[ruby-core:91610] [Ruby trunk Bug#15616] Chained destructive methods fail when using +@to unfreeze a frozen string

Issue #15616 has been updated by ahorek (Pavel Rosick.


```
+foo.gsub!("bar", "car")
```
 stands for
```
+(foo.gsub!("bar", "car"))
```
and because foo is frozen, you'll get an error, see #15606


try this
```
foo = "bar".freeze
foo = (+foo).gsub!("bar", "car")
```
or
```
foo = "bar".freeze
foo = foo.gsub("bar", "car")
```


----------------------------------------
Bug #15616: Chained destructive methods fail when using +@ to unfreeze a frozen string
https://bugs.ruby-lang.org/issues/15616#change-76877

* Author: cianooooo (Cian O)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.6.1
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
Using the +@ syntax to unfreeze a string does not work when chaining destructive methods

Consider the following;
``` ruby
foo = "bar".freeze
+foo.gsub!("bar", "car")
```

This raises;
``` ruby
FrozenError: can't modify frozen String
```

However, I would have expected this to work since +@ should return a duplicated mutable string.



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