prog.c:10:2: error: unknown type name ‘TList’
TList* next;
^
prog.c:12:2: error: unknown type name ‘TList’
TList *prev;
^
prog.c: In function ‘main’:
prog.c:18:2: error: unknown type name ‘TList’
TList a;
^
prog.c:18:8: warning: unused variable ‘a’ [-Wunused-variable]
TList a;
^