[INFO] cloning repository https://github.com/wy15/learnrust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/wy15/learnrust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwy15%2Flearnrust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwy15%2Flearnrust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f6b0739405e073b6dfaf46983708ebfd32d7222a
[INFO] testing wy15/learnrust against master#1ef7943ee607160a564655b6596f83670ef95df5 for pr-146098-6
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwy15%2Flearnrust" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/wy15/learnrust
[INFO] finished tweaking git repo https://github.com/wy15/learnrust
[INFO] tweaked toml for git repo https://github.com/wy15/learnrust written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/wy15/learnrust on toolchain 1ef7943ee607160a564655b6596f83670ef95df5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1ef7943ee607160a564655b6596f83670ef95df5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/wy15/learnrust 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" "+1ef7943ee607160a564655b6596f83670ef95df5" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr]   |
[INFO] [stderr]   = note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr]   = note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr]   = note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr] warning: failed to write cache, path: /workspace/cargo-home/registry/index/index.crates.io-1949cf8c6b5b557f/.cache/re/ge/regex, error: No space left on device (os error 28)
[INFO] [stderr] error: failed to select a version for the requirement `serde_json = "^1.0"` (locked to 1.0.79)
[INFO] [stderr] candidate versions found which didn't match: 1.0.34, 1.0.33, 1.0.32, ...
[INFO] [stderr] location searched: crates.io index
[INFO] [stderr] required by package `reqwest v0.11.9`
[INFO] [stderr]     ... which satisfies dependency `reqwest = "^0.11"` (locked to 0.11.9) of package `challenge4 v0.1.0 (/workspace/builds/worker-3-tc1/source/challenge4)`
[INFO] [stderr]     ... which satisfies path dependency `challenge4` (locked to 0.1.0) of package `challenge v0.1.0 (/workspace/builds/worker-3-tc1/source/challenge)`
[INFO] [stderr] if you are looking for the prerelease package it needs to be specified explicitly
[INFO] [stderr]     serde_json = { version = "0.9.0-rc3" }


command failed: exit status: 101

warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
  |
  = note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
  = note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
  = note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
    Blocking waiting for file lock on package cache
    Updating crates.io index
warning: failed to write cache, path: /workspace/cargo-home/registry/index/index.crates.io-1949cf8c6b5b557f/.cache/re/ge/regex, error: No space left on device (os error 28)
error: failed to select a version for the requirement `serde_json = "^1.0"` (locked to 1.0.79)
candidate versions found which didn't match: 1.0.34, 1.0.33, 1.0.32, ...
location searched: crates.io index
required by package `reqwest v0.11.9`
    ... which satisfies dependency `reqwest = "^0.11"` (locked to 0.11.9) of package `challenge4 v0.1.0 (/workspace/builds/worker-3-tc1/source/challenge4)`
    ... which satisfies path dependency `challenge4` (locked to 0.1.0) of package `challenge v0.1.0 (/workspace/builds/worker-3-tc1/source/challenge)`
if you are looking for the prerelease package it needs to be specified explicitly
    serde_json = { version = "0.9.0-rc3" }