There's nothing like setting up emerge with 60 packages to update, leaving for a while, and coming back to see that it died on the second one.
It would be nice if it kept the compile output in a tmp file (such as sandbox errors) and continued on it's way until emerge hits the end of the list or can't procede because of the previous failure being a dependency of what is left. An emerge summary at the end could tell you what failed and where to check out the information.
*** This bug has been marked as a duplicate of 12768 ***