Too many variables in that function?

The scope doesn't matter if you have a pike 7.x older than a few days.

Testcase:

void main(int num, array args) { string a = args[0];

if(1) { int b=4711; }

sscanf(a, "X%s", string c); write("%O\n", c); }

Was this a bug intruduced after 7.6.66, or did it start manifesting due to some other change?

The bug actually could be triggered in older pikes too, but was a bit harder; try the following:

int main(int argc, array(string) argv) { int i;

for (i = 0; i < 4; i++) { sscanf("", "%d", int test); werror("test: %d\n", test); test = i+1; } }

I hope it isn't the fix that causes huge stack frames :)

should be changed to "causing local variables to almost never be reused"?

No, the variables were never reused. The local lvalue bug that was triggered by local variables being reused was however possible to trigger even before.