Upgrade rust/crates/protobuf to 2.18.1

Test: make
Change-Id: I5b915568dd8c388d36820424b8c7986dfd33af3b
diff --git a/src/reflect/map.rs b/src/reflect/map.rs
index 9f03123..c6aff60 100644
--- a/src/reflect/map.rs
+++ b/src/reflect/map.rs
@@ -26,7 +26,7 @@
 }
 
 trait ReflectMapIterTrait<'a> {
-    fn next(&mut self) -> Option<(&'a ProtobufValue, &'a ProtobufValue)>;
+    fn next(&mut self) -> Option<(&'a dyn ProtobufValue, &'a dyn ProtobufValue)>;
 }
 
 struct ReflectMapIterImpl<'a, K: Eq + Hash + 'static, V: 'static> {
@@ -36,29 +36,29 @@
 impl<'a, K: ProtobufValue + Eq + Hash + 'static, V: ProtobufValue + 'static> ReflectMapIterTrait<'a>
     for ReflectMapIterImpl<'a, K, V>
 {
-    fn next(&mut self) -> Option<(&'a ProtobufValue, &'a ProtobufValue)> {
+    fn next(&mut self) -> Option<(&'a dyn ProtobufValue, &'a dyn ProtobufValue)> {
         match self.iter.next() {
-            Some((k, v)) => Some((k as &ProtobufValue, v as &ProtobufValue)),
+            Some((k, v)) => Some((k as &dyn ProtobufValue, v as &dyn ProtobufValue)),
             None => None,
         }
     }
 }
 
 pub struct ReflectMapIter<'a> {
-    imp: Box<ReflectMapIterTrait<'a> + 'a>,
+    imp: Box<dyn ReflectMapIterTrait<'a> + 'a>,
 }
 
 impl<'a> Iterator for ReflectMapIter<'a> {
-    type Item = (&'a ProtobufValue, &'a ProtobufValue);
+    type Item = (&'a dyn ProtobufValue, &'a dyn ProtobufValue);
 
-    fn next(&mut self) -> Option<(&'a ProtobufValue, &'a ProtobufValue)> {
+    fn next(&mut self) -> Option<(&'a dyn ProtobufValue, &'a dyn ProtobufValue)> {
         self.imp.next()
     }
 }
 
-impl<'a> IntoIterator for &'a ReflectMap {
+impl<'a> IntoIterator for &'a dyn ReflectMap {
     type IntoIter = ReflectMapIter<'a>;
-    type Item = (&'a ProtobufValue, &'a ProtobufValue);
+    type Item = (&'a dyn ProtobufValue, &'a dyn ProtobufValue);
 
     fn into_iter(self) -> Self::IntoIter {
         self.reflect_iter()
diff --git a/src/reflect/optional.rs b/src/reflect/optional.rs
index ba6cbaf..f81f973 100644
--- a/src/reflect/optional.rs
+++ b/src/reflect/optional.rs
@@ -5,17 +5,17 @@
 use crate::singular::*;
 
 pub trait ReflectOptional: 'static {
-    fn to_option(&self) -> Option<&ProtobufValue>;
+    fn to_option(&self) -> Option<&dyn ProtobufValue>;
 
-    fn set_value(&mut self, value: &ProtobufValue);
+    fn set_value(&mut self, value: &dyn ProtobufValue);
 }
 
 impl<V: ProtobufValue + Clone + 'static> ReflectOptional for Option<V> {
-    fn to_option(&self) -> Option<&ProtobufValue> {
-        self.as_ref().map(|v| v as &ProtobufValue)
+    fn to_option(&self) -> Option<&dyn ProtobufValue> {
+        self.as_ref().map(|v| v as &dyn ProtobufValue)
     }
 
-    fn set_value(&mut self, value: &ProtobufValue) {
+    fn set_value(&mut self, value: &dyn ProtobufValue) {
         match value.as_any().downcast_ref::<V>() {
             Some(v) => mem::replace(self, Some(v.clone())),
             None => panic!(),
@@ -24,11 +24,11 @@
 }
 
 impl<V: ProtobufValue + Clone + 'static> ReflectOptional for SingularField<V> {
-    fn to_option(&self) -> Option<&ProtobufValue> {
-        self.as_ref().map(|v| v as &ProtobufValue)
+    fn to_option(&self) -> Option<&dyn ProtobufValue> {
+        self.as_ref().map(|v| v as &dyn ProtobufValue)
     }
 
-    fn set_value(&mut self, value: &ProtobufValue) {
+    fn set_value(&mut self, value: &dyn ProtobufValue) {
         match value.as_any().downcast_ref::<V>() {
             Some(v) => mem::replace(self, SingularField::some(v.clone())),
             None => panic!(),
@@ -37,11 +37,11 @@
 }
 
 impl<V: ProtobufValue + Clone + 'static> ReflectOptional for SingularPtrField<V> {
-    fn to_option(&self) -> Option<&ProtobufValue> {
-        self.as_ref().map(|v| v as &ProtobufValue)
+    fn to_option(&self) -> Option<&dyn ProtobufValue> {
+        self.as_ref().map(|v| v as &dyn ProtobufValue)
     }
 
-    fn set_value(&mut self, value: &ProtobufValue) {
+    fn set_value(&mut self, value: &dyn ProtobufValue) {
         match value.as_any().downcast_ref::<V>() {
             Some(v) => mem::replace(self, SingularPtrField::some(v.clone())),
             None => panic!(),
diff --git a/src/reflect/repeated.rs b/src/reflect/repeated.rs
index 43e265d..be232f4 100644
--- a/src/reflect/repeated.rs
+++ b/src/reflect/repeated.rs
@@ -8,7 +8,7 @@
 pub trait ReflectRepeated: 'static {
     fn reflect_iter(&self) -> ReflectRepeatedIter;
     fn len(&self) -> usize;
-    fn get(&self, index: usize) -> &ProtobufValue;
+    fn get(&self, index: usize) -> &dyn ProtobufValue;
 }
 
 impl<V: ProtobufValue + 'static> ReflectRepeated for Vec<V> {
@@ -22,7 +22,7 @@
         Vec::len(self)
     }
 
-    fn get(&self, index: usize) -> &ProtobufValue {
+    fn get(&self, index: usize) -> &dyn ProtobufValue {
         &self[index]
     }
 }
@@ -39,7 +39,7 @@
         <[_]>::len(self)
     }
 
-    fn get(&self, index: usize) -> &ProtobufValue {
+    fn get(&self, index: usize) -> &dyn ProtobufValue {
         &self[index]
     }
 }
@@ -55,13 +55,13 @@
         RepeatedField::len(self)
     }
 
-    fn get(&self, index: usize) -> &ProtobufValue {
+    fn get(&self, index: usize) -> &dyn ProtobufValue {
         &self[index]
     }
 }
 
 trait ReflectRepeatedIterTrait<'a> {
-    fn next(&mut self) -> Option<&'a ProtobufValue>;
+    fn next(&mut self) -> Option<&'a dyn ProtobufValue>;
 }
 
 struct ReflectRepeatedIterImplSlice<'a, V: ProtobufValue + 'static> {
@@ -71,26 +71,26 @@
 impl<'a, V: ProtobufValue + 'static> ReflectRepeatedIterTrait<'a>
     for ReflectRepeatedIterImplSlice<'a, V>
 {
-    fn next(&mut self) -> Option<&'a ProtobufValue> {
-        self.iter.next().map(|v| v as &ProtobufValue)
+    fn next(&mut self) -> Option<&'a dyn ProtobufValue> {
+        self.iter.next().map(|v| v as &dyn ProtobufValue)
     }
 }
 
 pub struct ReflectRepeatedIter<'a> {
-    imp: Box<ReflectRepeatedIterTrait<'a> + 'a>,
+    imp: Box<dyn ReflectRepeatedIterTrait<'a> + 'a>,
 }
 
 impl<'a> Iterator for ReflectRepeatedIter<'a> {
-    type Item = &'a ProtobufValue;
+    type Item = &'a dyn ProtobufValue;
 
     fn next(&mut self) -> Option<Self::Item> {
         self.imp.next()
     }
 }
 
-impl<'a> IntoIterator for &'a ReflectRepeated {
+impl<'a> IntoIterator for &'a dyn ReflectRepeated {
     type IntoIter = ReflectRepeatedIter<'a>;
-    type Item = &'a ProtobufValue;
+    type Item = &'a dyn ProtobufValue;
 
     fn into_iter(self) -> Self::IntoIter {
         self.reflect_iter()
@@ -110,7 +110,7 @@
 }
 
 pub enum ReflectRepeatedRef<'a> {
-    Generic(&'a ReflectRepeated),
+    Generic(&'a dyn ReflectRepeated),
     U32(&'a [u32]),
     U64(&'a [u64]),
     I32(&'a [i32]),
@@ -120,8 +120,8 @@
     Bool(&'a [bool]),
     String(&'a [String]),
     Bytes(&'a [Vec<u8>]),
-    Enum(Box<ReflectRepeatedEnum<'a> + 'a>),
-    Message(Box<ReflectRepeatedMessage<'a> + 'a>),
+    Enum(Box<dyn ReflectRepeatedEnum<'a> + 'a>),
+    Message(Box<dyn ReflectRepeatedMessage<'a> + 'a>),
 }
 
 impl<'a> ReflectRepeatedRef<'a> {
diff --git a/src/reflect/value.rs b/src/reflect/value.rs
index 2671805..16d5266 100644
--- a/src/reflect/value.rs
+++ b/src/reflect/value.rs
@@ -14,7 +14,7 @@
     fn as_ref(&self) -> ReflectValueRef;
 
     /// Convert to `Any`
-    fn as_any(&self) -> &Any {
+    fn as_any(&self) -> &dyn Any {
         unimplemented!()
     }