[LLVMbugs] [Bug 22029] New: generic lambda: failed to interpret a string when the string is in a pair

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=22029

            Bug ID: 22029
           Summary: generic lambda: failed to interpret a string when the
                    string is in a pair
           Product: clang
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++14
          Assignee: unassignedclangbugs at nondot.org
          Reporter: wang_feng at live.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Example code:

template< typename ... Args >
auto list( Args ... args )
{
    return [=]( auto func ){ return func( args... ); };
}

template< typename List_1, typename List_2 >
auto cons( List_1 list_1, List_2 list_2 )
{
    return list_1( [=]( auto ... args_1 ){ return list_2( [=]( auto ... args_2
){ return list( args_1..., args_2...); } ); } );
}

template< typename Func, typename List >
auto map( Func func, List the_list )
{
    return the_list( [=]( auto ... elems ){ return list( func(elems)... ); } );
}

#include <string>
#include <utility>
#include <type_traits>
#include <iostream> 
int main()
{
    auto mfl = cons( cons( list( std::make_pair( std::string{"f1"}, [](int i){
return i; } ) ),
                 list( std::make_pair( std::string{"f2"}, []( double x, double
y){ return x*y; } ) ) ),
                 list( std::make_pair( std::string{"f3"}, [](std::string s){
return s+s; } ) ) );

    auto pair_printer = []( auto the_pair ) { std::cout << "id:" <<
the_pair.first << "\n"; return the_pair; };
    map( pair_printer, mfl );

    return 0;
}

the expected output is(gcc 4.9 gives):

id:f1
id:f2
id:f3

but clang(3.4 and 3.5) gives:

id:f1
id: 4S� 4S�
id:4S��4S��4S��S���
                            �S��
                                    84S��4S�

and clang 3.6 failed to link it.

An online version is here:
http://melpon.org/wandbox/permlink/6dnNByDwiAAl27as
Some discussion in stackoverflow is here:
http://stackoverflow.com/questions/27482444/strange-behaviour-of-generalized-lambda-in-c14

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