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c++/8031: ICE in comptypes, at cp/typeck.c:913

>Number:         8031
>Category:       c++
>Synopsis:       ICE in comptypes, at cp/typeck.c:913
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          ice-on-legal-code
>Submitter-Id:   net
>Arrival-Date:   Wed Sep 25 03:46:03 PDT 2002
>Originator:     VÁCLAV HAISMAN
>Release:        3.3 20020925 (experimental)
System: FreeBSD 4.6-STABLE FreeBSD 4.6-STABLE #0: Thu Aug 1 01:02:04 CEST 2002 i386

host: i386-unknown-freebsd4.6
build: i386-unknown-freebsd4.6
target: i386-unknown-freebsd4.6
configured with: ../srcdir/configure --enable-threads --enable-languages=c,c++ --enable-version-specific-runtime-libs --prefix=/home/4/wilx --with-arch=i686 --with-cpu=i686 --enable-dwarf2 : (reconfigured) ../srcdir/configure --enable-threads --enable-languages=c,c++ --enable-version-specific-runtime-libs --prefix=/home/4/wilx --with-arch=i686 --with-cpu=i686 --enable-dwarf2
testcase-cast.cxx: In member function `virtual bool B::f(const A*)':
testcase-cast.cxx:17: error: cannot convert from base `A' to derived type `B'
   via virtual base `A'
testcase-cast.cxx:17: internal compiler error: in comptypes, at cp/typeck.c:913
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:> for instructions.

#include <typeinfo>

class A {
    virtual bool f(const A* a) = 0;

class B : virtual public A {
    char ch;
    virtual bool f(const A* a);

bool B::f(const A* a)
    if (typeid(a) == typeid(B))
        if (ch == static_cast<const B&>(*a).ch)
            return true;
    return false;


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