import parser loses override local keys

[idoros]

When importing both x and x as y, the named results are kept in a map from import-name to local names, overriding each other:

import [x, x as y] from 'file'; -> { named: { x: 'y' } }

import [x as y, x] from 'file'; -> { named: { x: 'x' } }

Map should have unique keys from local to import names

while both should output: { named: { x: 'x', y: 'x' } }