Re: Question about Haskell lexer and parser.

Hi,

This rule only applies if there is a parse error on the next token (t). [...] It does mean that layout processing can't be done entirely in the lexer,

Take a look at some of the existing Haskell parsers to see how it can be done: [...]

Don't look at Helium. We have a simplified layout rule which can be resolved in the lexer entirely. You *have to* indent less to close a layout context. Of course, it doesn't accept complicated usage of the layout rule (e.g. [ case 3 of 3 -> 4, 5]) but the parse errors can be clearer and this kind of usage is very rare, especially if you don't tell students about the funny rule above. Greetings, Arjan