20 May
2011
20 May
'11
8:02 a.m.
On Friday 20 May 2011 06:08:30, Antoine Latter wrote:
A key point about instance resolution - when GHC tries to find an instance to useit only looks at what is on the left-hand side of the
Antoine meant right-hand side here, of course.
(=>) mark.
So an instance of the form:
instance (Constraint a) => MyClass [a] where ...
can be read aloud as:
"[a] is an instance of MyClass. Also, it is an error if Constraint a is not satisfied".