[Parted-maintainers] Bug#880035: parted: fails to use negative start value for 'mkpart' command without specyfying FS-TYPE

[Denis Pynkin]

Package: parted
Version: 3.2-18
Severity: normal

Dear Maintainer,

   * What led up to the situation?
Trying to create partition via 'mkpart' with negative START value 
without specyfying optional FS-TYPE.

   * What exactly did you do (or not do) that was effective (or
     ineffective)?
parted -a none -s -- /dev/vda mkpart flags_backup -4M -6177s
or with interactive mode:
(parted) mkpart flags_backup -4M -6177s

   * What was the outcome of this action?
Partition is not created with failure message:
 parted: invalid token: -4M
 Error: Expecting a file system type.

   * What outcome did you expect instead?
Partition is created.

-- System Information:
Debian Release: 9.1
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.57-std-def-alt1.1 (SMP w/4 CPU cores)
Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE=C.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages parted depends on:
ii  libc6         2.24-11+deb9u1
ii  libparted2    3.2-18
ii  libreadline7  7.0-3
ii  libtinfo5     6.0+20161126-1

parted recommends no packages.

Versions of packages parted suggests:
pn  parted-doc  <none>

-- no debconf information