Public bug reported:
If you end a FORTRAN program with the continuation character '&'
followed by two newlines, gfortran SEGFAULTs when attempting to compile
the program.
This issue has a very minimal repro:
file: test.f90
```
end program &
```
The two newlines at the end are significant. The problem does not repro
with 1 or 0 newlines, though it does repro with more newlines. The
problem also repros when any of the lines following the continuation
contain a comment. The problem repros with both LF and CRLF line
endings.
I believe this program should compile without error.
Putting a token anywhere after the continuation, even separated by 2 or
more newlines, results in the expected error messages.
I'm running this on Windows Subsystem for Linux, though it's not likely
that is causing this bug.
The SEGFAULT error encountered:
```
andre@ANDREW-DESKTOP:/mnt/c/Users/andre/Projects/scratch$ 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-5/README.Bugs> for instructions.
```
gfortran --version
```
andre@ANDREW-DESKTOP:/mnt/c/Users/andre/Projects/scratch$ gfortran --version
GNU Fortran (Ubuntu 5.4.0-6ubuntu1~16.04.4) 5.4.0 20160609
Copyright (C) 2015 Free Software Foundation, Inc.
```
lsb_release -rd
```
andre@ANDREW-DESKTOP:/mnt/c/Users/andre/Projects/scratch$ lsb_release -rd
Description: Ubuntu 16.04.3 LTS
Release: 16.04
```
apt-cache policy gfortran
```
andre@ANDREW-DESKTOP:/mnt/c/Users/andre/Projects/scratch$ apt-cache policy
gfortran
gfortran:
Installed: 4:5.3.1-1ubuntu1
Candidate: 4:5.3.1-1ubuntu1
Version table:
*** 4:5.3.1-1ubuntu1 500
500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
100 /var/lib/dpkg/status
```
** Affects: gcc-5 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1720699
Title:
gfortran segfault on continuation at end of program followed by two or
more newlines
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