Add embedded book to test such that checktools works

[Mark-Simulacrum]

r? @alexcrichton

FWIW this doesn't attempt to make sure we don't break check tools again -- we intentionally make the bash script not exit when x.py fails so we'd need some special case handling so for now I'm just fixing the bug itself, not its cause.

[Mark-Simulacrum]

Introduced in #56291

[alexcrichton]

@bors: r+ p=1

[bors]

📌 Commit 57c9269 has been approved by alexcrichton

[bors]

⌛ Testing commit 57c9269 with merge 55c099e...

[bors]

💔 Test failed - status-appveyor

[Mark-Simulacrum]

@bors retry -- timeout(?)

[bors]

⌛ Testing commit 57c9269 with merge 9332e5f14a97adcfa50e0ca6eb34e39073400c7a...

[bors]

💔 Test failed - checks-travis

[rust-highfive]

Your PR failed on Travis (raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

Attempting to download s3://rust-lang-ci-sccache2/docker/67db9fe163c5d62355912bb1150078a4fc631df7a03bb9c8df81d8530147e0e964f1a6556efc4d4219ce41c1394f5d8590d0064c6e9685f299201a0fc5db40a6
[00:02:14] Attempting with retry: curl -f -L -C - -o /tmp/rustci_docker_cache https://s3-us-west-1.amazonaws.com/rust-lang-ci-sccache2/docker/67db9fe163c5d62355912bb1150078a4fc631df7a03bb9c8df81d8530147e0e964f1a6556efc4d4219ce41c1394f5d8590d0064c6e9685f299201a0fc5db40a6
[00:02:14]   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
[00:02:14]                                  Dload  Upload   Total   Spent    Left  Speed
No output has been received in the last 30m0s, this potentially indicates a stalled build or something wrong with the build itself.
Check the details on how to adjust your build configuration on: https://docs.travis-ci.com/user/common-build-problems/#Build-times-out-because-no-output-was-received
The build has been terminated

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

[Mark-Simulacrum]

@bors retry -- timeout

[bors]

⌛ Testing commit 57c9269 with merge 72184ddeed6e4f17d5d0aa73e6d835725629c11d...

[bors]

💔 Test failed - checks-travis

[rust-highfive]

The job dist-x86_64-apple of your PR failed on Travis (raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

[00:03:44]       Memory: 8 GB
[00:03:44]       Boot ROM Version: VMW71.00V.7581552.B64.1801142334
[00:03:44]       Apple ROM Info: [MS_VM_CERT/SHA1/27d66596a61c48dd3dc7216fd715126e33f59ae7]Welcome to the Virtual Machine
[00:03:44]       SMC Version (system): 2.8f0
[00:03:44]       Serial Number (system): VMSQ9fSRzBxA
[00:03:44] 
[00:03:44] hw.ncpu: 4
[00:03:44] hw.byteorder: 1234
[00:03:44] hw.memsize: 8589934592
---
[02:48:34] [TIMING] Docs { stage: 2, host: "armv7-apple-ios" } -- 80.022
[02:48:34] Dist docs (armv7s-apple-ios)
[02:49:55] [TIMING] Docs { stage: 2, host: "armv7s-apple-ios" } -- 81.081
[02:49:55] Dist docs (i386-apple-ios)
The job exceeded the maximum time limit for jobs, and has been terminated.

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

[kennytm]

@bors retry

[bors]

⌛ Testing commit 57c9269 with merge 652ae3f...

[bors]

☀️ Test successful - checks-travis, status-appveyor
Approved by: alexcrichton
Pushing 652ae3f to master...