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debug.getupvalue
Debug
getupvalue
Returns one upvalue from a Lua function or stack level by one-based index. Invalid stack levels raise “Level out of range”, non-Lua functions raise “Lua Function expected”, indexes below 1 raise “Upvalue index starts at 1”, and indexes past the available upvalues raise “Upvalue index out of range”. debug.getupvalue is an alias.
Returns one upvalue from a Lua function or stack level by one-based index. Invalid stack levels raise “Level out of range”, non-Lua functions raise “Lua Function expected”, indexes below 1 raise “Upvalue index starts at 1”, and indexes past the available upvalues raise “Upvalue index out of range”. debug.getupvalue is an alias.