tests/ui/cfg: add annotations for reference rules

[DanielEScherzer]

r? ehuss
@rustbot label +A-docs

[ehuss]

Can you say why this includes cfg.option-spec and cfg.option-name? It looks like this test is just validating the error case when the value is not a valid string (which I think is covered by cfg.option-key-value).

[DanielEScherzer]

I figured that cfg.option-key-value was saying "here is how to use cfg with a key-value pair" and that cfg.option-spec (saying that cfg options are either names or key-value pairs) and cfg.option-name (allowing names) are all tested by confirming that something other than a key-value pair is not allowed. I would say that

validating the error case when the value is not a valid string

is not just cfg.option-key-value since I read cfg.option-key-value to describe one thing that is accepted (key-value pairs where the value is a string) but on its own that rule isn't enough to say that things like foo=1x are not accepted, only with all three rules do you get the exhaustiveness

[ehuss]

Thanks!

@bors r+ rollup

[rust-bors]

📌 Commit 226b4dd has been approved by ehuss

It is now in the queue for this repository.

[rust-bors]

💔 Test for c49e635 failed: CI. Failed job:

• auto - aarch64-gnu-debug (web logs, enhanced plaintext logs)

[Zalathar]

@bors retry

[rust-log-analyzer]

The job aarch64-gnu-debug failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

/dev/sda15       98M  6.4M   92M   7% /boot/efi
tmpfs           1.6G   16K  1.6G   1% /run/user/1001
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Sufficient disk space available (120767352KB >= 52428800KB). Skipping cleanup.
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##[error]The runner has received a shutdown signal. This can happen when the runner service is stopped, or a manually started runner is canceled.
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