debug.setstack Synchronous

setstack

Write one register in a visible Luau stack frame. It is a low-level tool for changing an active call’s state; inspect the slot first and restore it if you only need a temporary probe.

Syntax

Luau

debug.setstack(level: number, index: number, value: any) -> ()

Parameters

Function parameters
Parameter	Type	Description
`level`	`number`	Visible stack level to modify.
`index`	`number`	One-based register slot.
`value`	`any`	Value written into the slot.

Returns

()

No value.

Usage notes

The same numeric slot can mean something different in another call frame.

Example

Luau

local function inspect()
    local old = debug.getstack(1, 1)
    debug.setstack(1, 1, old) -- A harmless round trip of one slot
end
inspect()