Merge #1056 #1057

1056: Fix '#include <algorithm>' [#159] r=tschwinge a=tschwinge

... recently introduced in #1044 commit 35ca685200830626e5abd623f65a850649beace2
"macros: Add base functions to check for follow-set ambiguities".

GCC doesn't like that:

    In file included from [...]
    ./mm_malloc.h:42:12: error: attempt to use poisoned "malloc"
         return malloc (__size);
                ^

See commit e7b3f654f2ab0400c95c0517387a9ad645a5c4cd, for example.


1057: For use as 'std::unordered_map' key, provide 'std::hash' for 'Rust::AST::MacroFragSpec::Kind' enum class r=tschwinge a=tschwinge

... recently introduced in #1044 commit 35ca685200830626e5abd623f65a850649beace2
"macros: Add base functions to check for follow-set ambiguities".

Otherwise, at least with an oldish GCC 5.2, compilation of
'gcc/rust/parse/rust-parse.cc' fails noisily:

    In file included from [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/hashtable.h:35:0,
                     from [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/unordered_map:47,
                     from [GCC/Rust]/gcc/rust/rust-system.h:46,
                     from [GCC/Rust]/gcc/rust/rust-linemap.h:12,
                     from [GCC/Rust]/gcc/rust/lex/rust-lex.h:22,
                     from [GCC/Rust]/gcc/rust/parse/rust-parse.h:20,
                     from [GCC/Rust]/gcc/rust/parse/rust-parse.cc:17:
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/hashtable_policy.h: In instantiation of 'struct std::__detail::__is_noexcept_hash<Rust::AST::MacroFragSpec::Kind, std::hash<Rust::AST::MacroFragSpec::Kind> >':
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/type_traits:137:12:   required from 'struct std::__and_<std::__is_fast_hash<std::hash<Rust::AST::MacroFragSpec::Kind> >, std::__detail::__is_noexcept_hash<Rust::AST::MacroFragSpec::Kind, std::hash<Rust::AST::MacroFragSpec::Kind> > >'
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/type_traits:148:38:   required from 'struct std::__not_<std::__and_<std::__is_fast_hash<std::hash<Rust::AST::MacroFragSpec::Kind> >, std::__detail::__is_noexcept_hash<Rust::AST::MacroFragSpec::Kind, std::hash<Rust::AST::MacroFragSpec::Kind> > > >'
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/unordered_map.h:100:66:   required from 'class std::unordered_map<Rust::AST::MacroFragSpec::Kind, std::vector<Rust::TokenId> >'
    [GCC/Rust]/gcc/rust/parse/rust-parse.cc:101:5:   required from here
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/hashtable_policy.h:85:34: error: no match for call to '(const std::hash<Rust::AST::MacroFragSpec::Kind>) (const Rust::AST::MacroFragSpec::Kind&)'
      noexcept(declval<const _Hash&>()(declval<const _Key&>()))>
                                      ^
    In file included from [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/move.h:57:0,
                     from [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/stl_pair.h:59,
                     from [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/stl_algobase.h:64,
                     from [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/char_traits.h:39,
                     from [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/string:40,
                     from [GCC/Rust]/gcc/rust/rust-system.h:34,
                     from [GCC/Rust]/gcc/rust/rust-linemap.h:12,
                     from [GCC/Rust]/gcc/rust/lex/rust-lex.h:22,
                     from [GCC/Rust]/gcc/rust/parse/rust-parse.h:20,
                     from [GCC/Rust]/gcc/rust/parse/rust-parse.cc:17:
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/type_traits: In instantiation of 'struct std::__not_<std::__and_<std::__is_fast_hash<std::hash<Rust::AST::MacroFragSpec::Kind> >, std::__detail::__is_noexcept_hash<Rust::AST::MacroFragSpec::Kind, std::hash<Rust::AST::MacroFragSpec::Kind> > > >':
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/unordered_map.h:100:66:   required from 'class std::unordered_map<Rust::AST::MacroFragSpec::Kind, std::vector<Rust::TokenId> >'
    [GCC/Rust]/gcc/rust/parse/rust-parse.cc:101:5:   required from here
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/type_traits:148:38: error: 'value' is not a member of 'std::__and_<std::__is_fast_hash<std::hash<Rust::AST::MacroFragSpec::Kind> >, std::__detail::__is_noexcept_hash<Rust::AST::MacroFragSpec::Kind, std::hash<Rust::AST::MacroFragSpec::Kind> > >'
         : public integral_constant<bool, !_Pp::value>
                                          ^
    In file included from [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/unordered_map:48:0,
                     from [GCC/Rust]/gcc/rust/rust-system.h:46,
                     from [GCC/Rust]/gcc/rust/rust-linemap.h:12,
                     from [GCC/Rust]/gcc/rust/lex/rust-lex.h:22,
                     from [GCC/Rust]/gcc/rust/parse/rust-parse.h:20,
                     from [GCC/Rust]/gcc/rust/parse/rust-parse.cc:17:
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/unordered_map.h: In instantiation of 'class std::unordered_map<Rust::AST::MacroFragSpec::Kind, std::vector<Rust::TokenId> >':
    [GCC/Rust]/gcc/rust/parse/rust-parse.cc:101:5:   required from here
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/unordered_map.h:100:66: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<Rust::AST::MacroFragSpec::Kind> >, std::__detail::__is_noexcept_hash<Rust::AST::MacroFragSpec::Kind, std::hash<Rust::AST::MacroFragSpec::Kind> > > >'
           typedef __umap_hashtable<_Key, _Tp, _Hash, _Pred, _Alloc>  _Hashtable;
                                                                      ^
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/unordered_map.h:107:45: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<Rust::AST::MacroFragSpec::Kind> >, std::__detail::__is_noexcept_hash<Rust::AST::MacroFragSpec::Kind, std::hash<Rust::AST::MacroFragSpec::Kind> > > >'
           typedef typename _Hashtable::key_type key_type;
                                                 ^
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/unordered_map.h:108:47: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<Rust::AST::MacroFragSpec::Kind> >, std::__detail::__is_noexcept_hash<Rust::AST::MacroFragSpec::Kind, std::hash<Rust::AST::MacroFragSpec::Kind> > > >'
           typedef typename _Hashtable::value_type value_type;
                                                   ^
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/unordered_map.h:109:48: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<Rust::AST::MacroFragSpec::Kind> >, std::__detail::__is_noexcept_hash<Rust::AST::MacroFragSpec::Kind, std::hash<Rust::AST::MacroFragSpec::Kind> > > >'
           typedef typename _Hashtable::mapped_type mapped_type;
                                                    ^
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/unordered_map.h:110:43: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<Rust::AST::MacroFragSpec::Kind> >, std::__detail::__is_noexcept_hash<Rust::AST::MacroFragSpec::Kind, std::hash<Rust::AST::MacroFragSpec::Kind> > > >'
           typedef typename _Hashtable::hasher hasher;
                                               ^
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/unordered_map.h:111:46: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<Rust::AST::MacroFragSpec::Kind> >, std::__detail::__is_noexcept_hash<Rust::AST::MacroFragSpec::Kind, std::hash<Rust::AST::MacroFragSpec::Kind> > > >'
           typedef typename _Hashtable::key_equal key_equal;
                                                  ^
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/unordered_map.h:112:51: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<Rust::AST::MacroFragSpec::Kind> >, std::__detail::__is_noexcept_hash<Rust::AST::MacroFragSpec::Kind, std::hash<Rust::AST::MacroFragSpec::Kind> > > >'
           typedef typename _Hashtable::allocator_type allocator_type;
                                                       ^
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/unordered_map.h:117:45: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<Rust::AST::MacroFragSpec::Kind> >, std::__detail::__is_noexcept_hash<Rust::AST::MacroFragSpec::Kind, std::hash<Rust::AST::MacroFragSpec::Kind> > > >'
           typedef typename _Hashtable::pointer  pointer;
                                                 ^
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/unordered_map.h:118:50: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<Rust::AST::MacroFragSpec::Kind> >, std::__detail::__is_noexcept_hash<Rust::AST::MacroFragSpec::Kind, std::hash<Rust::AST::MacroFragSpec::Kind> > > >'
           typedef typename _Hashtable::const_pointer const_pointer;
                                                      ^
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/unordered_map.h:119:47: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<Rust::AST::MacroFragSpec::Kind> >, std::__detail::__is_noexcept_hash<Rust::AST::MacroFragSpec::Kind, std::hash<Rust::AST::MacroFragSpec::Kind> > > >'
           typedef typename _Hashtable::reference  reference;
                                                   ^
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/unordered_map.h:120:52: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<Rust::AST::MacroFragSpec::Kind> >, std::__detail::__is_noexcept_hash<Rust::AST::MacroFragSpec::Kind, std::hash<Rust::AST::MacroFragSpec::Kind> > > >'
           typedef typename _Hashtable::const_reference const_reference;
                                                        ^
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/unordered_map.h:121:46: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<Rust::AST::MacroFragSpec::Kind> >, std::__detail::__is_noexcept_hash<Rust::AST::MacroFragSpec::Kind, std::hash<Rust::AST::MacroFragSpec::Kind> > > >'
           typedef typename _Hashtable::iterator  iterator;
                                                  ^
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/unordered_map.h:122:51: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<Rust::AST::MacroFragSpec::Kind> >, std::__detail::__is_noexcept_hash<Rust::AST::MacroFragSpec::Kind, std::hash<Rust::AST::MacroFragSpec::Kind> > > >'
           typedef typename _Hashtable::const_iterator const_iterator;
                                                       ^
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/unordered_map.h:123:51: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<Rust::AST::MacroFragSpec::Kind> >, std::__detail::__is_noexcept_hash<Rust::AST::MacroFragSpec::Kind, std::hash<Rust::AST::MacroFragSpec::Kind> > > >'
           typedef typename _Hashtable::local_iterator local_iterator;
                                                       ^
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/unordered_map.h:124:57: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<Rust::AST::MacroFragSpec::Kind> >, std::__detail::__is_noexcept_hash<Rust::AST::MacroFragSpec::Kind, std::hash<Rust::AST::MacroFragSpec::Kind> > > >'
           typedef typename _Hashtable::const_local_iterator const_local_iterator;
                                                             ^
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/unordered_map.h:125:47: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<Rust::AST::MacroFragSpec::Kind> >, std::__detail::__is_noexcept_hash<Rust::AST::MacroFragSpec::Kind, std::hash<Rust::AST::MacroFragSpec::Kind> > > >'
           typedef typename _Hashtable::size_type  size_type;
                                                   ^
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/unordered_map.h:126:52: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<Rust::AST::MacroFragSpec::Kind> >, std::__detail::__is_noexcept_hash<Rust::AST::MacroFragSpec::Kind, std::hash<Rust::AST::MacroFragSpec::Kind> > > >'
           typedef typename _Hashtable::difference_type difference_type;
                                                        ^
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/unordered_map.h:280:7: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<Rust::AST::MacroFragSpec::Kind> >, std::__detail::__is_noexcept_hash<Rust::AST::MacroFragSpec::Kind, std::hash<Rust::AST::MacroFragSpec::Kind> > > >'
           operator=(initializer_list<value_type> __l)
           ^
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/unordered_map.h:379:2: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<Rust::AST::MacroFragSpec::Kind> >, std::__detail::__is_noexcept_hash<Rust::AST::MacroFragSpec::Kind, std::hash<Rust::AST::MacroFragSpec::Kind> > > >'
      emplace(_Args&&... __args)
      ^
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/unordered_map.h:432:7: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<Rust::AST::MacroFragSpec::Kind> >, std::__detail::__is_noexcept_hash<Rust::AST::MacroFragSpec::Kind, std::hash<Rust::AST::MacroFragSpec::Kind> > > >'
           insert(const value_type& __x)
           ^
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/unordered_map.h:439:2: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<Rust::AST::MacroFragSpec::Kind> >, std::__detail::__is_noexcept_hash<Rust::AST::MacroFragSpec::Kind, std::hash<Rust::AST::MacroFragSpec::Kind> > > >'
      insert(_Pair&& __x)
      ^
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/unordered_map.h:499:7: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<Rust::AST::MacroFragSpec::Kind> >, std::__detail::__is_noexcept_hash<Rust::AST::MacroFragSpec::Kind, std::hash<Rust::AST::MacroFragSpec::Kind> > > >'
           insert(initializer_list<value_type> __l)
           ^
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/unordered_map.h:645:7: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<Rust::AST::MacroFragSpec::Kind> >, std::__detail::__is_noexcept_hash<Rust::AST::MacroFragSpec::Kind, std::hash<Rust::AST::MacroFragSpec::Kind> > > >'
           equal_range(const key_type& __x)
           ^
    [GCC]/i686-pc-linux-gnu/include/c++/5.2.0/bits/unordered_map.h:649:7: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<Rust::AST::MacroFragSpec::Kind> >, std::__detail::__is_noexcept_hash<Rust::AST::MacroFragSpec::Kind, std::hash<Rust::AST::MacroFragSpec::Kind> > > >'
           equal_range(const key_type& __x) const
           ^
    [GCC/Rust]/gcc/rust/parse/rust-parse.cc: In function 'bool Rust::peculiar_fragment_match_compatible(Rust::AST::MacroMatchFragment&, Rust::AST::MacroMatch&)':
    [GCC/Rust]/gcc/rust/parse/rust-parse.cc:104:5: error: too many initializers for 'std::unordered_map<Rust::AST::MacroFragSpec::Kind, std::vector<Rust::TokenId> >'
         };
         ^
    [GCC/Rust]/gcc/rust/parse/rust-parse.cc:119:16: error: no match for 'operator[]' (operand types are 'std::unordered_map<Rust::AST::MacroFragSpec::Kind, std::vector<Rust::TokenId> >' and 'Rust::AST::MacroFragSpec::Kind')
        = follow_set[last_match.get_frag_spec ().get_kind ()];
                    ^
    make[2]: *** [[GCC/Rust]/gcc/rust/Make-lang.in:299: rust/rust-parse.o] Error 1


Co-authored-by: Thomas Schwinge <thomas@codesourcery.com>