Assertion failure when @alignOf(SomeStruct) is called without first referencing SomeStruct

[scurest]

$ cat a.zig
const io = @import("std").io;

const Foo = struct { x: u32, y: u32, z: u32, };

pub fn main() -> %void {
    _ = Foo { .x = 1, .y = 2, .z = 3 };
    %%io.stdout.printf("{}\n", usize(@alignOf(Foo)));
}
$ zig/build/zig build_exe a.zig && ./a
12

This is ok, but if you delete the line _ = Foo { ... }; you get this instead

$ zig/build/zig build_exe a.zig
zig: /home/scurest/zig/src/analyze.cpp:1645: void resolve_struct_type(CodeGen*, TypeTableEntry*): Assertion `LLVMStoreSizeOfType(g->target_data_ref, struct_type->type_ref) > 0' failed.
Aborted (core dumped)

It seems to work if you create a Foo or if you create a function type that contains Foo (eg. _ = fn() -> Foo;). It doesn't work if you reference Foo by itself (_ = Foo;) or underneath a pointer.

(Also, 12 isn't the right alignment, cf. #37?)

[andrewrk]

Thanks for the report. Hoping to look at this and your other report tonight.

[scurest]

Thanks! No rush or anything. It's a really neat language, by the way :)