Ref in f#

let a = ref 5  // allocates a new record on the heap
let b = a      // b references the same record
b := 10        // modifies the value of 'a' as well!

let mutable a = 5 // mutable value on the stack
let mutable b = a // new mutable value initialized to current value of 'a'
b <- 10           // modifies the value of 'b' only!

-2

Source: stackoverflow.com

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