`'`/`"` on `//` line can start string parsing

[gtker]

// '

fails with Unterminated string.

// "

Fails with the same message.

Adding a second // ' or ' after the first does not fail.

This isn't a big deal, but it will cause weird failures if single line comments are used and somebody writes don't or something else that uses the apostrophe.

[gtker]

This is because of how // is tokenized. Because of the // CONSTANT 1 syntax anything after // is tokenized like normal.

This can be used for a rather fun exploit where you can arbitrarily remove code in a very unintuitive way.

For example, the following program will always return 1 and the output will not have an if statement in it.

int main() {
    int a = 0;
    // Will always happen, so wont't need rest of function
    if(a == 0) return 0;

    // Won't happen
    return 1;
}

This behavior is also present in at least cc_amd64 and most likely all other cc_* compilers.