C file, not C++.

parser/expat/lib/moz_extensions.c

@@ -165,7 +165,7 @@ int MOZ_XMLTranslateEntity(const char* ptr, const char* end, const char** next,
   if (tok == XML_TOK_CHAR_REF) {
     int n = XmlCharRefNumber(enc, ptr);
 
-    // We could get away with just < 0, but better safe than sorry.
+    /* We could get away with just < 0, but better safe than sorry. */
     if (n <= 0) {
       return 0;
     }
@@ -174,8 +174,8 @@ int MOZ_XMLTranslateEntity(const char* ptr, const char* end, const char** next,
   }
 
   if (tok == XML_TOK_ENTITY_REF) {
-    // *next points to after the semicolon, so the entity ends at
-    // *next - enc->minBytesPerChar.
+    /* *next points to after the semicolon, so the entity ends at
+       *next - enc->minBytesPerChar. */
     XML_Char ch =
       (XML_Char)XmlPredefinedEntityName(enc, ptr, *next - enc->minBytesPerChar);
     if (!ch) {