misc doc improvements for std::env

[tshepang]

No description provided.

[rust-highfive]

r? @BurntSushi

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[aidanhs]

Hi @tshepang, it looks like your PR has failed CI with

[00:44:07] Building stage0 tool linkchecker (x86_64-unknown-linux-gnu)
[00:44:07]    Compiling linkchecker v0.1.0 (file:///checkout/src/tools/linkchecker)
[00:44:10]     Finished release [optimized] target(s) in 2.77 secs
[00:44:10] Documenting standalone (x86_64-unknown-linux-gnu)
[00:44:10] Linkcheck (x86_64-unknown-linux-gnu)
[00:44:11] std/env/fn.join_paths.html:57: broken link - std/env/containing%20an%20error%20message
[00:44:16] thread 'main' panicked at 'found some broken links', /checkout/src/tools/linkchecker/main.rs:49
[00:44:16] note: Run with `RUST_BACKTRACE=1` for a backtrace.
[00:44:16] 
[00:44:16] 
[00:44:16] 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"
[00:44:16] expected success, got: exit code: 101

Could you take a look? Looking at your diff, I guess markdown isn't able to figure that the subsequent brackets aren't the link.

[tshepang]

@aidanhs thanks for that bit of guidance

[BurntSushi]

LGTM. Thanks! @bors r+

[bors]

📌 Commit b955296 has been approved by BurntSushi

[bors]

⌛ Testing commit b955296 with merge 0791e3b...

[bors]

💔 Test failed - status-travis

[Mark-Simulacrum]

[01:05:59]      Running build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/release/deps/concurrent-4e888deb515d5802
[01:05:59] 
[01:05:59] running 10 tests
[01:06:00] test concurrent_installs ... FAILED
[01:06:00] test git_same_repo_different_tags ... ok
[01:06:01] test debug_release_ok ... ok
[01:06:02] test multiple_installs ... ok
[01:06:03] test git_same_branch_different_revs ... ok
[01:06:04] test killing_cargo_releases_the_lock ... ok
[01:06:04] test no_deadlock_with_git_dependencies ... ok
[01:06:04] test one_install_should_be_bad ... ok
[01:06:05] test multiple_registry_fetches ... ok
[01:06:05] test same_project ... ok
[01:06:05] 
[01:06:05] failures:
[01:06:05] 
[01:06:05] ---- concurrent_installs stdout ----
[01:06:05] 	thread 'concurrent_installs' panicked at '
[01:06:05] Expected: execs
[01:06:05]     but: exited with exit code: 101
[01:06:05] --- stdout
[01:06:05] 
[01:06:05] --- stderr
[01:06:05]     Updating registry `file:///checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/cit/t0/registry`
[01:06:05]     Blocking waiting for file lock on the registry index
[01:06:05] error: could not find `foo` in `registry https://github.com/rust-lang/crates.io-index`
[01:06:05] ', /cargo/registry/src/git.luolix.top-1ecc6299db9ec823/hamcrest-0.1.1/src/core.rs:31
[01:06:05] note: Run with `RUST_BACKTRACE=1` for a backtrace.
[01:06:05] 
[01:06:05] 
[01:06:05] failures:
[01:06:05]     concurrent_installs
[01:06:05] 
[01:06:05] test result: FAILED. 9 passed; 1 failed; 0 ignored; 0 measured
[01:06:05] 
[01:06:05] error: test failed, to rerun pass '--test concurrent'

I've seen this before, I think, but not sure.

@bors retry

[alexcrichton]

@Mark-Simulacrum that was fixed in rust-lang/cargo#4051 , updated in rust-lang/rust in #42039 and accidentally reverted in #42073

I'll send another PR to update

[bors]

⌛ Testing commit b955296 with merge cbda421...

[bors]

💔 Test failed - status-travis

[alexcrichton]

@bors: retry

• Tracking issue for spurious network failures on bots #40474 network weirdness