Google announced they're shutting down Code Search.
I found Google Code Search to be invaluable in the kind of work I do. I saved tons of time by being able to find existing code for something tricky already invented. Or I could compare multiple implementations for things to learn about what different techniques there are for various operations and learn immensely from their pros and cons. If you're reimplementing something yourself, it's also nice to be easily able to find tests cases and other things with Google Code Search.
Now all that is going away. Are there any feasible alternatives? Do we need to start a competing search engine? What are programmers to do when Google cuts the number one online tool for researching code?