Why can one use a mutable reference but not a second one?

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Why can't I have more than one mutable reference to a value?

fn main() { let mut x = 10; let a = &mut x; let b = &mut x; // This makes 'a' variable useless *a += 10; println!("{}", a); } I understand for strings why you can't have more than one mutable reference but how come for integers, it is a fixed size, where as strings can have a dynamic size, so string data types are stored in the heap and integers are stored on the stack as they are fixed size. But why can't I have more than two mutable reference for integers? What risk doe…