If you catch a CSVException and need a string representation, then depending on which Throwable.toString overload you call, you'll get a different string, missing different information.

The toString() one will return an additional row/column index, but no stack trace.

The one accepting a sink will return the stack trace as usual, but no row/column information.

import std.csv;
import std.stdio;

void main()
{
    try
        "a,b\n1,2,3\n".csvReader!(string[string])(null);
    catch (Exception e)
    {
        // Prints stack trace
        stderr.writeln(e);
        // Prints "(Row: 1, Col: 3)" but no stack trace
        stderr.writeln(e.toString());
    }
}