[ruby-core:101626] [Ruby master Bug#17425] Ripper.lex raises unexpected error

Issue #17425 has been reported by no6v (Nobuhiro IMAI).

----------------------------------------
Bug #17425: Ripper.lex raises unexpected error
https://bugs.ruby-lang.org/issues/17425

* Author: no6v (Nobuhiro IMAI)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.0.0dev (2020-12-22T08:12:51Z master f2f00e24fa) [x86_64-linux]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
```
$ cat /tmp/l.rb 
require "ripper"
pp Ripper.lex("def foo(arg1?:) end")
$ ./ruby -v /tmp/l.rb 
ruby 3.0.0dev (2020-12-22T08:12:51Z master f2f00e24fa) [x86_64-linux]
/var/tmp/git/ruby/ruby/.local/lib/ruby/3.0.0/ripper/lexer.rb:198:in `on_error2': undefined method `pos' for 30279:Integer (NoMethodError)
```

```
Breakpoint 1, ripper_dispatch2 (p=p@entry=0x555555c73240, mid=34721, a=93824999713440, b=b@entry=41775) at ripper.y:13336
13336	{
(gdb) rp p->lex.input
T_STRING: "def foo(arg1?:) end"
 bytesize:19 (embed) encoding:1 coderange:7bit $1 = (struct RString *) 0x555555c77400
(gdb) rb_id2name mid
ID: l(34721): on_param_error
(gdb) rp a
T_STRING: "formal argument must be local variable"
 bytesize:38 encoding:1 coderange:unknown $2 = (struct RString *) 0x555555c76aa0
(gdb) rp b
FIXNUM: 20887
(gdb) rb_id2name b
ID: j(41775): arg1?
(gdb) up
#1  0x00007ffff2c30719 in formal_argument (p=p@entry=0x555555c73240, lhs=lhs@entry=41775) at ripper.y:7881
7881		ERR("formal argument must be local variable");
(gdb) c
Continuing.
/var/tmp/git/ruby/ruby/.local/lib/ruby/3.0.0/ripper/lexer.rb:198:in `on_error2': undefined method `pos' for 20887:Integer (NoMethodError)
```




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