Improve ErrorPropagationExpr handling

gcc/rust/ChangeLog:

	* ast/rust-ast-pointer-visitor.cc (PointerVisitor::visit):
	Handle the expression contained in an ErrorPropagationExpr.
	* ast/rust-ast-visitor.cc (DefaultASTVisitor::visit): Likewise.

Signed-off-by: Owen Avery <powerboat9.gamer@gmail.com>

Author: powerboat9

gcc/rust/ast/rust-ast-pointer-visitor.cc

@@ -220,6 +220,7 @@ void
 PointerVisitor::visit (AST::ErrorPropagationExpr &expr)
 {
   visit_outer_attrs (expr);
+  reseat (expr.get_propagating_expr_ptr ());
 }
 
 void

gcc/rust/ast/rust-ast-visitor.cc

@@ -248,6 +248,7 @@ void
 DefaultASTVisitor::visit (AST::ErrorPropagationExpr &expr)
 {
   visit_outer_attrs (expr);
+  visit (expr.get_propagating_expr ());
 }
 
 void