[cfe-dev] UsingDecl vs UsingShadowDecl

[Kim Gräsman via cfe-dev]

Hi all,

I'm having trouble understanding what the respective Decls represent.

When would there be more than one UsingShadowDecl for a UsingDecl?
When would there be none? Why is the target decl only reachable from
the shadows?

I'm about to fix a bug in IWYU where we have a UsingDecl without any
shadows, but I wanted to make sure I understand the concepts before
committing to anything.

Thanks,
- Kim