[Bug fortran/93563] New: Wrong code makes the compiler hang

[only_for_nouse at gmx dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93563

            Bug ID: 93563
           Summary: Wrong code makes the compiler hang
           Product: gcc
           Version: 9.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: only_for_nouse at gmx dot de
  Target Milestone: ---

Created attachment 47775
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47775&action=edit
Faulty code of a recursive data structure

In the attached code, the allocatable attribute should be pointer. So the code
is faulty, but the compiler just hangs and does not produce a meaningful error
message.
I am working on linux x86_64 platform.