You're basically describing Swift:

    public func read(path: URL) throws -> Array<UInt8> {
        let file = try FileHandle(forReadingFrom: path)
        let bytes = try file.readToEnd() ?? Data()
        return Array(bytes)
    }

Yes, the example above is not generic and not even idiomatic Swift, but it's a good glimpse into how Rust could look like.

Hopefully someday Swift would become more safe, less tied to ObjC legacy and actually cross-platform. It's a shame that such a nice language is basically Apple-only.