[Bug c++/69223] New: ICE with polymorphic lambda

[nightstrike at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69223

            Bug ID: 69223
           Summary: ICE with polymorphic lambda
           Product: gcc
           Version: 5.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: nightstrike at gmail dot com
  Target Milestone: ---

The following code causes an ICE on gcc 4.9.3, 5.1, 5.2, and 5.3:
[If a fix is found, could it be backported to 4.9?]

#include <array>
#include <cstddef>
#include <vector>

int main(int argc, char * argv[]) {
  std::vector<std::array<std::uint32_t, 20>> out;
  std::vector<std::uint32_t> data;

  auto saveChan = [&](std::size_t size, auto const & src, auto & dest, auto &&
f) {
    for (std::size_t chan = 0; chan < size; ++chan)
      for (auto const & i: src)
        dest.emplace_back(f(i)[chan]);
  };
  saveChan(20, out, data, [](decltype(out)::value_type const & i){ return i;});

  return 0;
}


$ g++ -std=gnu++14 aa.cpp -c
aa.cpp: In lambda function:
aa.cpp:14:81: internal compiler error: Segmentation fault
  saveChan(20, out, dataInt32, [](decltype(out)::value_type const & i){ return
i;});
                                                                               
 ^
0x9def6f crash_signal
        ../../gcc/toplev.c:337
0x86c90e gimplify_return_expr
        ../../gcc/gimplify.c:1229
0x86c90e gimplify_expr(tree_node**, gimple_statement_base**,
gimple_statement_base**, bool (*)(tree_node*), int)
        ../../gcc/gimplify.c:7874
0x86e4b6 gimplify_stmt(tree_node**, gimple_statement_base**)
        ../../gcc/gimplify.c:5373
0x86c34d gimplify_cleanup_point_expr
        ../../gcc/gimplify.c:5149
0x86c34d gimplify_expr(tree_node**, gimple_statement_base**,
gimple_statement_base**, bool (*)(tree_node*), int)
        ../../gcc/gimplify.c:7990
0x86e4b6 gimplify_stmt(tree_node**, gimple_statement_base**)
        ../../gcc/gimplify.c:5373
0x86ed4b gimplify_bind_expr
        ../../gcc/gimplify.c:1099
0x86c2be gimplify_expr(tree_node**, gimple_statement_base**,
gimple_statement_base**, bool (*)(tree_node*), int)
        ../../gcc/gimplify.c:7824
0x86e4b6 gimplify_stmt(tree_node**, gimple_statement_base**)
        ../../gcc/gimplify.c:5373
0x86f36a gimplify_body(tree_node*, bool)
        ../../gcc/gimplify.c:8734
0x86f657 gimplify_function_tree(tree_node*)
        ../../gcc/gimplify.c:8887
0x769d27 cgraph_analyze_function(cgraph_node*)
        ../../gcc/cgraphunit.c:648
0x76aa57 analyze_functions
        ../../gcc/cgraphunit.c:1016
0x76b895 finalize_compilation_unit()
        ../../gcc/cgraphunit.c:2328
0x61e4d3 cp_write_global_declarations()
        ../../gcc/cp/decl2.c:4647
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