Allow `.` in `import` alias

[lue-bird]

Unlike module names, import aliases can't contain ..

import Tree.Path
import Tree.Path.Extra as Tree.Path

UNFINISHED IMPORT - I am partway through parsing an import, but I got stuck here:

import Tree.Path.Extra as Tree.Path
                             #^#

Here are some examples of valid import declarations: [..]

You are probably trying to import a different module, but try to make it look like one of these examples! [..]

This makes patterns like the above X.Y.Extra as X.Y a bit uglier (less aligned), less clear and more ambiguous:

import Tree.Path
import Tree.Path.Extra as TreePath

toNeighbour index =
    \treePath ->
        treePath
            |> TreePath.toParent
            |> Tree.Path.toChild index

• elm 0.19.1

[github-actions[bot]]

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