C++ backend: Cannot iterate over arrays of bool, sometimes

[rixed]

 [17 / 116] >>src/DessserQCheck.ml:926                                         In file included from src/dessser/runtime.h:15,                                                
                 from /tmp/dessser_dessser_test_52644ff8.cc:23:                        
src/dessser/Arr.h: In instantiation of ‘dessser::Arr<T>::Arr(TInit, std::function<T(TInit, T2)>, dessser::Arr<T2>) [with TInit = dessser::Void; T2 = bool; T = bool]’:        
/tmp/dessser_dessser_test_52644ff8.cc:1094:99:   required from here                                                                                                           
src/dessser/Arr.h:55:5: error: cannot bind non-const lvalue reference of type ‘bool&’ to an rvalue of type ‘bool’                                                             
   55 |     for (T2 &x2 : that) {                                                                                                                                             
      |     ^~~                                                                                                                                                               
In file included from /usr/include/c++/10/vector:68,                                                                                                                          
                 from /usr/include/c++/10/functional:62,                                                                                                                      
                 from /usr/include/c++/10/pstl/glue_algorithm_defs.h:13,                                                                                                      
                 from /usr/include/c++/10/algorithm:74,                                
                 from /tmp/dessser_dessser_test_52644ff8.cc:7:                                                                                                                
/usr/include/c++/10/bits/stl_bvector.h:86:5: note:   after user-defined conversion: ‘std::_Bit_reference::operator bool() const’                                              
   86 |     operator bool() const _GLIBCXX_NOEXCEPT                                                                                                                           
      |     ^~~~~~~~                                                                                                                                                          
cc1plus: note: unrecognized command-line option ‘-Wno-unused-lambda-capture’ may have been intended to silence earlier diagnostics                                            
 [18 / 116] >>src/DessserQCheck.ml:983                                         FAILURE: Failure("g++ -std=c++17 -g -O0 -W -Wall -Wno-unused-parameter -Wno-unused-variable -Wn
o-shift-negative-value -Wno-unused-lambda-capture -iquote src -iquote /tmp  \"/tmp/dessser_dessser_test_52644ff8.cc\" -o \"/tmp/dessser_dessser_test_52644ff8.x\" failed with 
code 1\n"):                                                                                                                                                                   
Raised at file "stdlib.ml", line 33, characters 17-33                                                                                                                         
Called from file "src/DessserBackEndCPP.ml", line 2017, characters 2-13                                                                                                       
Called from file "src/DessserQCheck.ml", line 927, characters 14-34                                                                                                           
Called from file "list.ml", line 106, characters 12-15                                                                                                                        
Called from file "src/DessserQCheck.ml", line 935, characters 4-127                                                                                                           
                                                                                                                                                                              
/usr/bin/timeout: Fatal error: exception File "src/DessserOCamlBackEndHelpers.ml", line 362, characters 4-10: Assertion failed                                                
Raised at file "src/DessserOCamlBackEndHelpers.ml", line 362, characters 4-25                                                                                                 
Called from file "src/DessserOCamlBackEndHelpers.ml", line 434, characters 25-35                                                                                              
Called from file "/tmp/dessser_dessser_test_55eefea8.ml", line 4243, characters 107-144 
Called from file "/tmp/dessser_dessser_test_55eefea8.ml", line 5436, characters 21-47
Called from file "/tmp/dessser_dessser_test_55eefea8.ml", line 5447, characters 2-10
Called from file "/tmp/dessser_dessser_test_55eefea8.ml", line 5452, characters 4-11

Child process exited with status code 2
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
Failure: >>src/DessserQCheck.ml:983

expected: (null ((0 1493052598159462) (-50276168747379 2341625361) null) ((2 65475) (96308331860597 null) null) null ((1 null) (null 4172393385) null) ((3 58352) (-3471506818
5019 4230523545) null))
but got: 
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