Segmentation fault on accessing fields of tagged unions

[timfayz]

Zig Version

0.12.0-dev.2127+fcc0c5ddc

Steps to Reproduce and Observed Behavior

const std = @import("std");

const Union = union(enum) {
    Foo: u8,
    Bar: f64,
};

pub fn main() !void {
    std.log.debug("{any}", .{Union.Foo});
}

Gives:

zig run bugAccessTaggedUnion.zig 
LLVM Emit Object... zsh: segmentation fault  zig run bugAccessTaggedUnion.zig

System: MacOS Monterey, 12.0.1, Apple M1

Expected Behavior

Using @compilerLog(Union.Foo) instead, gives:

@as(@typeInfo(bugAccessTaggedUnion.Union).Union.tag_type.?, .Foo)

[Vexu]

-fstrip can be used as a workaround.

/home/vexu/Documents/zig/zig/lib/std/debug.zig:342:14: 0x9d8c71c in assert (zig)
    if (!ok) unreachable; // assertion failure
             ^
/home/vexu/Documents/zig/zig/src/Module.zig:6191:11: 0xa258cdd in getUnionLayout (zig)
    assert(u.haveLayout(ip));
          ^
/home/vexu/Documents/zig/zig/src/codegen/llvm.zig:2653:50: 0x9f00521 in lowerDebugTypeImpl (zig)
                const layout = mod.getUnionLayout(union_obj);
                                                 ^
/home/vexu/Documents/zig/zig/src/codegen/llvm.zig:1210:48: 0x9ef7171 in emit (zig)
                _ = try self.lowerDebugTypeImpl(entry, .full, annotated.toDIType());
                                               ^
/home/vexu/Documents/zig/zig/src/Compilation.zig:2660:25: 0x9f03ac3 in emitLlvmObject (zig)
    try llvm_object.emit(.{
                        ^