End of Life Ruby 3.0 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

class method

ENV.rehash

ENV.rehash → nil

static VALUE
env_none(VALUE _)
{
    return Qnil;
}

(Provided for compatibility with Hash.)

Does not modify ENV; returns nil.

See also .rassoc .reject .merge! .reject! also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.1