False positive "unused var"

[trikko]

Using IntelliJ Idea with Dscanner I get a tip: "Variable foo is never used"

void test()
{
    int foo;

    {
        foo = 1;
    }
}

[Hackerpilot]

What did you use foo for in this example?

[Hackerpilot]

To clarify: If I removed all lines referencing foo from that function, what would change?

[trikko]

Ok, I misunderstood error message. The message says "not used" but i thought that "foo = 1" was an usage. Maybe it is "unread" :)

[ghost]

So this wasn't an issue ?

[trikko]

I think it is. Other ides report this warning as "never read".

[ghost]

Yes but "never used" is not a false positive.

[trikko]

Imo this is an unused var:

{ int a; ... }

In previous example it is used (assigned) but never read.

[Hackerpilot]

Finding variables that are written to but never read is one of the purposes of this check. I'm tempted to close this as not a bug.