An anvil will not break through a redstone torch, or regular torch when placed directly above it. When placed on a torch, the torch disappears, and when placed two blocks above it, it goes through the torch, not breaking it.
Further Proof: http://www.youtube.com/watch?v=CEja2kAAt98&feature=youtu.be
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Duplicate of MC-838.
Originally placed in Survival, I was helping my friend rebuild, and decided to report this real quick. Also, will add the link for the other anvil falling through the torch, and deleting it in just a minute.