[INFO] fetching crate kb 0.0.1...
[INFO] checking kb-0.0.1 against 895980e0290783bb09b1ccf1b11f14eb09b10430 for pr-160186
[INFO] extracting crate kb 0.0.1 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate kb 0.0.1
[INFO] finished tweaking crates.io crate kb 0.0.1
[INFO] tweaked toml for crates.io crate kb 0.0.1 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate kb 0.0.1 on toolchain 895980e0290783bb09b1ccf1b11f14eb09b10430
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+895980e0290783bb09b1ccf1b11f14eb09b10430" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate kb 0.0.1 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" "+895980e0290783bb09b1ccf1b11f14eb09b10430" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:77db811e55d90add9212f6832c23229e3de5f1c1f9905e8cb07319ea15df73ac" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 93d34e66f3c8c5cd532ea85f9e10690f66747bc6c3a2789abc95ffc1c72d91bd
[INFO] running `Command { std: "docker" "start" "93d34e66f3c8c5cd532ea85f9e10690f66747bc6c3a2789abc95ffc1c72d91bd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "93d34e66f3c8c5cd532ea85f9e10690f66747bc6c3a2789abc95ffc1c72d91bd", 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" "93d34e66f3c8c5cd532ea85f9e10690f66747bc6c3a2789abc95ffc1c72d91bd" "/opt/rustwide/cargo-home/bin/cargo" "+895980e0290783bb09b1ccf1b11f14eb09b10430" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "93d34e66f3c8c5cd532ea85f9e10690f66747bc6c3a2789abc95ffc1c72d91bd", 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=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-w" "/opt/rustwide/workdir" "--user" "0:0" "93d34e66f3c8c5cd532ea85f9e10690f66747bc6c3a2789abc95ffc1c72d91bd" "/opt/rustwide/cargo-home/bin/cargo" "+895980e0290783bb09b1ccf1b11f14eb09b10430" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]     Checking kb v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `pos` is never read
[INFO] [stdout]    --> src/code.rs:168:9
[INFO] [stdout]     |
[INFO] [stdout] 168 |         pos = 0;
[INFO] [stdout]     |         ^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 200 |             pos += 1;
[INFO] [stdout]     |             -------- `pos` is overwritten here before the previous value is read
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `pos` is never read
[INFO] [stdout]    --> src/code.rs:200:13
[INFO] [stdout]     |
[INFO] [stdout] 200 |             pos += 1;
[INFO] [stdout]     |             ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `pos` is never read
[INFO] [stdout]    --> src/code.rs:168:9
[INFO] [stdout]     |
[INFO] [stdout] 168 |         pos = 0;
[INFO] [stdout]     |         ^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 200 |             pos += 1;
[INFO] [stdout]     |             -------- `pos` is overwritten here before the previous value is read
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `pos` is never read
[INFO] [stdout]    --> src/code.rs:200:13
[INFO] [stdout]     |
[INFO] [stdout] 200 |             pos += 1;
[INFO] [stdout]     |             ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/lexer.rs:81:20
[INFO] [stdout]    |
[INFO] [stdout] 81 | pub fn lex(source: &Rc<Source>) -> Result<Vec<(Token, Mark)>, BasicError> {
[INFO] [stdout]    |                    ^^^^^^^^^^^                 ^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                    |
[INFO] [stdout]    |                    the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 81 | pub fn lex(source: &Rc<Source>) -> Result<Vec<(Token<'_>, Mark)>, BasicError> {
[INFO] [stdout]    |                                                     ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lexer.rs:410:15
[INFO] [stdout]     |
[INFO] [stdout] 410 |     fn new(s: &str) -> Chars {
[INFO] [stdout]     |               ^^^^     ^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |               |
[INFO] [stdout]     |               the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 410 |     fn new(s: &str) -> Chars<'_> {
[INFO] [stdout]     |                             ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/rcstr.rs:38:14
[INFO] [stdout]    |
[INFO] [stdout] 38 |     fn chars(&self) -> Ref<Chars> {
[INFO] [stdout]    |              ^^^^^     ^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |              |
[INFO] [stdout]    |              the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 38 |     fn chars(&self) -> Ref<'_, Chars> {
[INFO] [stdout]    |                            +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/val.rs:219:19
[INFO] [stdout]     |
[INFO] [stdout] 219 |     pub fn borrow(&self) -> Ref<Vec<Val>> {
[INFO] [stdout]     |                   ^^^^^     ^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                   |
[INFO] [stdout]     |                   the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 219 |     pub fn borrow(&self) -> Ref<'_, Vec<Val>> {
[INFO] [stdout]     |                                 +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/val.rs:222:23
[INFO] [stdout]     |
[INFO] [stdout] 222 |     pub fn borrow_mut(&self) -> RefMut<Vec<Val>> {
[INFO] [stdout]     |                       ^^^^^     ^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                       |
[INFO] [stdout]     |                       the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 222 |     pub fn borrow_mut(&self) -> RefMut<'_, Vec<Val>> {
[INFO] [stdout]     |                                        +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/lexer.rs:81:20
[INFO] [stdout]    |
[INFO] [stdout] 81 | pub fn lex(source: &Rc<Source>) -> Result<Vec<(Token, Mark)>, BasicError> {
[INFO] [stdout]    |                    ^^^^^^^^^^^                 ^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                    |
[INFO] [stdout]    |                    the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 81 | pub fn lex(source: &Rc<Source>) -> Result<Vec<(Token<'_>, Mark)>, BasicError> {
[INFO] [stdout]    |                                                     ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lexer.rs:410:15
[INFO] [stdout]     |
[INFO] [stdout] 410 |     fn new(s: &str) -> Chars {
[INFO] [stdout]     |               ^^^^     ^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |               |
[INFO] [stdout]     |               the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 410 |     fn new(s: &str) -> Chars<'_> {
[INFO] [stdout]     |                             ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lexer.rs:448:17
[INFO] [stdout]     |
[INFO] [stdout] 448 |     fn lex(src: &Rc<Source>) -> Vec<Token> {
[INFO] [stdout]     |                 ^^^^^^^^^^^         ^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 448 |     fn lex(src: &Rc<Source>) -> Vec<Token<'_>> {
[INFO] [stdout]     |                                          ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/rcstr.rs:38:14
[INFO] [stdout]    |
[INFO] [stdout] 38 |     fn chars(&self) -> Ref<Chars> {
[INFO] [stdout]    |              ^^^^^     ^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |              |
[INFO] [stdout]    |              the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 38 |     fn chars(&self) -> Ref<'_, Chars> {
[INFO] [stdout]    |                            +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/val.rs:219:19
[INFO] [stdout]     |
[INFO] [stdout] 219 |     pub fn borrow(&self) -> Ref<Vec<Val>> {
[INFO] [stdout]     |                   ^^^^^     ^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                   |
[INFO] [stdout]     |                   the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 219 |     pub fn borrow(&self) -> Ref<'_, Vec<Val>> {
[INFO] [stdout]     |                                 +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/val.rs:222:23
[INFO] [stdout]     |
[INFO] [stdout] 222 |     pub fn borrow_mut(&self) -> RefMut<Vec<Val>> {
[INFO] [stdout]     |                       ^^^^^     ^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                       |
[INFO] [stdout]     |                       the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 222 |     pub fn borrow_mut(&self) -> RefMut<'_, Vec<Val>> {
[INFO] [stdout]     |                                        +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.99s
[INFO] running `Command { std: "docker" "inspect" "93d34e66f3c8c5cd532ea85f9e10690f66747bc6c3a2789abc95ffc1c72d91bd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "93d34e66f3c8c5cd532ea85f9e10690f66747bc6c3a2789abc95ffc1c72d91bd", kill_on_drop: false }`
[INFO] [stdout] 93d34e66f3c8c5cd532ea85f9e10690f66747bc6c3a2789abc95ffc1c72d91bd
