[ruby-dev:50820] [Ruby master Bug#14240] warn four special variables: $; $, $/ $\

Issue #14240 has been updated by jeremyevans0 (Jeremy Evans).

File warn-5-gvars.patch added

Attached is a patch that adds a deprecation warning for the 5 global variables ($; $, $/ $\ $.), unless inside ruby `-e`.  However, there is use of these variables inside Ruby that should be fixed if we plan to make this change.  I've already seen the following issues:

```
/path/ruby/lib/erb.rb:907: warning: global variable $. is deprecated
../.././ext/ripper/tools/preproc.rb: warning: global variable $/ is deprecated
/path/ruby/lib/rubygems/specification.rb:14: warning: global variable $. is deprecated
```

It is likely there are more issues than just these three.

----------------------------------------
Bug #14240: warn four special variables: $; $, $/ $\
https://bugs.ruby-lang.org/issues/14240#change-80125

* Author: akr (Akira Tanaka)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
I think the four special variables for separators should be deprecated.

```
$/    input record separator (default argument for "gets")
$\    output record separator ("print" prints it at last)
$,    default separator for Array#join and print
$;    default separator for String#split
```

I feel many program doesn't work if they are set to non-default value.

Since they are global, not thread local,
we can not change these variables safely in a multi threaded program.

So, I think we should warn them (and delete them in future).





---Files--------------------------------
warn-5-gvars.patch (2.31 KB)


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