[INFO] cloning repository https://github.com/HPIPS/substrate-forum-module
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/HPIPS/substrate-forum-module" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FHPIPS%2Fsubstrate-forum-module", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FHPIPS%2Fsubstrate-forum-module'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1e0e6db374040d2a3fff0e87e905e9d7bf17dcb3
[INFO] checking HPIPS/substrate-forum-module against master#8f359beca4e58bc3ae795a666301a8f47023044c for pr-121557
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FHPIPS%2Fsubstrate-forum-module" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/HPIPS/substrate-forum-module on toolchain 8f359beca4e58bc3ae795a666301a8f47023044c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8f359beca4e58bc3ae795a666301a8f47023044c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/HPIPS/substrate-forum-module
[INFO] finished tweaking git repo https://github.com/HPIPS/substrate-forum-module
[INFO] tweaked toml for git repo https://github.com/HPIPS/substrate-forum-module written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/HPIPS/substrate-forum-module 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" "+8f359beca4e58bc3ae795a666301a8f47023044c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating git repository `https://github.com/paritytech/substrate.git`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr] error: failed to select a version for `syn`.
[INFO] [stderr]     ... required by package `srml-support-procedural v1.0.0 (https://github.com/paritytech/substrate.git?branch=v1.0#cc1d67e9)`
[INFO] [stderr]     ... which satisfies git dependency `srml-support-procedural` of package `substrate-forum-module v1.0.0 (/workspace/builds/worker-3-tc1/source)`
[INFO] [stderr] versions that meet the requirements `^0.15.32` are: 0.15.44, 0.15.43, 0.15.42, 0.15.41, 0.15.40, 0.15.39, 0.15.38, 0.15.37, 0.15.36, 0.15.35, 0.15.34, 0.15.33, 0.15.32
[INFO] [stderr] 
[INFO] [stderr] all possible versions conflict with previously selected packages.
[INFO] [stderr] 
[INFO] [stderr]   previously selected package `syn v0.15.31`
[INFO] [stderr]     ... which satisfies dependency `syn = "^0.15.26"` (locked to 0.15.31) of package `parity-codec-derive v3.3.0`
[INFO] [stderr]     ... which satisfies dependency `parity-codec-derive = "^3.1"` (locked to 3.3.0) of package `substrate-forum-module v1.0.0 (/workspace/builds/worker-3-tc1/source)`
[INFO] [stderr] 
[INFO] [stderr] failed to select a version for `syn` which could resolve this conflict
[ERROR] this task or one of its parent failed!
[ERROR] command failed: exit status: 101
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.