[PATCH 05/10] rust: pin-init: internal: add missing where clause to projection types

[Gary Guo <gary@garyguo.net>]

From: Mohamad Alsadhan <mo@sdhn.cc>

`#[pin_data]` failed to propagate the struct's `where` clause to the
generated projection struct. As a result, bounds written in a `where`
clause could be dropped during expansion, causing type errors when
fields depended on those bounds.

Fix this by adding the missing `where` clause to the generated
projection struct.

Reported-by: Andreas Hindborg <a.hindborg@kernel.org>
Closes: https://rust-for-linux.zulipchat.com/#narrow/channel/561532-pin-init/topic/generic.20bounds.20and.20.60.23.5Bpin_data.5D.60/with/578381591
Signed-off-by: Mohamad Alsadhan <mo@sdhn.cc>
Reviewed-by: Gary Guo <gary@garyguo.net>
[ Reworded commit message - Gary ]
Signed-off-by: Gary Guo <gary@garyguo.net>
---
 rust/pin-init/internal/src/pin_data.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/rust/pin-init/internal/src/pin_data.rs b/rust/pin-init/internal/src/pin_data.rs
index 7d871236b49c..6b1b8f26379a 100644
--- a/rust/pin-init/internal/src/pin_data.rs
+++ b/rust/pin-init/internal/src/pin_data.rs
@@ -304,7 +304,9 @@ fn generate_projections(
         #[doc = #docs]
         #[allow(dead_code)]
         #[doc(hidden)]
-        #vis struct #projection #generics_with_pin_lt {
+        #vis struct #projection #generics_with_pin_lt
+            #whr
+        {
             #(#fields_decl)*
             ___pin_phantom_data: ::core::marker::PhantomData<&'__pin mut ()>,
         }

-- 
2.51.2