[New Output] Improve Multiline Compiler Warning Output

[cpisciotta]

What's the uncaptured output?

/path/to/file.swift:20:10: warning: capture of 'transaction' with non-sendable type 'Transaction' in a `@Sendable` closure
              withTransaction(transaction) {
                              ^
SwiftUI.Transaction:2:23: note: struct 'Transaction' does not conform to the 'Sendable' protocol
@frozen public struct Transaction {
                      ^

Suggested Regex

No response

Suggested Output

No response

Additional Context

No response

[github-actions]

Hola 👋,

We want to inform you that the issue has been marked as stale. This means that there hasn't been any activity or updates on it for quite some time, and it's possible that it may no longer be relevant or actionable.
If you still believe that this issue is valid and requires attention, please provide an update or any additional information that can help us address it. Otherwise, we may consider closing it in the near future.
Thank you for your understanding.

[mattmassicotte]

I just noticed a problem with output from GitHub Actions, and it's possible this is the same issue. Here's the relevant outputs which is missing some critical context. I cannot tell what where this error is coming from.

Error: 'assumeIsolated(_:file:line:)' is only available in macOS 14.0 or newer
                        MainActor.assumeIsolated {
                                  ^

Does this issue cover this problem?

[cpisciotta]

Hey @mattmassicotte. Thanks for filing this. This appears to be a similar issue. I'll take a look as soon as I can, and I'll post an update once I have one.