[Bug gdb/22481] New: Python Exception <class 'gdb.error'> Trying to read string with inappropriate type `int'.:

["hi-angel at yandex dot ru" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22481

            Bug ID: 22481
           Summary: Python Exception <class 'gdb.error'> Trying to read
                    string with inappropriate type `int'.:
           Product: gdb
           Version: 8.0.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: hi-angel at yandex dot ru
  Target Milestone: ---

#Steps to reproduce:

1. Write the following code to ~/gdb.py 

class my_print:
    def __init__(self, val):
        self.val = val
    def to_string(self):
        return self.val.string()

def lookup_type_my_int (val):
    if str(val.type) == 'int':
        return my_print(val)
    return None

gdb.pretty_printers.append(lookup_type_my_int)

2. Run `gdb -nh`
3. type `source ~/gdb.py`
4. type `print 1`

Expected result: the value of "val" is printed
Actual results: error "$1 = Python Exception <class 'gdb.error'> Trying to read
string with inappropriate type `int'.:".

#Additional info:

python version 3.6.3

Some more results because this issue might be useful for someone coming from
google in attempt to use pretty printers:

Using "return str(self.val)" results in "$1 = Python Exception <class
'RecursionError'> maximum recursion depth exceeded in comparison:
1"

And using simply "return self.val" results in "[1]    29554 segmentation fault
(core dumped)  gdb -q -nh"

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