Same as [gets]
    :   '''[chan] gets''' ''channelId'' ?''varName''?
Reads a line ''without terminating newline'' (as defined by the channel's '''-translation''' option) from the channel, ''channelId''.
If ''varName'' is omitted, the result is the string content of the line.
If ''varName'' is provided, the line is written to that variable and the result is the length of line that was read (again, not including the terminator) or '''-1''' if some sort of exceptional condition occurred (see [chan blocked] and [chan eof]).
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