Auto-completion of typedef structs doesn't work with pointers. Example that triggers it:

typedef struct FooInternal Foo;
struct FooInternal {
    int a;
};

int main()
{
    Foo* f;
    f-> // No auto completion is happening here.
}

Note that when doing the typedef after the struct has been defined does work. But not when the typedef precedes the struct definition. The code cannot be rearranged to put the typedef after the definition: the typedef is in a header file because 'Foo' is part of the public API (it's an opaque type that needs to be passed around), while the actual definition is in a *.c file.

(This is related to QTCREATORBUG-6783, but no one replied there.)