Nonsense evaluation: sequence [] = []
$ ghci-7.6.2
GHCi, version 7.6.2: http://www.haskell.org/ghc/ :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
>>> sequence []
[]
>>> :t it
it :: [()]
>>> sequence [] :: [()]
<interactive>:4:1:
Couldn't match type `[a0]' with `()'
Expected type: [()]
Actual type: [[a0]]
In the return type of a call of `sequence'
In the expression: sequence [] :: [()]
In an equation for `it': it = sequence [] :: [()]
Wat. Where on earth did ghci get the idea that sequence [] = []
?
Trac metadata
Trac field | Value |
---|---|
Version | 7.6.2 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |