debug.setlocal ([thread,] level, local, value)

This function assigns the value value to the local variable with index local of the function at level level of the stack. The function returns nil if there is no local variable with the given index, and raises an error when called with a level out of range. (You can call getinfo to check whether the level is valid.) Otherwise, it returns the name of the local variable.

EVERYTHING
The Debug Library
debug.debug
debug.getfenv
debug.gethook
debug.getinfo
debug.getlocal
debug.getmetatable
debug.getregistry
debug.getupvalue
debug.setfenv
debug.sethook
debug.setlocal
debug.setmetatable
debug.setupvalue
debug.traceback

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