When a bzl file contains a load, e.g.
load("//some:file.bzl", "fct")
it implicitly exports fct.

This is problematic for many reasons:

• Exports should be explicit
• Other languages don't do that
• Removing a load can break other files
• So it means we can't have a tool to safely remove unused loads

Unfortunately, this is a breaking change.

There are two ways to fix it.

1. Update the load site and use the label of the file where the symbol is really declared
2. Update the loaded file. To explicitly re-export the symbol foo, use:

load("...", _foo = "foo")

foo = _foo