void CollectSideEffectExpressions(AstExpression::Ptr node, AstExpression::List& exprs)
{
AstExpression_CollectSideEffectExpressions visitor(exprs);
node->Accept(&visitor);
}
void PrintExpression(AstExpression::Ptr expression, AstDeclaration* scope, CSharpNameResolver& resolver, ostream& o, string prefix)
{
CSharpExpressionCodegen codegen(resolver, o, prefix, scope);
expression->Accept(&codegen);
}