blob: 783331fdfc4feca7e183eca711e42bb7f4983235 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
|
tcfail121.hs:13:9:
Overlapping instances for Foo [a]
arising from a use of `op'
Matching instances:
instance [overlap ok] Foo a => Foo [a]
-- Defined at tcfail121.hs:9:10-25
instance [overlap ok] Foo [Int] -- Defined at tcfail121.hs:10:10-18
(The choice depends on the instantiation of `a'
To pick the first instance above, use -XIncoherentInstances
when compiling the other instance declarations)
In the expression: op x
In an equation for `foo': foo x = op x
|