Issue #15540 has been reported by bughit (bug hit).

----------------------------------------
Bug #15540: 2.6.0 Dir#glob regression
https://bugs.ruby-lang.org/issues/15540

* Author: bughit (bug hit)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
in an empty base folder create the following structure

```
.
└── c
    ├── d
    │ └── a
    │     ├── a.file
    │     └── b
    │         ├── b.file
    │         └── c
    │             └── c.file
    └── e
        └── a
            ├── a.file
            └── b
                ├── b.file
                └── c
                    └── c.file
```

execute the following in the base folder: `ruby -v -e 'pp Dir["c/{d,e}/a/**/"]'`

before 2.6

```
ruby 2.5.3p105 (2018-10-18 revision 65156) [x86_64-linux]
["c/d/a/", "c/d/a/b/", "c/d/a/b/c/", "c/e/a/", "c/e/a/b/", "c/e/a/b/c/"]
```

2.6
```
ruby 2.6.0p0 (2018-12-25 revision 66547) [x86_64-linux]
["c/d/a/a.file", "c/d/a/b", "c/e/a/a.file", "c/e/a/b"]
```



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