Poor error message if type signature lacks definition
The file
nub :: a
Produces the error message in GHC:
Temp.hs:5:0: Not in scope: `nub'
The problem isn't that nub
is not in scope, but that there is no definition. Importing Data.List
(and bringing nub
into scope) doesn't solve the problem, but gives a new error message. Hugs does quite a bit better:
ERROR file:.\Temp.hs:5 - Missing binding for variable "nub" in type signature
Trac metadata
Trac field | Value |
---|---|
Version | 6.8.2 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | Unknown |
Architecture | Unknown |