blob: 1e77e05318dace4c13a7d32a3b690c2dd66388be (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
|
T3323.hs:18:7: error:
• Could not deduce (GHC.IO.Device.RawIO dev0)
from the context: (GHC.IO.Device.RawIO dev,
GHC.IO.Device.IODevice dev, GHC.IO.BufferedIO.BufferedIO dev,
base-4.16.0.0:Data.Typeable.Internal.Typeable dev)
bound by a pattern with constructor:
Handle__ :: forall dev enc_state dec_state.
(GHC.IO.Device.RawIO dev, GHC.IO.Device.IODevice dev,
GHC.IO.BufferedIO.BufferedIO dev,
base-4.16.0.0:Data.Typeable.Internal.Typeable dev) =>
dev
-> HandleType
-> GHC.IORef.IORef (GHC.IO.Buffer.Buffer GHC.Word.Word8)
-> BufferMode
-> GHC.IORef.IORef (dec_state, GHC.IO.Buffer.Buffer GHC.Word.Word8)
-> GHC.IORef.IORef (GHC.IO.Buffer.Buffer GHC.IO.Buffer.CharBufElem)
-> GHC.IORef.IORef (BufferList GHC.IO.Buffer.CharBufElem)
-> Maybe (GHC.IO.Encoding.Types.TextEncoder enc_state)
-> Maybe (GHC.IO.Encoding.Types.TextDecoder dec_state)
-> Maybe GHC.IO.Encoding.Types.TextEncoding
-> Newline
-> Newline
-> Maybe (GHC.MVar.MVar Handle__)
-> Handle__,
in a case alternative
at T3323.hs:18:7-28
The type variable ‘dev0’ is ambiguous
• In a record update at field ‘haDevice’,
with type constructor ‘Handle__’,
data constructor ‘Handle__’
and existential variables ‘dev’, ‘enc_state’, ‘dec_state’.
In the expression: h {haDevice = undefined}
In an equation for ‘f’: f h = h {haDevice = undefined}
|
