Upvalues are closures over an external local variable, for example:
function newCounter ()
local i = 0
return function () -- closure
-- `i` is an "upvalue" because it is external relative to the closure
-- and is local to "newCounter"
i = i + 1
return i
end
endIt looks like Lua v.5.1 has the limit on a maximum number of upvalues set to 60;
Newer versions have it set to 255
This is a problem because pslua produces a chain of nested functions which has more than 60 upvalues (and quite possibly more than 255).
One example when it happens is when Effect expressions are composed
return Init_I_discard(function(..) ...
-- could be a big closure containing the rest of computation containing many
-- references to top level local variable definitions.
return Init_I_discard(function(..) ...
return Init_I_discard(function(..) ...Related:
Upvalues are closures over an external local variable, for example:
It looks like Lua v.5.1 has the limit on a maximum number of upvalues set to 60;
Newer versions have it set to 255
This is a problem because
psluaproduces a chain of nested functions which has more than 60 upvalues (and quite possibly more than 255).One example when it happens is when
Effectexpressions are composedRelated: