Unexpected behaviour when ttline>0

[robertbachmann]

Given the following input:

\ttline=0

Listing 1: 
\begtt\hisyntax{C}
int main() {
  return 0;
}
\endtt

% \ttline=0

Listing 2: 
\begtt\hisyntax{C}
int foo() {
  return 0;
}
\endtt

\bye

I get the following result:

Is this intended?
Do I need to (re)set \ttline=0 for each listing?

[olsak]

Yes, it is documented behavior. Unfortunately, numbering each listing form one is somewhat tricky:

\everytt{\ttline=0} \ttline=0

I'll think about a better solution...