line_exec

 This takes the current line from the current buffer and executes it.
 This line must be a text line, it can't be a fold, virtual fold or end
 of fold line.

 An ideal use of this is in interactive key-binding. You could type on a
 line of its own in a buffer :-

      other_colours 7 7 112 112 112 7

 Then you could line_exec it to see what colours you get.
 If the results are not to your tastes, you can edit the line and repeat.

 This command has nothing to do with executing other sub-programs: for
 that see other_shell.