update mdbook

[RalfJung]

Fixes

warning: Package toml v0.4.5 does not have feature serde. It has a required dependency with that name, but only optional dependencies can be used as features. This is currently a warning to ease the transition, but it will become an error in the future.

[rust-highfive]

r? @alexcrichton

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[RalfJung]

Ah dang, seems mdbook actually (re)moved some stuff. :/

I will leave this to someone who knows that code better, then.

[RalfJung]

Actually this wasn't so hard. I removed the test code as there actually is no test subcommand registered with the clap::App.

[kennytm]

linkchecker reports hundreds of broken links.

[01:14:55] grammar.html:399: broken link fragment `#number-literals` pointing to `reference/tokens.html`
[01:14:55] nomicon/print.html:464: broken link fragment `#dynamically-sized-types-dsts` pointing to `nomicon/exotic-sizes.html`
[01:14:55] nomicon/print.html:1181: broken link fragment `#example-aliasing-a-mutable-reference` pointing to `nomicon/lifetimes.html`
[01:14:55] nomicon/print.html:5444: broken link fragment `#foreign-calling-conventions` pointing to `nomicon/ffi.html`
[01:14:55] nomicon/repr-rust.html:101: broken link fragment `#dynamically-sized-types-dsts` pointing to `nomicon/exotic-sizes.html`
[01:14:55] nomicon/lifetime-mismatch.html:123: broken link fragment `#example-aliasing-a-mutable-reference` pointing to `nomicon/lifetimes.html`
...
[01:15:05] rustdoc/passes.html:94: broken link fragment `#--passes-add-more-rustdoc-passes` pointing to `rustdoc/command-line-arguments.html`
[01:15:05] rustdoc/passes.html:95: broken link fragment `#--no-defaults-dont-run-default-passes` pointing to `rustdoc/command-line-arguments.html`
[01:15:05] thread 'main' panicked at 'found some broken links', /checkout/src/tools/linkchecker/main.rs:49:8
[01:15:05] note: Run with `RUST_BACKTRACE=1` for a backtrace.
[01:15:05] 
[01:15:05] 
[01:15:05] command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-tools/x86_64-unknown-linux-gnu/release/linkchecker" "/checkout/obj/build/x86_64-unknown-linux-gnu/doc"
[01:15:05] expected success, got: exit code: 101
[01:15:05] 
[01:15:05] 
[01:15:05] failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test
[01:15:05] Build completed unsuccessfully in 0:31:30
[01:15:05] make: *** [check] Error 1
[01:15:05] Makefile:52: recipe for target 'check' failed

[alexcrichton]

I think @steveklabnik was working on those regressions in mdbook (or at least knew of what was happening)

[RalfJung]

Yeah, seems like this is not just a smooth upgrade and "just" fixing the warning won't happen. Oh well.

[steveklabnik]

Yes, I am working on this issue, sorry. We need https://github.com/azerupi/mdBook/pull/419 to land, and then I can cut an mdBook, and then we can do the upgrade.