[ruby-core:74989] [Ruby trunk Bug#12295] Ripper not emitting on_parse_error for global variable name syntax errors

Issue #12295 has been updated by Loren Segal.


After looking into this a little more it looks like the Ruby error is not a "parse error", though it probably should be? This might no longer be Ripper specific. Ruby just seems to give up on the above code no matter where it is placed in source:

```
$ ruby -e 'puts "one"; :~$ ; puts "two"'
-e:1: `$' without identifiers is not allowed as a global variable name
```

I would expect that if there is no syntax error that Ruby should print "one\ntwo".

----------------------------------------
Bug #12295: Ripper not emitting on_parse_error for global variable name syntax errors
https://bugs.ruby-lang.org/issues/12295#change-58115

* Author: Loren Segal
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-linux-gnu]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
----------------------------------------
Ripper is not emitting the `on_parse_error` event for certain types of syntax errors, specifically for the following snippet of code:

```
:~$
```

Here is the Ruby syntax error:

```
$ ruby -v
ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-linux-gnu]
$ ruby -e ':~$'
-e:1: `$' without identifiers is not allowed as a global variable name
```

Here is the expected Ripper result for a syntax error emitting `on_parse_error`:

```
$ ruby -rripper -e 'class X < Ripper; def on_parse_error(m) puts "ERROR #{m}" end end; X.parse "class;end"'
ERROR syntax error, unexpected ';'
```

Here is reproduction for the omitted `on_parse_error` event:

```
$ ruby -rripper -e 'class X < Ripper; def on_parse_error(m) puts "ERROR #{m}" end end; X.parse ":~$"'
$
```

Note the lack of ERROR message. The expectation is that this parse error will emit the `on_parse_error` event in Ripper.

I reproduced this in Ruby 2.3.0, I have not tested 2.2 or dev, so I don't know if it needs porting, though I imagine it does.



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