ast: Add Expr::Kind::Try

gcc/rust/ChangeLog:

	* ast/rust-ast.h: Add the new variant.
	* ast/rust-expr.h: Use it for TryExpr class.

Author: CohenArthur

gcc/rust/ast/rust-ast.h

@@ -1318,6 +1318,7 @@ class Expr : public Visitable
     TypeCast,
     Assignment,
     CompoundAssignment,
+    Try,
   };
 
   virtual Kind get_expr_kind () const = 0;

gcc/rust/ast/rust-expr.h

@@ -3792,7 +3792,7 @@ class TryExpr : public ExprWithBlock
     outer_attrs = std::move (new_attrs);
   }
 
-  Expr::Kind get_expr_kind () const override { return Expr::Kind::Return; }
+  Expr::Kind get_expr_kind () const override { return Expr::Kind::Try; }
 
 protected:
   /* Use covariance to implement clone function as returning this object rather