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debug.getlocalSYNOPSIS
debug.getlocal([thread,]level,local)
DESCRIPTION
This function returns the name and the value of the local variable with index local of the
function at level level of the stack. (The first parameter or local variable has index 1, and so
on, until the last active local variable.) 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 debug.getinfo to check whether the level is valid.)
NOTES
Variable names starting with '(' (open parentheses) represent internal variables (loop control
variables, temporaries, and C function locals).