failed to install rustc from source code,error unknown token.

[ggaaooppeenngg]

<stdin>:1:24: 1:25 error: unknown start of token: `
<stdin>:1 (A.) the Drop impl for `D` instantiates `D` at 'a directly,
                                 ^
thread '<unnamed>' panicked at 'Box<Any>', /home/tuoye.gp/workspace/rust/src/libsyntax/parse/lexer/mod.rs:167
thread '<main>' panicked at 'called `Result::unwrap()` on an `Err` value: Any', /home/tuoye.gp/workspace/rust/src/libcore/result.rs:729
/home/tuoye.gp/workspace/rust/mk/docs.mk:264: recipe for target 'doc/rustc_typeck/index.html' failed
make[1]: *** [doc/rustc_typeck/index.html] Error 101
make[1]: Leaving directory '/home/tuoye.gp/workspace/rust'
/home/tuoye.gp/workspace/rust/mk/install.mk:16: recipe for target 'install' failed
make: *** [install] Error 2

I got the message above,how to fix it?

[brson]

Urgh. This should never have gotten through the CI bots. Some rules must be being built by the install target that aren't under the normal build.

[brson]

I will try to look into this today while I'm investigating other nightly breakage.

[pnkfelix]

I assume this is being introduced by the doc comment I wrote here:

rust/src/librustc_typeck/check/dropck.rs

Line 245 in b5b5a17

/// (A.) the Drop impl for `D` instantiates `D` at 'a directly,

So the two bugs here are:

1. Fix the above doc comment in dropck. (Presumably just replace the indents with nested bullets.)
2. What rules do we need to change to synchronize make install with the CI bots (to catch this kind of case in the future) -- presumably its happening because make install attempts to build documentation for rust itself ... which sounds a lot like good old: make targets: consider making doc generation part of default target #14424 ; see also Buildbot should not only test "make check" but also "make install" #19698

[brson]

I posted a PR to stop building compiler docs. It does not fix the bug in the docs though. #25717

[brson]

Fixed.

[brson]

Er, oh yeah, the underlying problem is not fixed, that the docs have broken examples.

[brson]

Sigh, actually, I'll call this fixed since the title of the bug is about install failure and that works now. Broken examples in the rustc crate are nbd to me atm.