[INFO] cloning repository https://github.com/stanwu/rust-graphql
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/stanwu/rust-graphql" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fstanwu%2Frust-graphql", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fstanwu%2Frust-graphql'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 839b0b0d6eed9c7dfa560559fdc7a9fa096869e5
[INFO] checking stanwu/rust-graphql against master#e1613686e0efc80a1a18b1263625450a8de3fb04 for pr-154492
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fstanwu%2Frust-graphql" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/stanwu/rust-graphql
[INFO] finished tweaking git repo https://github.com/stanwu/rust-graphql
[INFO] tweaked toml for git repo https://github.com/stanwu/rust-graphql written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/stanwu/rust-graphql on toolchain e1613686e0efc80a1a18b1263625450a8de3fb04
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e1613686e0efc80a1a18b1263625450a8de3fb04" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/stanwu/rust-graphql 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" "+e1613686e0efc80a1a18b1263625450a8de3fb04" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr] error: failed to select a version for `serde_derive`.
[INFO] [stderr]     ... required by package `serde_core v1.0.220`
[INFO] [stderr]     ... which satisfies dependency `serde_core = "^1.0.220"` of package `time v0.3.47`
[INFO] [stderr]     ... which satisfies dependency `time = "^0.3"` (locked to 0.3.47) of package `actix-web v4.10.2`
[INFO] [stderr]     ... which satisfies dependency `actix-web = "^4.0"` (locked to 4.10.2) of package `rust-graphql v0.1.0 (/workspace/builds/worker-4-tc1/source)`
[INFO] [stderr] versions that meet the requirements `=1.0.220` are: 1.0.220
[INFO] [stderr] 
[INFO] [stderr] all possible versions conflict with previously selected packages.
[INFO] [stderr] 
[INFO] [stderr]   previously selected 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"` (locked to 1.0.219) of package `actix-web v4.10.2`
[INFO] [stderr]     ... which satisfies dependency `actix-web = "^4.0"` (locked to 4.10.2) of package `rust-graphql v0.1.0 (/workspace/builds/worker-4-tc1/source)`
[INFO] [stderr] 
[INFO] [stderr] failed to select a version for `serde_derive` which could resolve this conflict


overridden task result to prepare-fail:unknown

Caused by:
    0: uncategorized prepare error
    1: command failed: exit status: 101
       
           Updating crates.io index
       error: failed to select a version for `serde_derive`.
           ... required by package `serde_core v1.0.220`
           ... which satisfies dependency `serde_core = "^1.0.220"` of package `time v0.3.47`
           ... which satisfies dependency `time = "^0.3"` (locked to 0.3.47) of package `actix-web v4.10.2`
           ... which satisfies dependency `actix-web = "^4.0"` (locked to 4.10.2) of package `rust-graphql v0.1.0 (/workspace/builds/worker-4-tc1/source)`
       versions that meet the requirements `=1.0.220` are: 1.0.220
       
       all possible versions conflict with previously selected packages.
       
         previously selected 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"` (locked to 1.0.219) of package `actix-web v4.10.2`
           ... which satisfies dependency `actix-web = "^4.0"` (locked to 4.10.2) of package `rust-graphql v0.1.0 (/workspace/builds/worker-4-tc1/source)`
       
       failed to select a version for `serde_derive` which could resolve this conflict