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20.8 Variables used before assignment
A warning is generated when any variable is used before it has been assigned a value.
For example, consider the following program.
transformed data {
real x;
if (1 > 2)
x = 1;
else
print("oops");
print(x);
}
Since x
is only assigned in one of the branches of the if
statement, it might get to print(x)
without having been assigned to.
Pedantic mode produces the following warning.
Warning at 'uninit-warn.stan', line 7, column 8 to column 9:
The variable x may not have been assigned a value before its use.