Seqan mini-bowtie example not compiling - c++

Question

I try to copy the example of mini-bowtie from the Seqan Web site.
Note that the example comes from version 1.4.2, not the current one.
When I compile, I have an error.
The minimal reproducible example is:
#include <seqan/index.h>
#include <seqan/store.h>
using namespace seqan;
int main()
{
typedef Index<StringSet<Dna5String>, FMIndex<> > TIndex;
typedef Iterator<TIndex, TopDown<ParentLinks<> > >::Type TIter;
FragmentStore<> fragStore;
StringSet<Dna5String> text;
TIndex fmIndex(text);
TIter it(fmIndex);
it = TIter(fmIndex); // This does not work
return 0;
}
The compiling error is quite long.
It starts with:
In file included from test.cpp:1:
In file included from /usr/include/seqan/index.h:172:
/usr/include/seqan/index/index_fm_stree.h:469:16: error: no matching constructor for initialization of 'TVertexDescriptor' (aka 'VertexFM<unsigned long, seqan::SimpleType<unsigned char, seqan::Dna5_> >')
return TVertexDescriptor(back(it.history).range, back(it.history).repLen, back(it.history).lastChar);
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/seqan/index/index_esa_stree.h:245:27: note: in instantiation of function template specialization 'seqan::nodeUp<seqan::StringSet<seqan::String<seqan::SimpleType<unsigned char, seqan::Dna5_>,
seqan::Alloc<void> >, seqan::Owner<seqan::Tag<seqan::Default_> > >, void, seqan::FMIndexConfig<void, unsigned long, 1, 1>, seqan::Preorder>' requested here
_parentDesc = nodeUp(_origin);
^
/usr/include/seqan/index/index_esa_stree.h:366:29: note: in instantiation of function template specialization 'seqan::Iter<seqan::Index<seqan::StringSet<seqan::String<seqan::SimpleType<unsigned char,
seqan::Dna5_>, seqan::Alloc<void> >, seqan::Owner<seqan::Tag<seqan::Default_> > >, seqan::FMIndex<void, seqan::FMIndexConfig<void, unsigned long, 1, 1> > >, seqan::VSTree<seqan::TopDown<seqan::Preorder> >
>::operator=<seqan::ParentLinks<seqan::Preorder> >' requested here
*(TBase*)(this) = _origin;
^
test.cpp:17:8: note: in instantiation of member function 'seqan::Iter<seqan::Index<seqan::StringSet<seqan::String<seqan::SimpleType<unsigned char, seqan::Dna5_>, seqan::Alloc<void> >,
seqan::Owner<seqan::Tag<seqan::Default_> > >, seqan::FMIndex<void, seqan::FMIndexConfig<void, unsigned long, 1, 1> > >, seqan::VSTree<seqan::TopDown<seqan::ParentLinks<seqan::Preorder> > > >::operator='
requested here
it = TIter(fmIndex);
^
It seems that the API has slightly changed, but I cannot exactly put the finger on it.
I compile with:
clang++ -Wall -Wextra -Weffc++ -O2 -o testSeqan test.cpp -lrt
with clang++ 6.0.0-1ubuntu2 x86_64-pc-linux-gnu, but g++ Ubuntu 7.3.0-16ubuntu3 gives similar (albeit less readable) results, and Seqan version 2.3.2.
What should I change?