// Member expressions
(a?.b)   ();
(a.b?.c)   ();
(a?.b.c)   ();
(a[b?.c])   ();
((a?.b).c)   ();
(a[b?.()])   ();
((a?.b).c)   ();
((a?.()).b)   ();

// Call expressions
(a?.())   ();
(a.b.c?.())   ();
(a.b?.c())   ();
(a?.b.c())   ();
(a(b?.c))   ();
((a?.b)())   ();
((a?.())())   ();

// Not `.callee`
foo(a?.b);

// In optional chaining
(a?.b())?.();
(a?.b()).c?.();