/in/foo.cc: In instantiation of 'T IO::Read() [with T = int]':
/in/foo.cc:17:37:   required from here
/in/foo.cc:14:27: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
   while( isdigit(c))  x=(x+(x<<2)<<1)+(c^48),c=gc();
                          ~^~~~~~~