Segfault when embedding cImport struct in a zig struct

[mil]

Running into a strange segfault when using @cImport:

Create sample.h in a folder:

typedef struct somecstruct {
    usize foo;
} somecstruct;

And then create foo.zig as:

const std = @import("std");
const sample = @cImport({
    @cInclude("sample.h");
});

pub const Foo = struct { 
  Bar: sample.somecstruct
};

pub fn main() !void {
    var d = @intCast(usize, 37);
    std.debug.warn("Converted {}\n", .{d});
    var x = .{ .Bar = .{ .foo = d } };
}

Run with:

zig run -lc foo.zig -I./

Produces:

> zig run -lc foo.zig -I./
Converted 37
Segmentation fault at address 0x201d90
/home/m/foo.zig:13:33: 0x203ce2 in main (foo)
    var x = .{ .Bar = .{ .foo = d } };
                                ^
/usr/lib/zig/std/start.zig:345:37: 0x204031 in std.start.main (foo)
            const result = root.main() catch |err| {
                                    ^
zsh: abort      zig run -lc foo.zig -I./

Tested on musl / Alpine linux with zig version:

> zig version
0.8.0-dev.1343+3c0238e73

[Vexu]

Duplicate of #3915.

Adding a type to x makes this work just fine:

pub const Foo = struct { 
  Bar: sample.somecstruct
};

pub fn main() !void {
    var d = @intCast(usize, 37);
    std.debug.warn("Converted {}\n", .{d});
    var x: Foo = .{ .Bar = .{ .foo = d } };
}