zig/test/cases/safety/bad union field access.zig

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543 B
Zig

const std = @import("std");
pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
_ = stack_trace;
if (std.mem.eql(u8, message, "access of union field 'float' while field 'int' is active")) {
std.process.exit(0);
}
std.process.exit(1);
}
const Foo = union {
float: f32,
int: u32,
};
pub fn main() !void {
var f = Foo { .int = 42 };
bar(&f);
return error.TestFailed;
}
fn bar(f: *Foo) void {
f.float = 12.34;
}
// run
// backend=llvm
// target=native