[Bug testsuite/31913] New: [gdb/testsuite] FAIL: gdb.python/py-mi-cmd.exp: -pycmd exp (unexpected output)

[Bug testsuite/31913] New: [gdb/testsuite] FAIL: gdb.python/py-mi-cmd.exp: -pycmd exp (unexpected output)

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31913

            Bug ID: 31913
           Summary: [gdb/testsuite] FAIL: gdb.python/py-mi-cmd.exp: -pycmd
                    exp (unexpected output)
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: testsuite
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

On fedora rawhide I ran into:
...
PASS: gdb.python/py-mi-cmd.exp: -pycmd dash-key
Expecting: ^(-pycmd exp[^M
]+)?(.*&"Traceback \(most recent call last\):.."^M
&"[^^M
]+py-mi-cmd.py[^^M
]+"^M
&"[^^M
]+raise gdb.GdbError\(\).."^M
&"gdb.GdbError.."^M
\^error,msg="Error occurred in Python\."[^M
]+[(]gdb[)] ^M
[ ]*)
-pycmd exp^M
&"Traceback (most recent call last):\n"^M
&"  File \"/data/vries/gdb/src/gdb/testsuite/gdb.python/py-mi-cmd.py\", line
76, in invoke\n    raise gdb.GdbError()\n"^M
&"gdb.GdbError\n"^M
^error,msg="Error occurred in Python."^M
(gdb) ^M
FAIL: gdb.python/py-mi-cmd.exp: -pycmd exp (unexpected output)
...

In contrast, a passing version looks like:
...
PASS: gdb.python/py-mi-cmd.exp: -pycmd dash-key
Expecting: ^(-pycmd exp[^M
]+)?(.*&"Traceback \(most recent call last\):.."^M
&"[^^M
]+py-mi-cmd.py[^^M
]+"^M
&"[^^M
]+raise gdb.GdbError\(\).."^M
&"gdb.GdbError.."^M
\^error,msg="Error occurred in Python\."[^M
]+[(]gdb[)] ^M
[ ]*)
-pycmd exp^M
&"Traceback (most recent call last):\n"^M
&"  File \"/data/vries/gdb/src/gdb/testsuite/gdb.python/py-mi-cmd.py\", line
76, in invoke\n"^M
&"    raise gdb.GdbError()\n"^M
&"gdb.GdbError\n"^M
^error,msg="Error occurred in Python."^M
(gdb) ^M
PASS: gdb.python/py-mi-cmd.exp: -pycmd exp
...

The difference seems to be:
...
&"  File \"/data/vries/gdb/src/gdb/testsuite/gdb.python/py-mi-cmd.py\", line
76, in invoke\n    raise gdb.GdbError()\n"^M
...
vs
...
&"  File \"/data/vries/gdb/src/gdb/testsuite/gdb.python/py-mi-cmd.py\", line
76, in invoke\n"^M
&"    raise gdb.GdbError()\n"^M
...

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