Completion for `RegExp` class name and specific members (not inherited) shows as deprecated

[FMorschel]

Coming from #62012:

---

After the first steps for #60504 and #55608, now we have:

@Deprecated.implement(
  "This class will become 'final' in a future release. "
  "'Pattern' may be a more appropriate interface to implement.",
)
abstract interface class RegExp implements Pattern {

Small repro:

void foo(RegExp myRegExp) {
  foo(RegExp('.'));
  myRegExp.;
}

But with this, all RegExp completions, including RegExp specific members, show as deprecated. This is somewhat related to:

• Deprecated libraries and completion #61214

FYI @srawlins @lrhn @bwilkerson @mraleph

[FMorschel]

Testing on IJ, I get:

So only the RegExp class and similar get marked, but not the defined members.

[srawlins]

Ha! I saw this myself yesterday and was going to report it this morning. 😁 Thanks!

If this is in DAS, I bet it's a small fix, and might be worth cherry-picking. There was also a lively thread of confused users on Reddit.

[FMorschel]

I'd mentioned in the linked issues above some time ago, but I forgot about it and didn't ping you guys again.

[srawlins]

Grepping around pkg/analysis_server/lib, I'm seeing a few cases of hasDeprecated and isDeprecated that should probably by isDeprecatedWithKind('use'). I thought there was a isUseDeprecated or something helper, but I'm not seeing it. I can work on this today.

[FMorschel]

Do we want to CP this @srawlins ?

[srawlins]

I do

[jozzzzep]

I just upgraded again the flutter version, but I still get these warnings everywhere, is there any way to get this fix on the stable channel? @srawlins

'RegExp' is deprecated and shouldn't be used. This class will become 'final' in a future release. 'Pattern' may be a more appropriate interface to implement.
Try replacing the use of the deprecated member with the replacement.dart[deprecated_member_use](https://dart.dev/diagnostics/deprecated_member_use)

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