[Bug c++/81718] New: g++ segfault when creating type alias

["adrienstalain at hotmail dot fr" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81718

            Bug ID: 81718
           Summary: g++ segfault when creating type alias
           Product: gcc
           Version: 7.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: adrienstalain at hotmail dot fr
  Target Milestone: ---

Created attachment 41927
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41927&action=edit
source file

* command to reproduce
$ g++ file.cc

* Compiler Output:
```
file.cc:8:63: internal compiler error: Segmentation fault
 template <typename T> using Ref = TRef<Make_Instance<T>::value>;
                                                               ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://bugs.archlinux.org/> for instructions.
```


* gcc version 7.1.1 20170630 (GCC) 
* Target: x86_64-pc-linux-gnu
* Configured with: /build/gcc-multilib/src/gcc/configure --prefix=/usr
--libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man
--infodir=/usr/share/info --with-bugurl=https://bugs.archlinux.org/
--enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ --enable-shared
--enable-threads=posix --enable-libmpx --with-system-zlib --with-isl
--enable-__cxa_atexit --disable-libunwind-exceptions --enable-clocale=gnu
--disable-libstdcxx-pch --disable-libssp --enable-gnu-unique-object
--enable-linker-build-id --enable-lto --enable-plugin
--enable-install-libiberty --with-linker-hash-style=gnu
--enable-gnu-indirect-function --enable-multilib --disable-werror
--enable-checking=release --enable-default-pie --enable-default-ssp

I think that in this case, the preprocessed file is not needed.