Remove potentially lossy cast

2 files changed, 10 insertions, 8 deletions

diff --git a/examples/11-transient-0/output/rust/src/gen/data/transient_0.rs b/examples/11-transient-0/output/rust/src/gen/data/transient_0.rs
index 7f82820..1a6a009 100644
--- a/examples/11-transient-0/output/rust/src/gen/data/transient_0.rs
+++ b/examples/11-transient-0/output/rust/src/gen/data/transient_0.rs
@@ -253,7 +253,7 @@ pub fn decode_struct_with_list_of_shared(reader: &mut impl std::io::Read, shared
             elements.push({
                 let id = crate::transient_0::decode_int_64(reader, shared_values)?;
                 if id < ((shared_values.len()).try_into()).map_err(|error| ::std::io::Error::new(::std::io::ErrorKind::InvalidData, error))? {
-                    ((::std::sync::Arc::clone(&shared_values[id as ::core::primitive::usize])).downcast()).map_err(|error| ::std::io::Error::new(::std::io::ErrorKind::InvalidData, "referenced value has wrong type"))?
+                    ((::std::sync::Arc::clone(&shared_values[(::core::primitive::usize::try_from(id)).map_err(|error| ::std::io::Error::new(::std::io::ErrorKind::InvalidData, error))?])).downcast()).map_err(|error| ::std::io::Error::new(::std::io::ErrorKind::InvalidData, "referenced value has wrong type"))?
                 } else {
                     let decoded_value = ::std::sync::Arc::new(crate::data::transient_0::decode_struct_with_int_32(reader, shared_values)?);
                     shared_values.push(::std::sync::Arc::clone(&decoded_value) as ::std::sync::Arc::<dyn ::std::any::Any + ::std::marker::Sync + ::std::marker::Send>);
@@ -316,7 +316,7 @@ pub fn decode_struct_with_different_shared_types(reader: &mut impl std::io::Read
     let a = {
         let id = crate::transient_0::decode_int_64(reader, shared_values)?;
         if id < ((shared_values.len()).try_into()).map_err(|error| ::std::io::Error::new(::std::io::ErrorKind::InvalidData, error))? {
-            ((::std::sync::Arc::clone(&shared_values[id as ::core::primitive::usize])).downcast()).map_err(|error| ::std::io::Error::new(::std::io::ErrorKind::InvalidData, "referenced value has wrong type"))?
+            ((::std::sync::Arc::clone(&shared_values[(::core::primitive::usize::try_from(id)).map_err(|error| ::std::io::Error::new(::std::io::ErrorKind::InvalidData, error))?])).downcast()).map_err(|error| ::std::io::Error::new(::std::io::ErrorKind::InvalidData, "referenced value has wrong type"))?
         } else {
             let decoded_value = ::std::sync::Arc::new(crate::data::transient_0::decode_struct_with_int_32(reader, shared_values)?);
             shared_values.push(::std::sync::Arc::clone(&decoded_value) as ::std::sync::Arc::<dyn ::std::any::Any + ::std::marker::Sync + ::std::marker::Send>);
@@ -326,7 +326,7 @@ pub fn decode_struct_with_different_shared_types(reader: &mut impl std::io::Read
     let b = {
         let id = crate::transient_0::decode_int_64(reader, shared_values)?;
         if id < ((shared_values.len()).try_into()).map_err(|error| ::std::io::Error::new(::std::io::ErrorKind::InvalidData, error))? {
-            ((::std::sync::Arc::clone(&shared_values[id as ::core::primitive::usize])).downcast()).map_err(|error| ::std::io::Error::new(::std::io::ErrorKind::InvalidData, "referenced value has wrong type"))?
+            ((::std::sync::Arc::clone(&shared_values[(::core::primitive::usize::try_from(id)).map_err(|error| ::std::io::Error::new(::std::io::ErrorKind::InvalidData, error))?])).downcast()).map_err(|error| ::std::io::Error::new(::std::io::ErrorKind::InvalidData, "referenced value has wrong type"))?
         } else {
             let decoded_value = ::std::sync::Arc::new(crate::data::transient_0::decode_struct_with_int_64(reader, shared_values)?);
             shared_values.push(::std::sync::Arc::clone(&decoded_value) as ::std::sync::Arc::<dyn ::std::any::Any + ::std::marker::Sync + ::std::marker::Send>);
@@ -336,7 +336,7 @@ pub fn decode_struct_with_different_shared_types(reader: &mut impl std::io::Read
     let c = {
         let id = crate::transient_0::decode_int_64(reader, shared_values)?;
         if id < ((shared_values.len()).try_into()).map_err(|error| ::std::io::Error::new(::std::io::ErrorKind::InvalidData, error))? {
-            ((::std::sync::Arc::clone(&shared_values[id as ::core::primitive::usize])).downcast()).map_err(|error| ::std::io::Error::new(::std::io::ErrorKind::InvalidData, "referenced value has wrong type"))?
+            ((::std::sync::Arc::clone(&shared_values[(::core::primitive::usize::try_from(id)).map_err(|error| ::std::io::Error::new(::std::io::ErrorKind::InvalidData, error))?])).downcast()).map_err(|error| ::std::io::Error::new(::std::io::ErrorKind::InvalidData, "referenced value has wrong type"))?
         } else {
             let decoded_value = ::std::sync::Arc::new(crate::data::transient_0::decode_struct_with_int_32(reader, shared_values)?);
             shared_values.push(::std::sync::Arc::clone(&decoded_value) as ::std::sync::Arc::<dyn ::std::any::Any + ::std::marker::Sync + ::std::marker::Send>);
@@ -382,7 +382,7 @@ pub fn decode_struct_with_shared_sum_and_variant(reader: &mut impl std::io::Read
     let a = {
         let id = crate::transient_0::decode_int_64(reader, shared_values)?;
         if id < ((shared_values.len()).try_into()).map_err(|error| ::std::io::Error::new(::std::io::ErrorKind::InvalidData, error))? {
-            ((::std::sync::Arc::clone(&shared_values[id as ::core::primitive::usize])).downcast()).map_err(|error| ::std::io::Error::new(::std::io::ErrorKind::InvalidData, "referenced value has wrong type"))?
+            ((::std::sync::Arc::clone(&shared_values[(::core::primitive::usize::try_from(id)).map_err(|error| ::std::io::Error::new(::std::io::ErrorKind::InvalidData, error))?])).downcast()).map_err(|error| ::std::io::Error::new(::std::io::ErrorKind::InvalidData, "referenced value has wrong type"))?
         } else {
             let decoded_value = ::std::sync::Arc::new(crate::data::transient_0::decode_sum_with_variants(reader, shared_values)?);
             shared_values.push(::std::sync::Arc::clone(&decoded_value) as ::std::sync::Arc::<dyn ::std::any::Any + ::std::marker::Sync + ::std::marker::Send>);
@@ -392,7 +392,7 @@ pub fn decode_struct_with_shared_sum_and_variant(reader: &mut impl std::io::Read
     let b = {
         let id = crate::transient_0::decode_int_64(reader, shared_values)?;
         if id < ((shared_values.len()).try_into()).map_err(|error| ::std::io::Error::new(::std::io::ErrorKind::InvalidData, error))? {
-            ((::std::sync::Arc::clone(&shared_values[id as ::core::primitive::usize])).downcast()).map_err(|error| ::std::io::Error::new(::std::io::ErrorKind::InvalidData, "referenced value has wrong type"))?
+            ((::std::sync::Arc::clone(&shared_values[(::core::primitive::usize::try_from(id)).map_err(|error| ::std::io::Error::new(::std::io::ErrorKind::InvalidData, error))?])).downcast()).map_err(|error| ::std::io::Error::new(::std::io::ErrorKind::InvalidData, "referenced value has wrong type"))?
         } else {
             let decoded_value = ::std::sync::Arc::new(crate::data::transient_0::decode_variant_one(reader, shared_values)?);
             shared_values.push(::std::sync::Arc::clone(&decoded_value) as ::std::sync::Arc::<dyn ::std::any::Any + ::std::marker::Sync + ::std::marker::Send>);
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/rusttransient0/RustTransient0Generator.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/rusttransient0/RustTransient0Generator.java
index 3718f05..734e7f7 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/rusttransient0/RustTransient0Generator.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/rusttransient0/RustTransient0Generator.java
@@ -905,8 +905,10 @@ public class RustTransient0Generator implements Generator {
                                     List.of(
                                         new RustPrefixExpression(RustPrefixOperator.BORROW, new RustIndexExpression(
                                             RustPath.of(SHARED_VALUES_NAME),
-                                            // TODO: use try_into()
-                                            new RustTypeCastExpression(RustPath.of(id), RustTypes.USIZE)
+                                            new RustTryPropagationExpression(mapErrToInvalidData(new RustCallExpression(
+                                                RustTypes.USIZE.addSegment(RustPathSegment.of("try_from")),
+                                                List.of(RustPath.of(id))
+                                            )))
                                         ))
                                     )
                                 ),