Disparity in error message in GHCi with : load vs writing directly in GHCi
module Maintest where
a:: Int
a = 'a'
main = print "b"
If I load this program with the command :load
its answer is\\
Prelude> :l maintest
[1 of 1] Compiling Maintest ( maintest.hs, interpreted )
maintest.hs:4:5: error:
* Couldn't match expected type `Int' with actual type `Char'
* In the expression: 'a'
In an equation for `a': a = 'a'
|
4 | a = 'a'
| ^^^
Failed, modules loaded: none.
Prelude>
If I write this program directly in GHCi, its answer is\\
Prelude> :{
Prelude| module Maintest where
Prelude| a:: Int
Prelude| a = 'a'
Prelude| main = print "b"
Prelude| :}
<interactive>:20:5: error:
* Couldn't match expected type `Int' with actual type `Char'
* In the expression: 'a'
In an equation for `a': a = 'a'
Prelude>
This information has disappeared\\
|
4 | a = 'a'
| ^^^
The version of GHCi used is this one GHCi, version 8.2.0.20170507
Trac metadata
Trac field | Value |
---|---|
Version | |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | GHCi |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |