1const std = @import("std");
 2
 3pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
 4    _ = stack_trace;
 5    if (std.mem.eql(u8, message, "access of union field 'float' while field 'int' is active")) {
 6        std.process.exit(0);
 7    }
 8    std.process.exit(1);
 9}
10
11const Foo = union {
12    float: f32,
13    int: u32,
14};
15
16pub fn main() !void {
17    var f = Foo{ .int = 42 };
18    bar(&f);
19    return error.TestFailed;
20}
21
22fn bar(f: *Foo) void {
23    f.float = 12.34;
24}
25// run
26// backend=selfhosted,llvm
27// target=x86_64-linux