|3||3||Many newbies seems to get their Haskell code layout wrong because their editor uses tab stops that are not 8 spaces wide. The code looks to them exactly as if it were correctly aligned, but according to the Haskell Report it is not. A reasonable proposal would be to outlaw tab characters in source code altogether. Always use spaces for indentation. Most editors can automatically convert from tabs to spaces, and it is better to alert the newbie programmer with a lexical error "tab not permitted", than to leave it to either the parser, or worse, the type system, to complain about something incomprehensible later on.