Generated C headers contain invalid types.

[nmichaels]

Starting with this code:

const std = @import("std");

const Thingamajig = @OpaqueType();
const Thingamajigger = ThingHolder(i8, 8);
export fn do_thing(bar: *Thingamajigger) void {
    std.debug.warn("thing 0: {}\n", .{bar.*.things[0]});
}

pub fn thingify(foo: *Thingamajig) void {
    const bar = @ptrCast(*Thingamajigger, foo);
    do_thing(bar);
}

pub fn ThingHolder(comptime T: type, comptime count: usize) type {
    return struct {
        things: [count]T,
    };
}

Then running zig build-lib main.zig, I find this line in the generated header:

struct ThingHolder(i8,8);

If I change pub to export for do_thing, I also get this line:

void do_thing(struct ThingHolder(i8,8) * bar);

I expect it to either generate valid C tokens or abort with an error message.

[andrewrk]

I'd like to invest in self-hosted before investing in improving .h file generation; this way the work on this feature can be done once rather than twice.