rustc: async fn drop order lowering in HIR

This commit re-implements the async fn drop order lowering changes so
that it all takes place in HIR lowering, building atop the work done by
`@eddyb` to refactor `Res::Upvar`.

Previously, this types involved in the lowering were constructed in
libsyntax as they had to be used during name resolution and HIR
lowering. This was awful because none of that logic should have existed
in libsyntax.

This commit also changes `ArgSource` to keep a `HirId` to the original
argument pattern rather than a cloned copy of the pattern.

0 files changed, 0 insertions, 0 deletions