[INFO] fetching crate muncher 0.7.0...
[INFO] checking muncher-0.7.0 against try#a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d for pr-145342-1
[INFO] extracting crate muncher 0.7.0 into /workspace/builds/worker-5-tc2/source
[INFO] started tweaking crates.io crate muncher 0.7.0
[INFO] finished tweaking crates.io crate muncher 0.7.0
[INFO] tweaked toml for crates.io crate muncher 0.7.0 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate muncher 0.7.0 on toolchain a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "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/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a7215d8e689c4522426efba34aae2a77d3a96bfe10164c55961cf290a6d59b7c
[INFO] running `Command { std: "docker" "start" "-a" "a7215d8e689c4522426efba34aae2a77d3a96bfe10164c55961cf290a6d59b7c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a7215d8e689c4522426efba34aae2a77d3a96bfe10164c55961cf290a6d59b7c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a7215d8e689c4522426efba34aae2a77d3a96bfe10164c55961cf290a6d59b7c", kill_on_drop: false }`
[INFO] [stdout] a7215d8e689c4522426efba34aae2a77d3a96bfe10164c55961cf290a6d59b7c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 60ef27211e9556a161b8216d54fc850d0b336ff1dca97d566905154c67ffa17a
[INFO] running `Command { std: "docker" "start" "-a" "60ef27211e9556a161b8216d54fc850d0b336ff1dca97d566905154c67ffa17a", kill_on_drop: false }`
[INFO] [stderr]     Checking muncher v0.7.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: fields `input` and `pos` are never read
[INFO] [stdout]   --> src/muncher.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub struct Stack<'a> {
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] 16 |     input: &'a str,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 17 |     stack: Vec<char>,
[INFO] [stdout] 18 |     pos: (usize, usize),
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Stack` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/muncher.rs:185:17
[INFO] [stdout]     |
[INFO] [stdout] 185 |     pub fn fork(&self) -> Fork {
[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] 185 |     pub fn fork(&self) -> Fork<'_> {
[INFO] [stdout]     |                               ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/muncher.rs:200:24
[INFO] [stdout]     |
[INFO] [stdout] 200 |     pub fn brace_stack(&self) -> Stack {
[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] 200 |     pub fn brace_stack(&self) -> Stack<'_> {
[INFO] [stdout]     |                                       ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `input` and `pos` are never read
[INFO] [stdout]   --> src/muncher.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub struct Stack<'a> {
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] 16 |     input: &'a str,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 17 |     stack: Vec<char>,
[INFO] [stdout] 18 |     pos: (usize, usize),
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Stack` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/muncher.rs:185:17
[INFO] [stdout]     |
[INFO] [stdout] 185 |     pub fn fork(&self) -> Fork {
[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] 185 |     pub fn fork(&self) -> Fork<'_> {
[INFO] [stdout]     |                               ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/muncher.rs:200:24
[INFO] [stdout]     |
[INFO] [stdout] 200 |     pub fn brace_stack(&self) -> Stack {
[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] 200 |     pub fn brace_stack(&self) -> Stack<'_> {
[INFO] [stdout]     |                                       ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.31s
[INFO] running `Command { std: "docker" "inspect" "60ef27211e9556a161b8216d54fc850d0b336ff1dca97d566905154c67ffa17a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "60ef27211e9556a161b8216d54fc850d0b336ff1dca97d566905154c67ffa17a", kill_on_drop: false }`
[INFO] [stdout] 60ef27211e9556a161b8216d54fc850d0b336ff1dca97d566905154c67ffa17a