Unwrapped optional aliasing footgun #2915
Description
const std = @import("std");
const Thing = struct {
initial_sample: ?usize,
};
pub fn main() void {
var thing = Thing {
.initial_sample = 3,
};
if (thing.initial_sample) |t| {
std.debug.warn("before: {}\n", t); // prints 3
thing.initial_sample = null;
std.debug.warn("after: {}\n", t); // prints 0
}
}This should print 3 both times. Also,
if (thing.initial_sample) |t| {
std.debug.warn("before: {}\n", t); // prints 3
thing.initial_sample = 2;
std.debug.warn("after: {}\n", t); // prints 2
}I think this broke some time in the past month. (It manifested as a noticeable runtime bug in my game project.)