remove unused member_exprt::symbol()

Reverts d47d503; the method isn't used.

Author: Daniel Kroening

jbmc/unit/java-testing-utils/require_goto_statements.cpp

@@ -99,7 +99,7 @@ require_goto_statements::find_struct_component_assignments(
 
             if(
               superclass_expr.get_component_name() == supercomponent_name &&
-              superclass_expr.symbol().get_identifier() == structure_name)
+              to_symbol_expr(superclass_expr.compound()).get_identifier() == structure_name)
             {
               if(
                 code_assign.rhs() ==
@@ -121,8 +121,8 @@ require_goto_statements::find_struct_component_assignments(
           // - component name: \p component_name
           // - operand (component of): symbol for \p structure_name
           if(
-            member_expr.op().id() == ID_symbol &&
-            member_expr.symbol().get_identifier() == structure_name &&
+            member_expr.compound().id() == ID_symbol &&
+            to_symbol_expr(member_expr.compound()).get_identifier() == structure_name &&
             member_expr.get_component_name() == component_name)
           {
             if(

src/util/std_expr.h

@@ -3529,18 +3529,6 @@ class member_exprt:public unary_exprt
   {
     return op0();
   }
-
-  // Retrieves the object(symbol) this member corresponds to
-  inline const symbol_exprt &symbol() const
-  {
-    const exprt &op=op0();
-    if(op.id()==ID_member)
-    {
-      return static_cast<const member_exprt &>(op).symbol();
-    }
-
-    return to_symbol_expr(op);
-  }
 };
 
 /// \brief Cast an exprt to a \ref member_exprt