zig is low level in python. trust in human. the dangling pointer.

mise.toml

[tools]
zig = "latest"

ub.zig

const std = @import("std");
const print = std.debug.print;

pub fn ub() *u16 {
    var x: u16 = 69;
    x = 69;
    return &x; // Returning pointer to stack variable
}

pub fn ud() *u16 {
    var x: u16 = 420;
    x = 420;
    return &x; // Same problem
}

pub fn main() void {
    const a = ub();
    print("The integer is: {}\n", .{a.*}); // 69 - stack not reused yet

    _ = ud();
    print("The integer is: {}\n", .{a.*}); // 420 - ud() clobbered a's memory!

    const b = ud();
    print("The integer is: {}\n", .{b.*}); // 420
}