[INFO] fetching crate regression-test 0.1.0...
[INFO] testing regression-test-0.1.0 against master#2fd6efc32704647e64d3d646d21c4c68eae100e4 for pr-149852-1
[INFO] extracting crate regression-test 0.1.0 into /workspace/builds/worker-7-tc1/source
[INFO] started tweaking crates.io crate regression-test 0.1.0
[INFO] finished tweaking crates.io crate regression-test 0.1.0
[INFO] tweaked toml for crates.io crate regression-test 0.1.0 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate regression-test 0.1.0 on toolchain 2fd6efc32704647e64d3d646d21c4c68eae100e4
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2fd6efc32704647e64d3d646d21c4c68eae100e4" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate regression-test 0.1.0 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" "+2fd6efc32704647e64d3d646d21c4c68eae100e4" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr] error: failed to select a version for the requirement `syn = "^2.0.81"` (locked to 2.0.104)
[INFO] [stderr] candidate versions found which didn't match: 2.0.95, 2.0.94, 2.0.93, ...
[INFO] [stderr] location searched: crates.io index
[INFO] [stderr] required by package `serde_derive v1.0.219`
[INFO] [stderr]     ... which satisfies dependency `serde_derive = "=1.0.219"` (locked to 1.0.219) of package `serde v1.0.219`
[INFO] [stderr]     ... which satisfies dependency `serde = "^1.0.219"` (locked to 1.0.219) of package `regression-test v0.1.0 (/workspace/builds/worker-7-tc1/source)`


command failed: exit status: 101

    Updating crates.io index
error: failed to select a version for the requirement `syn = "^2.0.81"` (locked to 2.0.104)
candidate versions found which didn't match: 2.0.95, 2.0.94, 2.0.93, ...
location searched: crates.io index
required by package `serde_derive v1.0.219`
    ... which satisfies dependency `serde_derive = "=1.0.219"` (locked to 1.0.219) of package `serde v1.0.219`
    ... which satisfies dependency `serde = "^1.0.219"` (locked to 1.0.219) of package `regression-test v0.1.0 (/workspace/builds/worker-7-tc1/source)`