Trailing contexts and lineno

[wim delvaux]

Is the lineno updated when the trailing contexts matches or when it is 
accepted

Suppos

%%
x/\n
\n

if the input is

x\n
x\n

is the lineno count for the first x 1 or 2 and the second 2 or 3 (i.e is the 
EOL taken into account immediately when seen or only when accepted

THax