/in/foo.c: In function 'main':
/in/foo.c:5:16: error: 'new' undeclared (first use in this function)
    5 |     while(2-1){new double();};
      |                ^~~
/in/foo.c:5:16: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:5:19: error: expected ';' before 'double'
    5 |     while(2-1){new double();};
      |                   ^~~~~~~
      |                   ;