End of Life Ruby 3.2 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

class method

ENV.clone

ENV.clone(freeze: nil) # raises TypeError

static VALUE
env_clone(int argc, VALUE *argv, VALUE obj)
{
    if (argc) {
        VALUE opt;
        if (rb_scan_args(argc, argv, "0:", &opt) < argc) {
            rb_get_freeze_opt(1, &opt);
        }
    }

    rb_raise(rb_eTypeError, "Cannot clone ENV, use ENV.to_h to get a copy of ENV as a hash");
}

Raises TypeError, because ENV is a wrapper for the process-wide environment variables and a clone is useless. Use to_h to get a copy of ENV data as a hash.

See also .clear .delete .assoc .delete_if also in 4.1 · 4.0 · 3.4 · 3.3 · 3.1

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