zig/test/cases/issue_30095.zig

var e: anyerror = undefined;
const E = error{Err};
extern fn bar() u8;

fn foo() E!u8 {
    const x = bar();
    return if (x != 0) E.Err else 0;
}

pub fn main() !void {
    var val: bool = false;
    _ = &val;

    if (val) {
        const maybe = foo();
        _ = maybe catch {};
    } else {
        if (foo()) |byte| {
            _ = byte;
        } else |err| {
            e = err;
        }
    }
}

// compile
// output_mode=Obj
//