blob: 5618d844718e14755893f537b00c35e210c09eae (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
|
tcfail121.hs:13:9: error: [GHC-43085]
• Overlapping instances for Foo [a] arising from a use of ‘op’
Matching instance:
instance [overlappable] Foo a => Foo [a]
-- Defined at tcfail121.hs:9:31
Potentially matching instance:
instance [overlapping] Foo [Int] -- Defined at tcfail121.hs:10:30
(The choice depends on the instantiation of ‘a’
To pick the first instance above, use IncoherentInstances
when compiling the other instance declarations)
• In the expression: op x
In an equation for ‘foo’: foo x = op x
|
