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RE: Why is the Debugger is not breaking on a specific line for the IsPrime Code sample
f#

I have attempted to set a break point on line 3 for the following code sample taken from the Microsoft MSDN :

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 let isPrime n =
       let rec check i =
            i > n/2 || (n % i <> 0 && check (i + 1))
       check 2

  isPrime 87

The breakpoint instead moves to the check 2 statement. Why is this happening?

However, the breakpoint breaks as expected for the revised code sample:

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   let isPrime n =
         let rec check i =
              if i > n/2 then
                  true
              elif (n % i <> 0 && check (i + 1))  then
                  true
              else
                   false
            check 2
  isPrime 87
.

Looks like a bug; I'll file one.

A simple workaround seems to be to add a let, e.g. in VS2010, I can put a breakpoint on the 'let r' line below:

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let isPrime n =
    let rec check i =
        let r = i > n/2 || (n % i <> 0 && check (i + 1))
        r
    check 2
 
isPrime 87
By on 7/12/2010 12:02 PM ()

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