End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
instance method
Symbol#[]
sym[idx] → char
sym[b, n] → string
string.c
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static VALUE
sym_aref(int argc, VALUE *argv, VALUE sym)
{
return rb_str_aref_m(argc, argv, rb_sym2str(sym));
}
Returns sym.to_s[].