make Context::Emit pass SourceLocation

PiperOrigin-RevId: 529172439

src/google/protobuf/compiler/rust/context.h

@@ -106,10 +106,15 @@ class Context {
   }
 
   // Forwards to Emit(), which will likely be called all the time.
-  void Emit(absl::string_view format) const { printer_->Emit(format); }
-  void Emit(absl::Span<const io::Printer::Sub> vars,
-            absl::string_view format) const {
-    printer_->Emit(vars, format);
+  void Emit(absl::string_view format,
+            io::Printer::SourceLocation loc =
+                io::Printer::SourceLocation::current()) const {
+    printer_->Emit(format, loc);
+  }
+  void Emit(absl::Span<const io::Printer::Sub> vars, absl::string_view format,
+            io::Printer::SourceLocation loc =
+                io::Printer::SourceLocation::current()) const {
+    printer_->Emit(vars, format, loc);
   }
 
  private:

src/google/protobuf/io/printer.h

@@ -465,6 +465,9 @@ class AnnotationProtoCollector : public AnnotationCollector {
 // call_ descriptor.
 class PROTOBUF_EXPORT Printer {
  private:
+  struct AnnotationRecord;
+
+ public:
   // This type exists to work around an absl type that has not yet been
   // released.
   struct SourceLocation {
@@ -473,9 +476,6 @@ class PROTOBUF_EXPORT Printer {
     int line() { return 0; }
   };
 
-  struct AnnotationRecord;
-
- public:
   static constexpr char kDefaultVariableDelimiter = '$';
   static constexpr absl::string_view kProtocCodegenTrace =
       "PROTOC_CODEGEN_TRACE";