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#include <stdio.h>
 
#define LIST int: foo1
#define LIST LIST, double: foo2	    // Add double to the list
#define LIST LIST, default: bar	    // Add default
 
#define foo(X) _Generic((X), LIST)(X)
 
 
void foo1(int x)
{
    printf("foo1\n");
}
 
void foo2(int x)
{
    printf("foo2\n");
}
 
void bar(char x)
{
    printf("bar\n");
}
 
int main(void)
{
    foo(1);
    foo(1.1);
    return 0;
}

prog.c:4: warning: "LIST" redefined
 #define LIST LIST, double: foo2     // Add double to the list
 
prog.c:3: note: this is the location of the previous definition
 #define LIST int: foo1
 
prog.c:5: warning: "LIST" redefined
 #define LIST LIST, default: bar     // Add default
 
prog.c:4: note: this is the location of the previous definition
 #define LIST LIST, double: foo2     // Add double to the list
 
prog.c: In function ‘main’:
prog.c:5:14: error: unknown type name ‘LIST’
 #define LIST LIST, default: bar     // Add default
              ^~~~
prog.c:7:30: note: in expansion of macro ‘LIST’
 #define foo(X) _Generic((X), LIST)(X)
                              ^~~~
prog.c:27:5: note: in expansion of macro ‘foo’
     foo(1);
     ^~~
prog.c:5:14: error: unknown type name ‘LIST’
 #define LIST LIST, default: bar     // Add default
              ^~~~
prog.c:7:30: note: in expansion of macro ‘LIST’
 #define foo(X) _Generic((X), LIST)(X)
                              ^~~~
prog.c:28:5: note: in expansion of macro ‘foo’
     foo(1.1);
     ^~~

Standard output is empty