yuin / gopher-lua / 6466275660

90%

master: 90%

Pull #460

github

popen: support nil in second argument

In the C implementation of the Lua interpreter,
in the io.popen function the second argument can be nil:

Lua 5.1.5 Copyright (C) 1994-2012 Lua.org, PUC-Rio:

> x,y = io.popen("ls", nil)
> assert(x)
> assert(y == nil)
>

Gopher lua throws an exception:
bad argument #2 to popen (string expected, got nil)

Closes #459

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