list.c: (in function list_addh)
list.c:24:5: Variable e is kept in true branch, but not kept in continuation.
   list.c:24:5: in true branch:
   list.c:23:7: Storage e becomes kept
   list.c:24:5: in continuation:
   list.c:12:22: Storage e becomes only
list.c:25:2: Storage *(l->next) reachable from parameter contains 1 undefined
                field: next
list.c: (in function list_addh2)
list.c:39:2: Storage *(l->next) reachable from parameter contains 1 undefined
                field: next

Finished checking --- 3 code warnings, as expected