3An alternative Ord instance for Nats, with an explicit name "myord"
6> instance [myord] Ord Nat where
11The @{name} syntax below gives an explicit dictionary for the compare function.
12Here, we're telling it to use the "myord" dictionary. Otherwise, it'd just
13use the default (unnamed) instance. Note that there can only be one unnamed
14instance --- they must not overlap.
16> compare (S x) (S y) = compare @{myord} x y
19> foo = [1,4,2,8,3,7,5,6]
21Sort foo using the default comparison operator:
26-- which gives [1,2,3,4,5,6,7,8]
28Sort foo using the alternative instance. No need for 'sortBy' and other
29such functions. Hoorah!
32> test2 = sort @{myord} foo
34-- which gives [8,7,6,5,4,3,2,1]
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