ext/rbs_extension/location.h in rbs-3.5.0 vs ext/rbs_extension/location.h in rbs-3.5.1.pre.1

@@ -14,20 +14,22 @@
   range rg;
 } rbs_loc_entry;
 
 typedef unsigned int rbs_loc_entry_bitmap;
 
+// The flexible array always allocates, but it's okay.
+// This struct is not allocated when the `rbs_loc` doesn't have children.
 typedef struct {
   unsigned short len;
   unsigned short cap;
   rbs_loc_entry_bitmap required_p;
-  rbs_loc_entry entries[0];
+  rbs_loc_entry entries[1];
 } rbs_loc_children;
 
 typedef struct {
   VALUE buffer;
   range rg;
-  rbs_loc_children *children;
+  rbs_loc_children *children; // NULL when no children is allocated
 } rbs_loc;
 
 /**
  * Returns new RBS::Location object, with given buffer and range.
  * */