Assertion failed: Index < Length && "Invalid index!"

[rayx]

Description

I find the following code crashed compiler. The culprit seems to be @isolated(any) and some function in the body (not sure which one it's).

extension GlobalActor {
    static func assumeIsolated<T: Sendable>(_ operation: @isolated(any) () throws -> T) rethrows -> T {
        return try withoutActuallyEscaping(operation) { escapingClosure in
            try unsafeBitCast(escapingClosure, to: (() throws -> T).self)()
        }
    }
}

Reproduction

See above

Stack dump

See https://godbolt.org/z/ddKrqaaYE

Expected behavior

Compiler shouldn't crash.

Environment

swiftc nightly on godbolt

Additional information

No response

[jamieQ]

i suspect this is a duplicate of #79947