[cc65] cc65 bug (?)

Hi,

The program
---------------------------------------------
#include <stdio.h>

short s = 1000;

void foo(char c)
{
  s += c;
}

void main(void)
{
  foo(-10);

  printf("\n%d\n", s);
}
---------------------------------------------
should print out 990 but compiled with a rather recent cc65 snapshot
it does print out 1246. This is independent from the cc65
optimizations and seems to result from a sign promotion issue of the
formal parameter in foo().

Thanks in advance for your consideration, Oliver
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