Poor diagnostic for misspelled enum case name in catch clause

[jrose-signal]

Description

No response

Reproduction

enum MyError {
    case firstError(String)
    case secondError(Int)
}

func test() throws {}

func client() throws {
    do {
        try test()
    } catch MyError.notFirstError(_) {
        // Expected
    }
}

<source>:11:35: error: '_' can only appear in a pattern or on the left side of an assignment
 9 │     do {
10 │         try test()
11 │     } catch MyError.notFirstError(_) {
   │                                   ╰─ error: '_' can only appear in a pattern or on the left side of an assignment
12 │         // Expected
13 │     }

Expected behavior

type 'MyError' has no member 'notFirstError', which is what you get if you drop the (_).

Environment

Swift version 6.0-dev (LLVM 4d3f797c4fe4835, Swift 784a7c5)
(via swift.godbolt.org)

Additional information

Also occurs in switch cases, unsurprisingly. catch clauses are just where I ran into it.

Extra search tags: underscore, payload

[AnthonyLatsis]

Smaller test case:

enum E {
    case firstError(String)
}

func test(e: E) {
  if case E.notFirstError(_) = e {}
}