Malcolm.Wallace at cs.york.ac.uk
Mon Feb 19 07:10:29 EST 2007
Ross Paterson <ross at soi.city.ac.uk> wrote:
> The semicolon before the "else" is the most useful. Adding another
> before the "then" has less motivation.
do if foo
seems just as likely to occur as
do if foo then bar
particularly if the condition "foo" is large, and/or indentation is
already running a long distance to the right.
> > However, I have never come across the case-of expression variation
> > in practice. Indeed, the wiki page is not very clear on what
> > exactly the problem is.
> The argument regarding "case" is that if you add a semicolon before
> "then", it would be consistent to also add one before "of".
If the only argument is consistency, then surely the same applies to the
"in" in a let expression. But of course this would correct a problem
that never occurs in practice, because in a do-block one uses plain let,
not let-in. So what evidence is there that case-of is a problem in
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