End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
instance method
IO::generic_readable#readchar
strio.readchar → string
ext/stringio/stringio.c
View on GitHub ↗
static VALUE
strio_readchar(VALUE self)
{
VALUE c = rb_funcallv(self, rb_intern("getc"), 0, 0);
if (NIL_P(c)) rb_eof_error();
return c;
}
See IO#readchar.