[INFO] fetching crate mser_macro 1.0.10...
[INFO] checking mser_macro-1.0.10 against master#1f12b9b0fdbe735968ac002792a720f0ba4faca6 for crater-rollup-uwu
[INFO] extracting crate mser_macro 1.0.10 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate mser_macro 1.0.10 on toolchain 1f12b9b0fdbe735968ac002792a720f0ba4faca6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mser_macro 1.0.10
[INFO] finished tweaking crates.io crate mser_macro 1.0.10
[INFO] tweaked toml for crates.io crate mser_macro 1.0.10 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 10 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded mser v1.1.4
[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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 53cad7a8060068aca8b2b6f6bdae82401c41456d28206513d978618b517b0e34
[INFO] running `Command { std: "docker" "start" "-a" "53cad7a8060068aca8b2b6f6bdae82401c41456d28206513d978618b517b0e34", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "53cad7a8060068aca8b2b6f6bdae82401c41456d28206513d978618b517b0e34", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "53cad7a8060068aca8b2b6f6bdae82401c41456d28206513d978618b517b0e34", kill_on_drop: false }`
[INFO] [stdout] 53cad7a8060068aca8b2b6f6bdae82401c41456d28206513d978618b517b0e34
[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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 252cdd67160e148f21a9cb7950e8e208edc0676f56638a8f7c56575c789a5a43
[INFO] running `Command { std: "docker" "start" "-a" "252cdd67160e148f21a9cb7950e8e208edc0676f56638a8f7c56575c789a5a43", kill_on_drop: false }`
[INFO] [stderr]     Checking uuid v1.10.0
[INFO] [stderr]     Checking ryu v1.0.18
[INFO] [stderr]     Checking simdutf8 v0.1.4
[INFO] [stderr]     Checking itoa v1.0.11
[INFO] [stderr]     Checking mser v1.1.4
[INFO] [stderr]     Checking mser_macro v1.0.10 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/lib.rs:421:23
[INFO] [stdout]     |
[INFO] [stdout] 421 |         } else if let Some(attr) = parse_struct_attribute(&input, &lookahead)? {
[INFO] [stdout]     |                       ^^^^^^^^^^ matches no values because `StructAttribute` is uninhabited
[INFO] [stdout]     |
[INFO] [stdout]     = note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
[INFO] [stdout]     = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/lib.rs:450:16
[INFO] [stdout]     |
[INFO] [stdout] 450 |         if let Some(attr) = parse_struct_attribute(&input, &lookahead)? {
[INFO] [stdout]     |                ^^^^^^^^^^ matches no values because `StructAttribute` is uninhabited
[INFO] [stdout]     |
[INFO] [stdout]     = note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/lib.rs:506:9
[INFO] [stdout]     |
[INFO] [stdout] 506 |     for _attr in attrs {}
[INFO] [stdout]     |         ^^^^^ matches no values because `StructAttribute` is uninhabited
[INFO] [stdout]     |
[INFO] [stdout]     = note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/lib.rs:525:13
[INFO] [stdout]     |
[INFO] [stdout] 525 |             ToplevelStructAttribute::StructAttribute(attr) => {
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ matches no values because `StructAttribute` is uninhabited
[INFO] [stdout]     |
[INFO] [stdout]     = note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/lib.rs:421:23
[INFO] [stdout]     |
[INFO] [stdout] 421 |         } else if let Some(attr) = parse_struct_attribute(&input, &lookahead)? {
[INFO] [stdout]     |                       ^^^^^^^^^^ matches no values because `StructAttribute` is uninhabited
[INFO] [stdout]     |
[INFO] [stdout]     = note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
[INFO] [stdout]     = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/lib.rs:450:16
[INFO] [stdout]     |
[INFO] [stdout] 450 |         if let Some(attr) = parse_struct_attribute(&input, &lookahead)? {
[INFO] [stdout]     |                ^^^^^^^^^^ matches no values because `StructAttribute` is uninhabited
[INFO] [stdout]     |
[INFO] [stdout]     = note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/lib.rs:506:9
[INFO] [stdout]     |
[INFO] [stdout] 506 |     for _attr in attrs {}
[INFO] [stdout]     |         ^^^^^ matches no values because `StructAttribute` is uninhabited
[INFO] [stdout]     |
[INFO] [stdout]     = note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/lib.rs:525:13
[INFO] [stdout]     |
[INFO] [stdout] 525 |             ToplevelStructAttribute::StructAttribute(attr) => {
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ matches no values because `StructAttribute` is uninhabited
[INFO] [stdout]     |
[INFO] [stdout]     = note: to learn more about uninhabited types, see https://doc.rust-lang.org/nomicon/exotic-sizes.html#empty-types
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.80s
[INFO] running `Command { std: "docker" "inspect" "252cdd67160e148f21a9cb7950e8e208edc0676f56638a8f7c56575c789a5a43", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "252cdd67160e148f21a9cb7950e8e208edc0676f56638a8f7c56575c789a5a43", kill_on_drop: false }`
[INFO] [stdout] 252cdd67160e148f21a9cb7950e8e208edc0676f56638a8f7c56575c789a5a43