1const std = @import("std");
 2const expect = std.testing.expect;
 3
 4test "comptime vars" {
 5    var x: i32 = 1;
 6    comptime var y: i32 = 1;
 7
 8    x += 1;
 9    y += 1;
10
11    try expect(x == 2);
12    try expect(y == 2);
13
14    if (y != 2) {
15        // This compile error never triggers because y is a comptime variable,
16        // and so `y != 2` is a comptime value, and this if is statically evaluated.
17        @compileError("wrong y value");
18    }
19}
20
21// test