Buffer overrun not detected when variable for iteration and for access is different

[php-coderrr]

cppcheck (git 77c5b793c9f6433884e8c0d1bbe37db4f0db09b4) doesn't detect such buffer overflow:

[c0der@rock ~/cppcheck]$ ./cppcheck testcase.c --all
Checking testcase.c...
[c0der@rock ~/cppcheck]$ cat testcase.c
void main()
{
        char arr[50];
        int n=0;
        for (int i=0; i<100; ++i)
                arr[n++] = 0;
}

[chrchr]

This is detected:

void f() {
        char arr[50];
        int n=0;
        for (int i=0; i<100; ++i) {
                n = i;
                arr[n] = 0;
        }
}

[kidkat]

comment:1 has been detected since 1.38 but regressed multiple times in-between - most recently from 2.0 to 2.1.