Merge taiki-e#113

113: Fix support for DSTs r=taiki-e a=taiki-e

Fixes taiki-e#112

Co-authored-by: Taiki Endo <te316e89@gmail.com>

Author: bors[bot]

examples/pinned_drop-expanded.rs

@@ -130,7 +130,7 @@ fn __unpin_scope_Foo() {
 #[allow(single_use_lifetimes)]
 #[allow(non_snake_case)]
 #[deny(safe_packed_borrows)]
-fn __pin_project_assert_not_repr_packed_Foo<'a, T>(val: Foo<'a, T>) {
+fn __pin_project_assert_not_repr_packed_Foo<'a, T>(val: &Foo<'a, T>) {
     {
         &val.was_dropped;
     }

examples/struct-default-expanded.rs

@@ -130,7 +130,7 @@ impl<T, U> StructMustNotImplDrop for Struct<T, U> {}
 #[allow(single_use_lifetimes)]
 #[allow(non_snake_case)]
 #[deny(safe_packed_borrows)]
-fn __pin_project_assert_not_repr_packed_Struct<T, U>(val: Struct<T, U>) {
+fn __pin_project_assert_not_repr_packed_Struct<T, U>(val: &Struct<T, U>) {
     {
         &val.pinned;
     }

examples/unsafe_unpin-expanded.rs

@@ -85,7 +85,7 @@ impl<T, U> FooMustNotImplDrop for Foo<T, U> {}
 #[allow(single_use_lifetimes)]
 #[allow(non_snake_case)]
 #[deny(safe_packed_borrows)]
-fn __pin_project_assert_not_repr_packed_Foo<T, U>(val: Foo<T, U>) {
+fn __pin_project_assert_not_repr_packed_Foo<T, U>(val: &Foo<T, U>) {
     {
         &val.pinned;
     }

pin-project-internal/src/pin_project/attribute.rs

@@ -322,7 +322,7 @@ fn ensure_not_packed(item: &ItemStruct) -> Result<TokenStream> {
     // struct, we generate code like this:
     //
     // #[deny(safe_packed_borrows)]
-    // fn enforce_not_packed_for_MyStruct(val: MyStruct) {
+    // fn enforce_not_packed_for_MyStruct(val: &MyStruct) {
     //  let _field1 = &val.field1;
     //  let _field2 = &val.field2;
     //  ...
@@ -381,7 +381,7 @@ fn ensure_not_packed(item: &ItemStruct) -> Result<TokenStream> {
         #[allow(single_use_lifetimes)]
         #[allow(non_snake_case)]
         #[deny(safe_packed_borrows)]
-        fn #method_name #impl_generics (val: #struct_name #ty_generics) #where_clause {
+        fn #method_name #impl_generics (val: &#struct_name #ty_generics) #where_clause {
             #(#field_refs)*
         }
     };

tests/pin_project.rs

@@ -357,3 +357,23 @@ fn trivial_bounds() {
         field: PhantomPinned,
     }
 }
+
+#[test]
+fn dst() {
+    #[pin_project]
+    pub struct A<T: ?Sized> {
+        x: T,
+    }
+
+    #[pin_project]
+    pub struct B<T: ?Sized> {
+        #[pin]
+        x: T,
+    }
+
+    #[pin_project]
+    pub struct C<T: ?Sized>(T);
+
+    #[pin_project]
+    pub struct D<T: ?Sized>(#[pin] T);
+}

tests/ui/pin_project/packed_sneaky-2.rs

@@ -6,7 +6,7 @@ extern crate sneaky_macro;
 
 use pin_project::pin_project;
 
-hidden_repr_macro! { //~ ERROR borrow of packed field is unsafe and requires unsafe function or block
+hidden_repr_macro! { //~ ERROR may not be used on #[repr(packed)] types
     #[pin_project]
     struct B {
         #[pin]

tests/ui/pin_project/packed_sneaky-2.stderr

@@ -1,7 +1,7 @@
 error: #[pin_project] attribute may not be used on #[repr(packed)] types
   --> $DIR/packed_sneaky-2.rs:9:1
    |
-9  | / hidden_repr_macro! { //~ ERROR borrow of packed field is unsafe and requires unsafe function or block
+9  | / hidden_repr_macro! { //~ ERROR may not be used on #[repr(packed)] types
 10 | |     #[pin_project]
 11 | |     struct B {
 12 | |         #[pin]