Quoth Brandon S Allbery KF8NH
They line up fine in a fixed width font. Programming in any indentation-sensitive language in a proportional font leads inevitably to use of tabs to make things line up properly, which leads directly to pain.
I haven't noticed urgent problems with indentation, per se. I'm not programming in proportional fonts, but of course when I look at this stuff here it's email, not a programming editor, and the fonts are proportional. Maybe I'm lucky with the fonts on my platform, but the indentation is fine. All I expect is that indentation levels compare correctly to themselves: i.e., any two lines indented to the same level are indented the same distance and indented to different levels they are indented an appropriately lesser or greater distance. (That's slightly less rigorous than Haskell's layout requires, though, isn't it? I'm not sure. If it does, anyway my personal coding style is not to depend on alignment for structure, but only relative indentation.) The present problem involves alignments that are superfluous to Haskell's indentation requirement. Vertical alignment past the indentation does indeed dictate use of fixed width fonts, for editor and all display media. Not nearly worth it in my opinion, but obviously some would disagree. Donn