Ambiguous interface errors in GHCi, even with -XPackageImports
Originally reported in https://github.com/haskell/cabal/issues/4253, but I moved it here after being reassured that this was a GHCi bug, not a Cabal
one.
To reproduce this issue, you'll need to install two libraries that export two constructors with the same name. The original issue uses GLFW
and GLFW-b
as examples, but for the puposes of test case minimalization, I've prepared a repo here (https://github.com/RyanGlScott/cabal-gh4253) with as small of an example as I can manage. To reproduce the issue, do the following:
$ git clone https://github.com/RyanGlScott/cabal-gh4253
$ cd cabal-gh4253/
$ cabal install package1/ package2/
$ ghci -XPackageImports
GHCi, version 8.0.2: http://www.haskell.org/ghc/ :? for help
Loaded GHCi configuration from /home/rgscott/.ghci
λ> import "package1" DuplicateModuleName
λ> Window
<interactive>:1:1: error:
Ambiguous interface for ‘DuplicateModuleName’:
it was found in multiple packages:
package1-0.1.0.0 package2-0.1.0.0
This seems to be specific to GHCi, because I cannot find a way to trigger the same issue with ghc --make
.
I've reproduced this with GHC 8.0.2 and HEAD.
Trac metadata
Trac field | Value |
---|---|
Version | 8.0.2 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | GHCi |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | ezyang |
Operating system | |
Architecture |