Zig; what I think after months of using it(strongly-typed-thoughts.net)

    const std = @import("std");

    fn throws(i: usize) !void {
        return switch (i) {
            0 => error.zero,
            1 => error.one,
            else => error.many,
        };
    }

    fn catches(i: usize) !void {
        throws(i) catch |err| {
            return switch (err) {
                error.one => error.uno,
                else => |other| other,
            };
        };
    }

    pub fn main() void {
        catches(std.os.argv.len) catch |err| {
            switch (err) {
                // Type error if you comment out any of these:
                // note: unhandled error value: 'error.zero'
                error.zero => std.debug.print("0\n", .{}),
                error.uno => std.debug.print("1\n", .{}),
                error.many => std.debug.print("2\n", .{}),
                // Type error if you uncomment this:
                // 'error.one' not a member of destination error set
                //error.one => std.debug.print("1\n", .{}),
            }
        };
    }