getfenv/setfenv fail when pcalled with a stack level of 1

[matthewdean]

print(getfenv(1))
--> table: 17546A48

print(pcall(getfenv,1))
--> false bad argument #1 to '?' (invalid level)

The same applies to setfenv:

env = getfenv(1)
setfenv(1,env)
--> no output

print(pcall(setfenv,1,env))
--> false bad argument #1 to '?' (invalid level)

[einsteinK]

Previously it returned the global env, then a proxy of it.
Now they made it error, as pcall(getfenv) (1 is default) would get the env of pcall itself, and not the functioning calling it.
(Also, getfenv(1) or getfenv() should never ever error.

Use xpcall to run it protected, just use level+1 (or 2, I forgot)

[matthewdean]

You can also get around this by doing:

pcall(function() return getfenv(1) end)

But it should still be fixed.

[einsteinK]

Your way will get the environment of the anonymous function.
(Which is the env it got created in, so yes, that would count)
But I think that your way with level 2 won't get the same result as getfenv(2).
(Given that there were some calls in different environments)

[Anaminus]

So it seems like pcall ignores the stack or something. Here's some test code:

local i = 0
repeat
    local s,e = pcall(getfenv,i)
    print(i,s,e)
    i = i + 1
until not s

print()

local i = 0
repeat
    local s,e = pcall(function() return getfenv(i) end)
    print(i,s,e)
    i = i + 1
until not s

Here are the results in Lua 5.1.5:

0       true    table: 003D2DC0
1       true    table: 003D2DC0
2       true    table: 003D2DC0
3       true    table: 003D2DC0
4       false   bad argument #1 to '?' (invalid level)

0       true    table: 003D2DC0
1       true    table: 003D2DC0
2       true    table: 003D2DC0
3       true    table: 003D2DC0
4       true    table: 003D2DC0
5       false   test.lua:12: bad argument #1 to 'getfenv' (invalid level)

And the results in Roblox:

0 true table: 1DB6ACC0
1 false bad argument #1 to '?' (invalid level)

0 true table: 1DB6ACC0
1 true table: 1DB6ACC0
2 false Workspace.Script:12: bad argument #1 to 'getfenv' (invalid level)