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What do you need line numbers for?

I use the "jump to line" command when I'm looking up the cause of a compiler error message, but in an IDE world I doubt I'd need even that, since it'd presumably just link the errors to the appropriate lines visually.

I think line numbers help in gauging how large a class or method is if the file is longer than a few hundred lines. They also help organize things for me, if I roughly know what line a certain piece of code exists at I can usually find it faster (using jump to line) than without having line numbers.

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