Comment 2 for bug 1720699

Repros in 17.04 (Hyper-V VM). Looking into 17.10.

gfortran test.f90 -o hello
```
f951: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-6/README.Bugs> for instructions.
```

gfortran --version
```
GNU Fortran (Ubuntu 6.3.0-12ubuntu2) 6.3.0 20170406
Copyright (C) 2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
```

lsb_release -rd
```
Description: Ubuntu 17.04
Release: 17.04
```

apt-cache policy gfortran
```
gfortran:
  Installed: 4:6.3.0-2ubuntu1
  Candidate: 4:6.3.0-2ubuntu1
  Version table:
*** 4:6.3.0-2ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu zesty/main amd64 Packages
        100 /var/lib/dpkg/status
```