fix(prost-build): MSRV for Context

prost-build/src/context.rs

@@ -7,7 +7,7 @@ use prost_types::{
 
 use crate::extern_paths::ExternPaths;
 use crate::message_graph::MessageGraph;
-use crate::{path, BytesType, Config, MapType, ServiceGenerator};
+use crate::{BytesType, Config, MapType, ServiceGenerator};
 
 /// The context providing all the global information needed to generate code.
 /// It also provides a more disciplined access to Config
@@ -49,20 +49,29 @@ impl<'a> Context<'a> {
 
     /// Returns an iterator over the additional attributes configured
     /// for the named type.
-    pub fn type_attributes(&self, fq_type_name: &str) -> path::Iter<'_, String> {
-        self.config.type_attributes.get(fq_type_name)
+    pub fn type_attributes(&self, fq_type_name: &str) -> impl Iterator<Item = &str> {
+        self.config
+            .type_attributes
+            .get(fq_type_name)
+            .map(|s| s.as_str())
     }
 
     /// Returns an iterator over the additional attributes configured
     /// for the named message.
-    pub fn message_attributes(&self, fq_message_name: &str) -> path::Iter<'_, String> {
-        self.config.message_attributes.get(fq_message_name)
+    pub fn message_attributes(&self, fq_message_name: &str) -> impl Iterator<Item = &str> {
+        self.config
+            .message_attributes
+            .get(fq_message_name)
+            .map(|s| s.as_str())
     }
 
     /// Returns an iterator over the additional attributes configured
     /// for the named enum.
-    pub fn enum_attributes(&self, fq_enum_name: &str) -> path::Iter<'_, String> {
-        self.config.enum_attributes.get(fq_enum_name)
+    pub fn enum_attributes(&self, fq_enum_name: &str) -> impl Iterator<Item = &str> {
+        self.config
+            .enum_attributes
+            .get(fq_enum_name)
+            .map(|s| s.as_str())
     }
 
     /// Returns an iterator over the additional attributes configured
@@ -71,14 +80,15 @@ impl<'a> Context<'a> {
         &self,
         fq_message_name: &str,
         field_name: &str,
-    ) -> path::Iter<'_, String> {
+    ) -> impl Iterator<Item = &str> {
         self.config
             .field_attributes
             .get_field(fq_message_name, field_name)
+            .map(|s| s.as_str())
     }
 
     /// Returns the bytes type configured for the named message field.
-    pub fn bytes_type(&self, fq_message_name: &str, field_name: &str) -> BytesType {
+    pub(crate) fn bytes_type(&self, fq_message_name: &str, field_name: &str) -> BytesType {
         self.config
             .bytes_type
             .get_first_field(fq_message_name, field_name)
@@ -87,7 +97,7 @@ impl<'a> Context<'a> {
     }
 
     /// Returns the map type configured for the named message field.
-    pub fn map_type(&self, fq_message_name: &str, field_name: &str) -> MapType {
+    pub(crate) fn map_type(&self, fq_message_name: &str, field_name: &str) -> MapType {
         self.config
             .map_type
             .get_first_field(fq_message_name, field_name)