instance method
KeyError#key
() -> K?
key_error.key → object
error.c
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static VALUE
key_err_key(VALUE self)
{
VALUE key;
key = rb_ivar_lookup(self, id_key, Qundef);
if (!UNDEF_P(key)) return key;
rb_raise(rb_eArgError, "no key is available");
}
Return the key caused this KeyError exception.