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Sometimes includes aren't used anymore so it should detect that.

Example:

#include <string.h>
void test (void)
{
    printf ("Test\n"); // The string library isn't used.
}

Find and report unclosed brackets of all sorts.

With an file format implemented, it would be easier to use the linter for other languages to.
Also it would be cleaner than implement each keyword itself into the code.
In addition to that, the upgrades / fixes for an language wouldn't require recompiling the program.

Report lines that contains dead code.

Example:

int test (int i)
{
    if (i == 1)
    {
        return 1;
        i++; /* Dead code: It will never get called.*/
    }

    return 0;
}

Report unsafe code lines. Maybe it could provide an description why this code is unsafe and an way to do this right.