1extern fn next_id() u32;
 2
 3const Foo = struct {
 4    bar: Bar,
 5
 6    fn init() Foo {
 7        return .{ .bar = .init() };
 8    }
 9};
10const Bar = struct {
11    qux: ?Qux,
12    id: u32,
13
14    fn init() Bar {
15        return .{
16            .qux = null,
17            .id = next_id(),
18        };
19    }
20};
21const Qux = struct {
22    handleThing: fn () void,
23};
24
25export fn entry() void {
26    const foo: Foo = .init();
27    _ = foo;
28}
29
30// error
31//
32// :17:26: error: comptime call of extern function
33// :7:31: note: called at comptime from here
34// :26:27: note: called at comptime from here
35// :26:27: note: call to function with comptime-only return type 'tmp.Foo' is evaluated at comptime
36// :6:15: note: return type declared here
37// :4:10: note: struct requires comptime because of this field
38// :11:10: note: struct requires comptime because of this field
39// :22:18: note: struct requires comptime because of this field
40// :22:18: note: use '*const fn () void' for a function pointer type