docs(unstable): Improve nightly link

[epage]

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[rustbot]

r? @ehuss

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[weihanglo]

Unlucky?

let's see

---- freshness::rebuild_tests_if_lib_changes stdout ----
running `/Users/runner/work/cargo/cargo/target/debug/cargo build`
running `/Users/runner/work/cargo/cargo/target/debug/cargo test`
running `/Users/runner/work/cargo/cargo/target/debug/cargo build -v`
running `/Users/runner/work/cargo/cargo/target/debug/cargo test -v`
thread 'freshness::rebuild_tests_if_lib_changes' panicked at tests/testsuite/freshness.rs:633:10:

---- expected: tests/testsuite/freshness.rs:623:27
++++ actual:   stderr
   1    1 | [DIRTY] foo v0.0.1 ([ROOT]/foo): the dependency foo was rebuilt ([TIME_DIFF_AFTER_LAST_BUILD])
   2    2 | [COMPILING] foo v0.0.1 ([ROOT]/foo)
   3    3 | [RUNNING] `rustc --crate-name foo [..]
   4      - [RUNNING] `rustc --crate-name foo [..]
   5    4 | error[E0425]: cannot find function `foo` in crate `foo`
        5 +  --> tests/foo.rs:4:34
   6    6 | ...
   7    7 | [ERROR] could not compile `foo` (test "foo") due to 1 previous error
   8    8 | ...∅

[weihanglo]

@bors r+

[bors]

📌 Commit dc53eb2 has been approved by weihanglo

It is now in the queue for this repository.

[bors]

⌛ Testing commit dc53eb2 with merge 5ff9328...

[bors]

☀️ Test successful - checks-actions
Approved by: weihanglo
Pushing 5ff9328 to master...