.6.1
[INFO] [stderr]     Checking rayon-core v1.5.0
[INFO] [stderr]     Checking rayon v1.1.0
[INFO] [stderr]    Compiling pest_generator v2.1.0
[INFO] [stderr]     Checking fasthash v0.4.0
[INFO] [stderr]    Compiling serde_derive v1.0.92
[INFO] [stderr]    Compiling pest_derive v2.1.0
[INFO] [stderr]     Checking serde v1.0.92
[INFO] [stderr]     Checking serde_json v1.0.40
[INFO] [stderr]     Checking toml v0.5.1
[INFO] [stderr]     Checking zz v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unnecessary parentheses around pattern
[INFO] [stderr]    --> src/emitter.rs:294:13
[INFO] [stderr]     |
[INFO] [stderr] 294 |         let (names) = match &ast.def {
[INFO] [stderr]     |             ^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around pattern
[INFO] [stderr]    --> src/emitter.rs:294:13
[INFO] [stderr]     |
[INFO] [stderr] 294 |         let (names) = match &ast.def {
[INFO] [stderr]     |             ^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `header`
[INFO] [stderr]    --> src/main.rs:216:13
[INFO] [stderr]     |
[INFO] [stderr] 216 |         let header  = header.emit();
[INFO] [stderr]     |             ^^^^^^ help: consider prefixing with an underscore: `_header`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `v`
[INFO] [stderr]    --> src/main.rs:172:37
[INFO] [stderr]     |
[INFO] [stderr] 172 |                 toml::Value::String(v) => {
[INFO] [stderr]     |                                     ^ help: consider prefixing with an underscore: `_v`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `pp`
[INFO] [stderr]    --> src/main.rs:310:9
[INFO] [stderr]     |
[INFO] [stderr] 310 |     let pp = std::env::current_dir().unwrap();
[INFO] [stderr]     |         ^^ help: consider prefixing with an underscore: `_pp`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `typloc`
[INFO] [stderr]    --> src/parser.rs:689:21
[INFO] [stderr]     |
[INFO] [stderr] 689 |                 let typloc = Location{
[INFO] [stderr]     |                     ^^^^^^ help: consider prefixing with an underscore: `_typloc`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `tagloc`
[INFO] [stderr]    --> src/parser.rs:749:17
[INFO] [stderr]     |
[INFO] [stderr] 749 |             let tagloc = Location{
[INFO] [stderr]     |                 ^^^^^^ help: consider prefixing with an underscore: `_tagloc`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `packed`
[INFO] [stderr]    --> src/emitter.rs:314:22
[INFO] [stderr]     |
[INFO] [stderr] 314 |         let (fields, packed) = match &ast.def {
[INFO] [stderr]     |                      ^^^^^^ help: consider prefixing with an underscore: `_packed`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `names`
[INFO] [stderr]    --> src/abs.rs:524:28
[INFO] [stderr]     |
[INFO] [stderr] 524 |             ast::Def::Enum{names,..} => {
[INFO] [stderr]     |                            ^^^^^ help: try ignoring the field: `names: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `args`
[INFO] [stderr]     --> src/lifetimes.rs:1007:29
[INFO] [stderr]      |
[INFO] [stderr] 1007 |             ast::Def::Macro{args, body} => {
[INFO] [stderr]      |                             ^^^^ help: try ignoring the field: `args: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `body`
[INFO] [stderr]     --> src/lifetimes.rs:1007:35
[INFO] [stderr]      |
[INFO] [stderr] 1007 |             ast::Def::Macro{args, body} => {
[INFO] [stderr]      |                                   ^^^^ help: try ignoring the field: `body: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `expr`
[INFO] [stderr]     --> src/lifetimes.rs:1012:36
[INFO] [stderr]      |
[INFO] [stderr] 1012 |             ast::Def::Const{typed, expr} => {
[INFO] [stderr]      |                                    ^^^^ help: try ignoring the field: `expr: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `expr`
[INFO] [stderr]     --> src/lifetimes.rs:1017:37
[INFO] [stderr]      |
[INFO] [stderr] 1017 |             ast::Def::Static{typed, expr, storage, tags} => {
[INFO] [stderr]      |                                     ^^^^ help: try ignoring the field: `expr: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `storage`
[INFO] [stderr]     --> src/lifetimes.rs:1017:43
[INFO] [stderr]      |
[INFO] [stderr] 1017 |             ast::Def::Static{typed, expr, storage, tags} => {
[INFO] [stderr]      |                                           ^^^^^^^ help: try ignoring the field: `storage: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ptr`
[INFO] [stderr]    --> src/lifetimes.rs:144:21
[INFO] [stderr]     |
[INFO] [stderr] 144 |         if let Some(ptr) = self.cur().locals.get(&name) {
[INFO] [stderr]     |                     ^^^ help: consider prefixing with an underscore: `_ptr`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `rhs`
[INFO] [stderr]    --> src/lifetimes.rs:617:48
[INFO] [stderr]     |
[INFO] [stderr] 617 |             ast::Expression::ArrayAccess {lhs, rhs, ..} => {
[INFO] [stderr]     |                                                ^^^ help: try ignoring the field: `rhs: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `callloc`
[INFO] [stderr]    --> src/lifetimes.rs:631:64
[INFO] [stderr]     |
[INFO] [stderr] 631 |             ast::Expression::Call { name, args: callargs, loc: callloc, .. } => {
[INFO] [stderr]     |                                                                ^^^^^^^ help: consider prefixing with an underscore: `_callloc`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `loc`
[INFO] [stderr]    --> src/lifetimes.rs:644:41
[INFO] [stderr]     |
[INFO] [stderr] 644 | ...                   let (v, loc) = cs.iter().next().unwrap();
[INFO] [stderr]     |                               ^^^ help: consider prefixing with an underscore: `_loc`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `op`
[INFO] [stderr]    --> src/lifetimes.rs:724:55
[INFO] [stderr]     |
[INFO] [stderr] 724 |             ast::Expression::UnaryPost {expr, ref mut op, ..}=> {
[INFO] [stderr]     |                                               --------^^
[INFO] [stderr]     |                                               |
[INFO] [stderr]     |                                               help: try ignoring the field: `op: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `loc`
[INFO] [stderr]    --> src/lifetimes.rs:727:50
[INFO] [stderr]     |
[INFO] [stderr] 727 |             ast::Expression::UnaryPre {expr, op, loc}=> {
[INFO] [stderr]     |                                                  ^^^ help: try ignoring the field: `loc: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `loc`
[INFO] [stderr]    --> src/lifetimes.rs:775:42
[INFO] [stderr]     |
[INFO] [stderr] 775 |             ast::Expression::StructInit {loc, typed, fields} => {
[INFO] [stderr]     |                                          ^^^ help: try ignoring the field: `loc: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `typed`
[INFO] [stderr]    --> src/lifetimes.rs:775:47
[INFO] [stderr]     |
[INFO] [stderr] 775 |             ast::Expression::StructInit {loc, typed, fields} => {
[INFO] [stderr]     |                                               ^^^^^ help: try ignoring the field: `typed: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `loc`
[INFO] [stderr]    --> src/lifetimes.rs:885:34
[INFO] [stderr]     |
[INFO] [stderr] 885 |             ast::Statement::Expr{loc, expr} => {
[INFO] [stderr]     |                                  ^^^ help: try ignoring the field: `loc: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `loc`
[INFO] [stderr]    --> src/lifetimes.rs:907:46
[INFO] [stderr]     |
[INFO] [stderr] 907 |             ast::Statement::Assign{lhs, rhs, loc, ..} => {
[INFO] [stderr]     |                                              ^^^ help: try ignoring the field: `loc: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `val`
[INFO] [stderr]    --> src/lifetimes.rs:946:25
[INFO] [stderr]     |
[INFO] [stderr] 946 |                     let val = self.check_expr(expr, Access::Value);
[INFO] [stderr]     |                         ^^^ help: consider prefixing with an underscore: `_val`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `rptr`
[INFO] [stderr]    --> src/lifetimes.rs:947:33
[INFO] [stderr]     |
[INFO] [stderr] 947 |                     if let Some(rptr) = self.current_return_ptr {
[INFO] [stderr]     |                                 ^^^^ help: consider prefixing with an underscore: `_rptr`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `loc`
[INFO] [stderr]    --> src/lifetimes.rs:964:36
[INFO] [stderr]     |
[INFO] [stderr] 964 |             ast::Statement::Switch{loc, expr, cases, default} => {
[INFO] [stderr]     |                                    ^^^ help: try ignoring the field: `loc: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `val`
[INFO] [stderr]    --> src/lifetimes.rs:965:21
[INFO] [stderr]     |
[INFO] [stderr] 965 |                 let val = self.check_expr(expr, Access::Value);
[INFO] [stderr]     |                     ^^^ help: consider prefixing with an underscore: `_val`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `val`
[INFO] [stderr]    --> src/lifetimes.rs:967:25
[INFO] [stderr]     |
[INFO] [stderr] 967 |                     let val = self.check_expr(expr, Access::Value);
[INFO] [stderr]     |                         ^^^ help: consider prefixing with an underscore: `_val`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `header`
[INFO] [stderr]    --> src/main.rs:216:13
[INFO] [stderr]     |
[INFO] [stderr] 216 |         let header  = header.emit();
[INFO] [stderr]     |             ^^^^^^ help: consider prefixing with an underscore: `_header`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `v`
[INFO] [stderr]    --> src/main.rs:172:37
[INFO] [stderr]     |
[INFO] [stderr] 172 |                 toml::Value::String(v) => {
[INFO] [stderr]     |                                     ^ help: consider prefixing with an underscore: `_v`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `pp`
[INFO] [stderr]    --> src/main.rs:310:9
[INFO] [stderr]     |
[INFO] [stderr] 310 |     let pp = std::env::current_dir().unwrap();
[INFO] [stderr]     |         ^^ help: consider prefixing with an underscore: `_pp`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `typloc`
[INFO] [stderr]    --> src/parser.rs:689:21
[INFO] [stderr]     |
[INFO] [stderr] 689 |                 let typloc = Location{
[INFO] [stderr]     |                     ^^^^^^ help: consider prefixing with an underscore: `_typloc`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `tagloc`
[INFO] [stderr]    --> src/parser.rs:749:17
[INFO] [stderr]     |
[INFO] [stderr] 749 |             let tagloc = Location{
[INFO] [stderr]     |                 ^^^^^^ help: consider prefixing with an underscore: `_tagloc`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `packed`
[INFO] [stderr]    --> src/emitter.rs:314:22
[INFO] [stderr]     |
[INFO] [stderr] 314 |         let (fields, packed) = match &ast.def {
[INFO] [stderr]     |                      ^^^^^^ help: consider prefixing with an underscore: `_packed`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `names`
[INFO] [stderr]    --> src/abs.rs:524:28
[INFO] [stderr]     |
[INFO] [stderr] 524 |             ast::Def::Enum{names,..} => {
[INFO] [stderr]     |                            ^^^^^ help: try ignoring the field: `names: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `args`
[INFO] [stderr]     --> src/lifetimes.rs:1007:29
[INFO] [stderr]      |
[INFO] [stderr] 1007 |             ast::Def::Macro{args, body} => {
[INFO] [stderr]      |                             ^^^^ help: try ignoring the field: `args: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `body`
[INFO] [stderr]     --> src/lifetimes.rs:1007:35
[INFO] [stderr]      |
[INFO] [stderr] 1007 |             ast::Def::Macro{args, body} => {
[INFO] [stderr]      |                                   ^^^^ help: try ignoring the field: `body: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `expr`
[INFO] [stderr]     --> src/lifetimes.rs:1012:36
[INFO] [stderr]      |
[INFO] [stderr] 1012 |             ast::Def::Const{typed, expr} => {
[INFO] [stderr]      |                                    ^^^^ help: try ignoring the field: `expr: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `expr`
[INFO] [stderr]     --> src/lifetimes.rs:1017:37
[INFO] [stderr]      |
[INFO] [stderr] 1017 |             ast::Def::Static{typed, expr, storage, tags} => {
[INFO] [stderr]      |                                     ^^^^ help: try ignoring the field: `expr: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `storage`
[INFO] [stderr]     --> src/lifetimes.rs:1017:43
[INFO] [stderr]      |
[INFO] [stderr] 1017 |             ast::Def::Static{typed, expr, storage, tags} => {
[INFO] [stderr]      |                                           ^^^^^^^ help: try ignoring the field: `storage: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ptr`
[INFO] [stderr]    --> src/lifetimes.rs:144:21
[INFO] [stderr]     |
[INFO] [stderr] 144 |         if let Some(ptr) = self.cur().locals.get(&name) {
[INFO] [stderr]     |                     ^^^ help: consider prefixing with an underscore: `_ptr`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `rhs`
[INFO] [stderr]    --> src/lifetimes.rs:617:48
[INFO] [stderr]     |
[INFO] [stderr] 617 |             ast::Expression::ArrayAccess {lhs, rhs, ..} => {
[INFO] [stderr]     |                                                ^^^ help: try ignoring the field: `rhs: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `callloc`
[INFO] [stderr]    --> src/lifetimes.rs:631:64
[INFO] [stderr]     |
[INFO] [stderr] 631 |             ast::Expression::Call { name, args: callargs, loc: callloc, .. } => {
[INFO] [stderr]     |                                                                ^^^^^^^ help: consider prefixing with an underscore: `_callloc`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `loc`
[INFO] [stderr]    --> src/lifetimes.rs:644:41
[INFO] [stderr]     |
[INFO] [stderr] 644 | ...                   let (v, loc) = cs.iter().next().unwrap();
[INFO] [stderr]     |                               ^^^ help: consider prefixing with an underscore: `_loc`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `op`
[INFO] [stderr]    --> src/lifetimes.rs:724:55
[INFO] [stderr]     |
[INFO] [stderr] 724 |             ast::Expression::UnaryPost {expr, ref mut op, ..}=> {
[INFO] [stderr]     |                                               --------^^
[INFO] [stderr]     |                                               |
[INFO] [stderr]     |                                               help: try ignoring the field: `op: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `loc`
[INFO] [stderr]    --> src/lifetimes.rs:727:50
[INFO] [stderr]     |
[INFO] [stderr] 727 |             ast::Expression::UnaryPre {expr, op, loc}=> {
[INFO] [stderr]     |                                                  ^^^ help: try ignoring the field: `loc: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `loc`
[INFO] [stderr]    --> src/lifetimes.rs:775:42
[INFO] [stderr]     |
[INFO] [stderr] 775 |             ast::Expression::StructInit {loc, typed, fields} => {
[INFO] [stderr]     |                                          ^^^ help: try ignoring the field: `loc: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `typed`
[INFO] [stderr]    --> src/lifetimes.rs:775:47
[INFO] [stderr]     |
[INFO] [stderr] 775 |             ast::Expression::StructInit {loc, typed, fields} => {
[INFO] [stderr]     |                                               ^^^^^ help: try ignoring the field: `typed: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `loc`
[INFO] [stderr]    --> src/lifetimes.rs:885:34
[INFO] [stderr]     |
[INFO] [stderr] 885 |             ast::Statement::Expr{loc, expr} => {
[INFO] [stderr]     |                                  ^^^ help: try ignoring the field: `loc: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `loc`
[INFO] [stderr]    --> src/lifetimes.rs:907:46
[INFO] [stderr]     |
[INFO] [stderr] 907 |             ast::Statement::Assign{lhs, rhs, loc, ..} => {
[INFO] [stderr]     |                                              ^^^ help: try ignoring the field: `loc: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `val`
[INFO] [stderr]    --> src/lifetimes.rs:946:25
[INFO] [stderr]     |
[INFO] [stderr] 946 |                     let val = self.check_expr(expr, Access::Value);
[INFO] [stderr]     |                         ^^^ help: consider prefixing with an underscore: `_val`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `rptr`
[INFO] [stderr]    --> src/lifetimes.rs:947:33
[INFO] [stderr]     |
[INFO] [stderr] 947 |                     if let Some(rptr) = self.current_return_ptr {
[INFO] [stderr]     |                                 ^^^^ help: consider prefixing with an underscore: `_rptr`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `loc`
[INFO] [stderr]    --> src/lifetimes.rs:964:36
[INFO] [stderr]     |
[INFO] [stderr] 964 |             ast::Statement::Switch{loc, expr, cases, default} => {
[INFO] [stderr]     |                                    ^^^ help: try ignoring the field: `loc: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `val`
[INFO] [stderr]    --> src/lifetimes.rs:965:21
[INFO] [stderr]     |
[INFO] [stderr] 965 |                 let val = self.check_expr(expr, Access::Value);
[INFO] [stderr]     |                     ^^^ help: consider prefixing with an underscore: `_val`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `val`
[INFO] [stderr]    --> src/lifetimes.rs:967:25
[INFO] [stderr]     |
[INFO] [stderr] 967 |                     let val = self.check_expr(expr, Access::Value);
[INFO] [stderr]     |                         ^^^ help: consider prefixing with an underscore: `_val`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lifetimes.rs:995:13
[INFO] [stderr]     |
[INFO] [stderr] 995 |         let mut tags = Tags::new();
[INFO] [stderr]     |             ----^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `name`
[INFO] [stderr]   --> src/lifetimes.rs:75:5
[INFO] [stderr]    |
[INFO] [stderr] 75 |     name:       String,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lifetimes.rs:995:13
[INFO] [stderr]     |
[INFO] [stderr] 995 |         let mut tags = Tags::new();
[INFO] [stderr]     |             ----^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `name`
[INFO] [stderr]   --> src/lifetimes.rs:75:5
[INFO] [stderr]    |
[INFO] [stderr] 75 |     name:       String,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 03s
[INFO] running `"docker" "inspect" "9ea2e7706982a04239e636e9c36617c58ea6d457951d79bde9145b684ff54b7e"`
[INFO] running `"docker" "rm" "-f" "9ea2e7706982a04239e636e9c36617c58ea6d457951d79bde9145b684ff54b7e"`
[INFO] [stdout] 9ea2e7706982a04239e636e9c36617c58ea6d457951d79bde9145b684ff54b7e