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hm
d
You have a couple of options here.
1) You could make 
sleepers
a 
val
instead of 
var
.
2) You could do 
sleepers = sleepers - player.uniqueId
3) You could do 
sleepers.also { it -= player.uniqueId }
k
Or you know, 
sleepers.remove(players.uniqueId)
could be what you want.
d
4) You could do 
sleepers.remove(player.uniqueId)
, if you give up on operators.
s
@Iaroslav Postovalov What is the declared type of 
sleepers
?
k
var sleepers: MutableSet<UUID>
s
How do you know that for sure, @karelpeeters?
k
There's a conflict between 
Set<UUID>.minus
and 
MutableCollection<UUID>.minusAssign
, so we need a type that's both: probably 
MutableSet<UUID>
.
s
Probably, yes, but not necessarily...
k
I don't think I've ever come across another type that's both a set and mutable but not a mutableset.
s
Because if it is a MutableSet of UUID, it should not give this compiler error
k
This problem only happens when it's a 
var
as well.
💯 1
s
Ah! I didn't see you wrote 
var
... Yep, you're absolutely right, the 
var
(instead of 
val
) is the problem
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