Add AST::TuplePatternItems::TuplePatternItemType to differentiate between them

gcc/rust/ast/rust-pattern.h

@@ -1135,6 +1135,12 @@ protected:
 class TuplePatternItems
 {
 public:
+  enum TuplePatternItemType
+  {
+    MULTIPLE,
+    RANGED,
+  };
+
   virtual ~TuplePatternItems () {}
 
   // TODO: should this store location data?
@@ -1150,6 +1156,8 @@ public:
 
   virtual void accept_vis (ASTVisitor &vis) = 0;
 
+  virtual TuplePatternItemType get_pattern_type () const = 0;
+
 protected:
   // pure virtual clone implementation
   virtual TuplePatternItems *clone_tuple_pattern_items_impl () const = 0;
@@ -1234,6 +1242,11 @@ public:
     return patterns;
   }
 
+  TuplePatternItemType get_pattern_type () const override
+  {
+    return TuplePatternItemType::MULTIPLE;
+  }
+
 protected:
   /* Use covariance to implement clone function as returning this object rather
    * than base */
@@ -1312,6 +1325,11 @@ public:
     return upper_patterns;
   }
 
+  TuplePatternItemType get_pattern_type () const override
+  {
+    return TuplePatternItemType::RANGED;
+  }
+
 protected:
   /* Use covariance to implement clone function as returning this object rather
    * than base */