Problem with std.string.strip(): Can't use result in format routine

[Azi Hassan via Digitalmars-d-learn]

On Tuesday, 5 September 2017 at 12:38:54 UTC, Ky-Anh Huynh wrote:
> Hi,
>
> I read line from STDIN , and strip them
>
> [code]
> auto line_st = line.strip();
> [/code]
>
>
> However, I can't use result in another format routine. Assume 
> my input line is "foobar":
>
> [code]
> writeln("Stripped line is %s", line_st);
> [/code]
>
> This code only prints "Stripped line is ". If I use instead
>
> [code]
> writeln("Stripped line is %s", line.strip());
> [/code]
>
> the result is "Stripped line is foobar".
>
> What're the difference between the two uses? I'm using `dmd 
> v2.075.1`.
>
> Thanks a lot.

Maybe it has something to do with how you read from STDIN. Can 
you show that part of the code to see if I can reproduce the 
issue ?