[texhax] Detection of start of source line

[Philip Taylor]

Further correction :

> This may help -- at least it generates no run-time errors :

> \def \treatasteriskspecially
>
>      { % space needed here
>
>          \ifx *\nexttoken
>
>              \let \nexttoken = \item
>
>          \else
>
>              \def \nexttoken {\char `\*}^ but not here
>
>          \fi
>
>          \nexttoken
>
>      }
>
> \catcode `\^^M = \active \def ^^M{\futurelet \nexttoken \treatasteriskspecially}
>
> abcd * efgh
>
> * ihjk * lmno
>
> \end
>

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