[Bug c/50422] New: -Wswitch warns about unhandled cases in nested switches

["devel at fresse dot org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50422

             Bug #: 50422
           Summary: -Wswitch warns about unhandled cases in nested
                    switches
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: devel@fresse.org


Linux plutos 2.6.37.6-0.7-desktop #1 SMP PREEMPT 2011-07-21 02:17:24 +0200
x86_64 x86_64 x86_64 GNU/Linux

freundt@clyde:pts/10:~> gcc --version
gcc (GCC) 4.7.0 20110811 (experimental)
Copyright (C) 2011 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Recipe to reproduce:
freundt@clyde:pts/10:~> gcc -x c -c -Wall -o /dev/null - <<EOF
typedef enum {
        NAUGHT,
        ONE,
        TWO,
} foo_t;

int
test(foo_t arg)
{
        switch (arg) {
        case NAUGHT:
        case ONE:
                switch (arg) {
                case NAUGHT:
                        return 0;
                case ONE:
                        return 1;
                }
                break;
        case TWO:
                return 2;
        }
        return -1;
}
EOF
<stdin>: In function 'test':
<stdin>:13:3: warning: enumeration value 'TWO' not handled in switch [-Wswitch]

This is _similar_ to bug 23577 but not quite as nested switches should be
easier to handle than separate fragments.