[ruby-core:88260] [Ruby trunk Bug#14957] MinGW, gcc 8.2.0, bootstraptest - failure ?

Issue #14957 has been reported by MSP-Greg (Greg L).

----------------------------------------
Bug #14957: MinGW, gcc 8.2.0, bootstraptest - failure ?
https://bugs.ruby-lang.org/issues/14957

* Author: MSP-Greg (Greg L)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.6.0dev (2018-08-01 trunk 64156) [x64-mingw32] ?
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
Very recently MSYS/MinGW updated gcc from 7.3.0 to 8.2.0.  For the most part, every test suite runs fine except the bootstraptest test, which has a single failure on Appveyor:

```
#1379 test_thread.rb: 
     Thread.new("foo", &Object.method(:class_eval)).join
  #=> killed by SIGSEGV (signal 11)  [ruby-dev:34128]
```

I believe the test is here [bootstraptest/test_thread.rb:L334](https://github.com/ruby/ruby/blob/e62214be87a53045dbec187c66e208bc303e0f60/bootstraptest/test_thread.rb#L334-L336), code below:

```
assert_normal_exit %q{
  Thread.new("foo", &Object.method(:class_eval)).join
}, '[ruby-dev: 34128]'
```

This is the first time I recall seeing an error in btest, so I haven't really looked at the code.  `assert_normal_exit` saves the string in a file, then runs it.  When I use the string with `ruby -e`, I get:

```
#<Thread:0x0000000002e7e5a8 run> terminated with exception (report_on_exception is true):
Traceback (most recent call last):
-e:1:in `class_eval': Can't eval on top of Fiber or Thread (RuntimeError)
```

Not sure if that implies anything...  

Four of the builds using gcc 8.2.0 are on Appveyor, downloading and running locally, the following passes (from bootstraptest):
```
ruby -v runner.rb --ruby=C:/Greg/Ruby99-x64b/bin/ruby.exe -v --sets=thread
```

Let's say I'm confused, fails on Appveyor, passes locally, etc.  If anyone has any suggestions...

Thanks, Greg



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