wrappign negation: print hex with casting to unsigned does not work

print_wrapping_example.zig

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

fn printRes(comptime ST: type, a: ST, b: ST) !void {
    const UT = switch (ST) {
        i2 => u2,
        i32 => u32,
        i64 => u64,
        i128 => u128,
        else => unreachable,
    };
    var sum: ST = a -% b;
    debug.print("{d} - {d}, signed wrappign({d}): {d}\n", .{ a, b, ST, sum });
    const N: UT = @bitSizeOf(ST);
    const min: ST = @bitCast(ST, (@as(UT, 1) << (N - 1)));

    const opssamesign: ST = ~(a ^ b);
    const sumdiffsign: ST = (a ^ @bitCast(ST, sum));
    const opssamprint = @bitCast(UT, opssamesign);
    const sumdiffprint = @bitCast(UT, sumdiffsign);
    const minprint = @bitCast(UT, min);
    debug.print("{x} (sum)\n{x} (operands same)\n{x} (sum different sign)\n{x} (min)\n", .{ sum, opssamprint, sumdiffprint, minprint });
}

pub fn main() !void {
    const ST = i2;
    var a: ST = -2;
    var b: ST = -2;
    try printRes(ST, a, b);
    b = -1;
    try printRes(ST, a, b);
    b = 0;
    try printRes(ST, a, b);
    b = 1;
    try printRes(ST, a, b);
    a = 1;
    try printRes(ST, a, b);
    b = -2;
    try printRes(ST, a, b);
    b = -1;
    try printRes(ST, a, b);
    b = 0;
    try printRes(ST, a, b);
    b = 1;
    try printRes(ST, a, b);
}

Output:
-2 - -2, signed wrappign(i2): 0
0 (sum)
3 (operands same)
2 (sum different sign)
2 (min)
-2 - -1, signed wrappign(i2): -1
-1 (sum)
2 (operands same)
1 (sum different sign)
2 (min)
-2 - 0, signed wrappign(i2): -2
-2 (sum)
1 (operands same)
0 (sum different sign)
2 (min)
-2 - 1, signed wrappign(i2): 1
1 (sum)
0 (operands same)
3 (sum different sign)
2 (min)
1 - 1, signed wrappign(i2): 0
0 (sum)
3 (operands same)
1 (sum different sign)
2 (min)
1 - -2, signed wrappign(i2): -1
-1 (sum)
0 (operands same)
2 (sum different sign)
2 (min)
1 - -1, signed wrappign(i2): -2
-2 (sum)
1 (operands same)
3 (sum different sign)
2 (min)
1 - 0, signed wrappign(i2): 1
1 (sum)
2 (operands same)
0 (sum different sign)
2 (min)
1 - 1, signed wrappign(i2): 0
0 (sum)
3 (operands same)
1 (sum different sign)
2 (min)