[PATCH] Fix typo in unordered_map deduction guide, missing "typename ="

[Jonathan Wakely]

On 24/11/17 18:03 +0100, Stephan Bergmann wrote:
>Otherwise, at least recent Clang trunk with -std=gnu++17 complains
>
>>In file included from lib/gcc/x86_64-pc-linux-gnu/8.0.0/../../../../include/c++/8.0.0/functional:60:
>>In file included from lib/gcc/x86_64-pc-linux-gnu/8.0.0/../../../../include/c++/8.0.0/unordered_map:47:
>>lib/gcc/x86_64-pc-linux-gnu/8.0.0/../../../../include/c++/8.0.0/bits/unordered_map.h:1197:5: error: deduction guide template contains a template parameter that cannot be deduced
>>    unordered_map(initializer_list<pair<_Key, _Tp>>, _Allocator)
>>    ^
>>lib/gcc/x86_64-pc-linux-gnu/8.0.0/../../../../include/c++/8.0.0/bits/unordered_map.h:1196:34: note: non-deducible template parameter (anonymous)
>>           _RequireAllocator<_Allocator>>
>>                                        ^
>>1 error generated.
>

Committed to trunk, backport to gcc-7-branch will follow.

I created https://gcc.gnu.org/PR83181 for the accepts-invalid bug. All
our tests pass with or without the fix, and even with that deduction
guide completely deleted, so I don't understand what it's supposed to
be for. This is hardly the only thing I don't understand about
deduction guides.