[ANN] Propagate 1.0 - Error/status propagation in Lua

["Soni L." <fakedme@...>]

Propagate is a module for cleanly propagating error/status codes to the 
caller.

Repo: https://bitbucket.org/TeamSoni/propagate

Features:
- Depends on APow[1]. (Seems like I've been doing a lot of stuff that 
depends on APow, eh?)
- Coroutine tricks.
- Incompatible with Typecheck[2] because I'm a n00b.

Examples:

On a Linux system, the following:

- - -

local propagate = require "propagate"

local f = propagate.enable ^ function(x)
  propagate.propagate(x:write("hello\n"))
  propagate.propagate(x:close())
  return x
end

print(1, f(io.open("/dev/null", 'w')))
print(2, f(io.open("/dev/null")))
print(3, f(io.stdout))

- - -

outputs:

- - -

1    file (closed)
2    nil    Bad file descriptor    9
hello
3    nil    cannot close standard file

- - -

[1] http://marc.info/?l=lua-l&m=148745285529221&w=2
[2] http://marc.info/?l=lua-l&m=148755896416687&w=2

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