[C++ Patch] PR 44516

[Jason Merrill]

On 05/14/2012 07:17 PM, Paolo Carlini wrote:
> @@ -5670,7 +5672,8 @@ build_x_compound_expr_from_list (tree list, expr_l
>   	return error_mark_node;
>
>         for (list = TREE_CHAIN (list); list; list = TREE_CHAIN (list))
> -	expr = build_x_compound_expr (expr, TREE_VALUE (list),
> +	expr = build_x_compound_expr (EXPR_LOC_OR_HERE (expr), expr,
> +				      TREE_VALUE (list),
>                                         complain);

For a COMPOUND_EXPR, I think the relevant location is that of the comma, 
and since we don't have that location I think the location of the second 
expression is a closer approximation.

Note that when copying the location from one expression to another, 
EXPR_LOC_OR_HERE will change UNKNOWN_LOCATION to input_location, whereas 
EXPR_LOCATION will leave it alone.

Jason