Storing interfaces with conflicting names--

ConflictNamesProposal.hs

{-
Possible actions to take with conflicting names:

1. 
Try to guess which one the user meant, by seeing if there's a name (or set of names) used
only found in one.
Give an error if this can't be determined.

2.
Add syntax for importing a package, something like
  import package johnpmayer elm-linear-algebra as Lin
  import Lin.Math.Vector4
Then, give an error on any conficts not resolved this way

3. Always give an error, rely on package maintainers to avoid conflicting names.
-}

--Regardless, the correct answer is not "use whatever order Elm-make sees them"
--so here's a proposed change to allow for a fix

--AST.Module
type Interfaces = Map.Map Name [Interface]

--Elm.Compiler:

compile
     :: Context
     -> String
     -> Map.Map PublicModule.Name [PublicModule.Interface]
     -> (Dealiaser, [Warning], Either [Error] Result)
     
--Reporting.Error.Canonicalize
 data ImportError
     = ModuleNotFound [Module.Name]
     | ValueNotFound String [String]
     | AmbiguousImport [Var.PackageInfo]
     
--The idea is similar in Elm-make for reading interfaces
--We keep them in a dict of lists, not a dict of interfaces