Missing note for duplicate global actor annotations

[rauhul]

Description

There should be a note indicating where the other annotations are in source.

Reproduction

@MainActor // func uhoh-commented-out() {
//   print("oops")
// }
@MainActor func myFunction() {}

➜  Desktop (main 6/9/25) swiftc -c test.swift
test.swift:4:17: error: declaration can not have multiple global actor attributes ('MainActor' and 'MainActor')
2 | //   print("oops")
3 | // }
4 | @MainActor func myFunction() {}
  |                 `- error: declaration can not have multiple global actor attributes ('MainActor' and 'MainActor')
5 |
6 |

Expected behavior

a note referring to source location 1:1.

Environment

$ swiftc --version
Apple Swift version 6.2-dev (LLVM 3c4a54b02dd62b7, Swift a40a7be6945a895)
Target: arm64-apple-macosx16.0
Build config: +assertions

Additional information

No response