• Basile B. (11/11) Oct 27 2016 Here are the specifications of token strings:
• Johan Engelen (2/13) Oct 27 2016 Try '}'
• Basile B. (7/25) Oct 27 2016 Yes and many others. Since I've posted this message I've realized

Basile B. <b2.temp gmx.com> writes:

Here are the specifications of token strings:

"Token strings open with the characters q{ and close with the 
token }. In between must be valid D tokens. The { and }"

So we can deduce that any invalid D token inside a token string 
will lead to a compilation error. Indeed:

void main()
{

}

produces an error.

So are you able to find more invalid token ?

Johan Engelen <j j.nl> writes:

On Friday, 28 October 2016 at 05:16:45 UTC, Basile B. wrote:
 Here are the specifications of token strings:

 "Token strings open with the characters q{ and close with the 
 token }. In between must be valid D tokens. The { and }"

 So we can deduce that any invalid D token inside a token string 
 will lead to a compilation error. Indeed:

 void main()
 {

 }

 produces an error.

 So are you able to find more invalid token ?

Try  '}'

Basile B. <b2.temp gmx.com> writes:

On Friday, 28 October 2016 at 06:21:38 UTC, Johan Engelen wrote:
 On Friday, 28 October 2016 at 05:16:45 UTC, Basile B. wrote:
 Here are the specifications of token strings:

 "Token strings open with the characters q{ and close with the 
 token }. In between must be valid D tokens. The { and }"

 So we can deduce that any invalid D token inside a token 
 string will lead to a compilation error. Indeed:

 void main()
 {

 }

 produces an error.

 So are you able to find more invalid token ?

 Try  '}'

Yes and many others. Since I've posted this message I've realized 
that actually there are much invalid tokens. Any character that's 
not an Universal Alpha and that's not in a string prevents 
compilation.

A complete list is at page 451 in 
http://www.open-std.org/JTC1/SC22/WG14/www/docs/n1124.pdf