Yes I know that ian, but your little test program doesn't tell the reader what the result will be. I have just done some tests, and my assumption earlier appears to be correct.
1. Declare the constant _valcheck = 1
2. Every time you use var = val() in the program, then a variable called err will be set to 0 if the var=val() was without any errors, but if there is an error, then err=1.
I haven't checked the blank instance
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