chore(ci): Update Rust CI to use tip of Dafny's feat-rust branch (#472)

Updates the Rust CI to use the tip of Dafny's `feat-rust` branch. To make this work:

* Reverts all patches to `implementation_from_dafny.rs` as the latest commit fixes all the bugs we were working around.
  * Also removes those files from git and ignores them from hence forth!
  * Also tweaks polymorph to not delete this file from StandardLibrary (which is why the patch file was creating it from scratch)
* Updates the snapshot of `dafny_runtime_rust` to match.
* Replaces various uses of `dafny_runtime_rust::UpcastTo` with `dafny_runtime_rust::upcast_object()(...)`
  * Also implements `UpcastObject` for some of our types as neeeded.
* Updates all patch files (using a local edit to the `RustTestModels` test runner!)

Author: robin-aws

.github/workflows/pull.yml

@@ -49,7 +49,7 @@ jobs:
         # Rust code generation is under development and depends on pending changes to the
         # Dafny Rust code generation, so we test on a specific commit from the feat-rust feature branch instead.
         dafny-version:
-          - ebe9aa5592bea6c0a7ed3fc204db2fb8addf0661
+          - f82ce12a800efddb22c987be0adb559752c7b6b9
     uses: ./.github/workflows/test_models_rust_tests.yml
     with:
       dafny: ${{ matrix.dafny-version }}

.github/workflows/push.yml

@@ -51,7 +51,7 @@ jobs:
         # Rust code generation is under development and depends on pending changes to the
         # Dafny Rust code generation, so we test on a specific commit from the feat-rust feature branch instead.
         dafny-version:
-          - ebe9aa5592bea6c0a7ed3fc204db2fb8addf0661
+          - f82ce12a800efddb22c987be0adb559752c7b6b9
     uses: ./.github/workflows/test_models_rust_tests.yml
     with:
       dafny: ${{ matrix.dafny-version }}

TestModels/.gitignore

@@ -12,6 +12,7 @@
 # Dafny Generated Rust
 # (Rust code generation is incomplete so we're patching and checking in for now)
 #**/runtimes/rust
+**/implementation_from_dafny.rs
 # Cargo.lock files should only be committed for binaries, not libraries
 **/Cargo.lock
 

TestModels/Aggregate/codegen-patches/rust/dafny-4.5.0.patch

@@ -1,6 +1,6 @@
 diff --git b/TestModels/Aggregate/runtimes/rust/src/client.rs a/TestModels/Aggregate/runtimes/rust/src/client.rs
 new file mode 100644
-index 00000000..d5fef505
+index 00000000..96a89e4d
 --- /dev/null
 +++ a/TestModels/Aggregate/runtimes/rust/src/client.rs
 @@ -0,0 +1,43 @@
@@ -39,7 +39,7 @@ index 00000000..d5fef505
 +            ));
 +        }
 +        Ok(Self {
-+            dafny_client: ::dafny_runtime::UpcastTo::<dafny_runtime::Object<(dyn ::simple_aggregate_dafny::r#_simple_daggregate_dinternaldafny_dtypes::ISimpleAggregateClient + 'static)>>::upcast_to(inner.Extract()),
++            dafny_client: ::dafny_runtime::upcast_object()(inner.Extract()),
 +        })
 +    }
 +}
@@ -109,7 +109,7 @@ index 00000000..b5acb2be
 +pub mod structure_list_element;
 diff --git b/TestModels/Aggregate/runtimes/rust/src/conversions/get_aggregate.rs a/TestModels/Aggregate/runtimes/rust/src/conversions/get_aggregate.rs
 new file mode 100644
-index 00000000..1918663b
+index 00000000..8db680b5
 --- /dev/null
 +++ a/TestModels/Aggregate/runtimes/rust/src/conversions/get_aggregate.rs
 @@ -0,0 +1,32 @@
@@ -123,7 +123,7 @@ index 00000000..1918663b
 +) -> ::std::rc::Rc<::simple_aggregate_dafny::r#_simple_daggregate_dinternaldafny_dtypes::Error> {
 +    match value {
 +    crate::operation::get_aggregate::GetAggregateError::Unhandled(unhandled) =>
-+      ::std::rc::Rc::new(::simple_aggregate_dafny::r#_simple_daggregate_dinternaldafny_dtypes::Error::Opaque { obj: ::dafny_runtime::UpcastTo::<::dafny_runtime::Object<dyn Any>>::upcast_to(::dafny_runtime::object::new(unhandled)) })
++      ::std::rc::Rc::new(::simple_aggregate_dafny::r#_simple_daggregate_dinternaldafny_dtypes::Error::Opaque { obj: ::dafny_runtime::upcast_object()(::dafny_runtime::object::new(unhandled)) })
 +  }
 +}
 +
@@ -401,7 +401,7 @@ index 00000000..0a0bee21
 +}
 diff --git b/TestModels/Aggregate/runtimes/rust/src/conversions/get_aggregate_known_value_test.rs a/TestModels/Aggregate/runtimes/rust/src/conversions/get_aggregate_known_value_test.rs
 new file mode 100644
-index 00000000..e013077c
+index 00000000..a128f451
 --- /dev/null
 +++ a/TestModels/Aggregate/runtimes/rust/src/conversions/get_aggregate_known_value_test.rs
 @@ -0,0 +1,39 @@
@@ -418,7 +418,7 @@ index 00000000..e013077c
 +            unhandled,
 +        ) => ::std::rc::Rc::new(
 +            ::simple_aggregate_dafny::r#_simple_daggregate_dinternaldafny_dtypes::Error::Opaque {
-+                obj: ::dafny_runtime::UpcastTo::<::dafny_runtime::Object<dyn Any>>::upcast_to(
++                obj: ::dafny_runtime::upcast_object()(
 +                    ::dafny_runtime::object::new(unhandled),
 +                ),
 +            },
@@ -1007,10 +1007,10 @@ index 00000000..ec89cbec
 +pub(crate) mod sealed_unhandled;
 diff --git b/TestModels/Aggregate/runtimes/rust/src/error/sealed_unhandled.rs a/TestModels/Aggregate/runtimes/rust/src/error/sealed_unhandled.rs
 new file mode 100644
-index 00000000..9d21fbd6
+index 00000000..cce22d1c
 --- /dev/null
 +++ a/TestModels/Aggregate/runtimes/rust/src/error/sealed_unhandled.rs
-@@ -0,0 +1,22 @@
+@@ -0,0 +1,26 @@
 +// Code generated by software.amazon.smithy.rust.codegen.smithy-rs. DO NOT EDIT.
 +/// This struct is not intended to be used.
 +///
@@ -1033,6 +1033,10 @@ index 00000000..9d21fbd6
 +    pub(crate) source: ::aws_smithy_runtime_api::box_error::BoxError,
 +    pub(crate) meta: ::aws_smithy_types::error::metadata::ErrorMetadata,
 +}
++
++impl ::dafny_runtime::UpcastObject<dyn ::std::any::Any> for Unhandled {
++    ::dafny_runtime::UpcastObjectFn!(dyn ::std::any::Any);
++}
 diff --git b/TestModels/Aggregate/runtimes/rust/src/lib.rs a/TestModels/Aggregate/runtimes/rust/src/lib.rs
 new file mode 100644
 index 00000000..89dacaff