ghci should complain when the user imports non-existent modules
I was surprised today when I tried to import a module that wasn't installed locally and ghci didn't issue a warning so I assume it loaded. I didn't even notice that the prompt didn't change. I tried to use functions in the module I thought was imported and that's how I learned it didn't actually succeed at the import.
Here is an example to reproduce what I saw:
$ ghci
GHCi, version 7.4.1: http://www.haskell.org/ghc/ :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Prelude> import Control.Monad.Pizza
Prelude> Thanks!
Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.4.1 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | GHCi |
| Test case | |
| Differential revisions | |
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| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |