10     if constexpr(sizeof...(rs) > 0)  in g()
19     if constexpr (true)  in f()
31     if constexpr (false)  in f()
43     if constexpr (5) {} // expected-error {{cannot be narrowed}}  in f()
46     if constexpr (N) {} // expected-error {{cannot be narrowed}}  in g()
56       if constexpr (sizeof(T) == 1 && sizeof(x) == 1)  in f()
63       if constexpr (sizeof(T) == 1)  in g()
64         if constexpr (sizeof(x) == 1)  in g()
80       case 4: if constexpr(sizeof(n) == 4) return;  in in_switch()
81     if constexpr(sizeof(n) == 4)  in in_switch()
84       if constexpr (sizeof(n) == 4) // expected-note 2{{constexpr if}}  in in_switch()
94       if constexpr (sizeof(T) == 4) // expected-note 2{{constexpr if}}  in in_switch_tmpl()
103     if constexpr(sizeof(n) == 4) // expected-note {{constexpr if}}  in goto_scope()
106     if constexpr(sizeof(n) == 4)  in goto_scope()
113     if constexpr(sizeof(n) == 4) // expected-note {{constexpr if}}  in goto_scope()
116     if constexpr(sizeof(n) == 4)  in goto_scope()
121 a:  if constexpr(sizeof(n) == 4) // expected-error {{redefinition}} expected-note {{constexpr if}}  in goto_redef()
129     if constexpr (true || ({evil_label: false;})) {} // expected-note {{constexpr if}}  in evil_things()
131     if constexpr (true) // expected-note {{constexpr if}}  in evil_things()