Enable debugging with LLDB (Xcode, Qt Creator, etc)

* Print line directives before function definitions
* Add command line option to enable absolute paths in line directives (defaults to off)

These changes are required to enable debugging with LLDB (turn on absolute paths).

Update test-results with line directives before function definitions

regression-tests/test-results/mixed-bounds-safety-with-assert-2.cpp

@@ -37,6 +37,7 @@ auto add_42_to_subrange(auto& rng, cpp2::in<int> start, cpp2::in<int> end) -> vo
         std::cout << i << "\n";
 }
 
+#line 10 "mixed-bounds-safety-with-assert-2.cpp2"
 auto add_42_to_subrange(auto& rng, cpp2::in<int> start, cpp2::in<int> end) -> void
 {
     if (cpp2::Bounds.has_handler() && !(cpp2::cmp_less_eq(0,start)) ) { cpp2::Bounds.report_violation(""); }

regression-tests/test-results/mixed-bounds-safety-with-assert.cpp

@@ -36,6 +36,7 @@ auto print_subrange(auto const& rng, cpp2::in<int> start, cpp2::in<int> end) ->
     print_subrange(std::move(v), 1, 13);
 }
 
+#line 9 "mixed-bounds-safety-with-assert.cpp2"
 auto print_subrange(auto const& rng, cpp2::in<int> start, cpp2::in<int> end) -> void{
     if (cpp2::Bounds.has_handler() && !(cpp2::cmp_less_eq(0,start)) ) { cpp2::Bounds.report_violation(""); }
     if (cpp2::Bounds.has_handler() && !(cpp2::cmp_less_eq(end,CPP2_UFCS(ssize)(rng))) ) { cpp2::Bounds.report_violation(""); }

regression-tests/test-results/mixed-bugfix-for-ufcs-non-local.cpp

@@ -83,8 +83,10 @@ namespace ns {
 #line 21 "mixed-bugfix-for-ufcs-non-local.cpp2"
 template<t<CPP2_UFCS_NONLOCAL(f)(o)> _> auto g() -> void{}// Fails on GCC ([GCC109781][]) and Clang 12 (a lambda expression cannot appear in this context)
 
+#line 23 "mixed-bugfix-for-ufcs-non-local.cpp2"
 auto g([[maybe_unused]] cpp2::in<t<CPP2_UFCS_NONLOCAL(f)(o)>> unnamed_param_1) -> void{}// Fails on Clang 12 (lambda in unevaluated context).
 
+#line 25 "mixed-bugfix-for-ufcs-non-local.cpp2"
 auto g() -> void{
                      if (cpp2::Default.has_handler() && !(CPP2_UFCS(f)(o)) ) { cpp2::Default.report_violation(""); }}
 
@@ -100,5 +102,6 @@ auto g() -> void{
 #line 45 "mixed-bugfix-for-ufcs-non-local.cpp2"
 }
 
+#line 47 "mixed-bugfix-for-ufcs-non-local.cpp2"
 auto main() -> int{}
 

regression-tests/test-results/mixed-captures-in-expressions-and-postconditions.cpp

@@ -42,6 +42,7 @@ auto insert_at(cpp2::in<int> where, cpp2::in<int> val) -> void;
 
 std::vector<int> vec {}; 
 
+#line 19 "mixed-captures-in-expressions-and-postconditions.cpp2"
 auto insert_at(cpp2::in<int> where, cpp2::in<int> val) -> void
 
 #line 22 "mixed-captures-in-expressions-and-postconditions.cpp2"

regression-tests/test-results/mixed-float-literals.cpp

@@ -135,6 +135,7 @@ auto literals_cpp2() -> void{
   // 1.E-10F;
 }
 
+#line 114 "mixed-float-literals.cpp2"
 [[nodiscard]] auto main() -> int{
   literals_cpp1();
   literals_cpp2();

regression-tests/test-results/mixed-forwarding.cpp

@@ -44,6 +44,7 @@ CPP2_REQUIRES (std::is_same_v<CPP2_TYPEOF(t), std::pair<X,X>>) ;
 #line 11 "mixed-forwarding.cpp2"
 auto copy_from([[maybe_unused]] auto unnamed_param_1) -> void{}
 
+#line 13 "mixed-forwarding.cpp2"
 auto use([[maybe_unused]] auto const& unnamed_param_1) -> void{}
 
 #line 16 "mixed-forwarding.cpp2"
@@ -53,13 +54,15 @@ requires (std::is_same_v<CPP2_TYPEOF(t), std::pair<X,X>>) {
     copy_from(t.first);             // copies
     copy_from(CPP2_FORWARD(t).second);// moves
 }
+#line 20 "mixed-forwarding.cpp2"
 auto apply_explicit_forward(auto&& t) -> void
 requires (std::is_same_v<CPP2_TYPEOF(t), std::pair<X,X>>) {
 #line 21 "mixed-forwarding.cpp2"
     copy_from(CPP2_FORWARD(t).first);// moves
     copy_from(CPP2_FORWARD(t).second);// moves
 }
 
+#line 25 "mixed-forwarding.cpp2"
 [[nodiscard]] auto main() -> int{
     std::pair<X,X> t1 {1, 2}; 
     apply_implicit_forward(t1);

regression-tests/test-results/mixed-hello.cpp

@@ -39,6 +39,7 @@ auto main() -> int {
     return s; 
 }
 
+#line 11 "mixed-hello.cpp2"
 auto decorate(std::string& s) -> void{
     s = "[" + s + "]";
 }

regression-tests/test-results/mixed-increment-decrement.cpp

@@ -188,13 +188,16 @@ requires (bool(Op & 2))  { auto ret = x; ++x; return ret; }
 auto operator++(number_line_pre_increment<0>& x) -> number_line_pre_increment<0>& { return x;  }
 #line 51 "mixed-increment-decrement.cpp2"
 auto operator++(number_line_pre_increment<0>& x,int) -> number_line_pre_increment<0> { auto ret = x; ++x; return ret; }
+#line 52 "mixed-increment-decrement.cpp2"
 auto operator--(number_line_pre_decrement<0>& x) -> number_line_pre_decrement<0>& { return x;  }
 #line 52 "mixed-increment-decrement.cpp2"
 auto operator--(number_line_pre_decrement<0>& x,int) -> number_line_pre_decrement<0> { auto ret = x; ++x; return ret; }
 
+#line 54 "mixed-increment-decrement.cpp2"
 auto operator++(number_line_pre_increment<1>& x) -> number_line_pre_increment<1> const& { return x;  }
 #line 54 "mixed-increment-decrement.cpp2"
 auto operator++(number_line_pre_increment<1>& x,int) -> number_line_pre_increment<1> const { auto ret = x; ++x; return ret; }
+#line 55 "mixed-increment-decrement.cpp2"
 auto operator--(number_line_pre_decrement<1>& x) -> number_line_pre_decrement<1> const& { return x;  }
 #line 55 "mixed-increment-decrement.cpp2"
 auto operator--(number_line_pre_decrement<1>& x,int) -> number_line_pre_decrement<1> const { auto ret = x; ++x; return ret; }

regression-tests/test-results/mixed-initialization-safety-3-contract-violation.cpp

@@ -54,6 +54,7 @@ bool flip_a_coin() {
     print_decorated(std::move(x.value()));
 }
 
+#line 18 "mixed-initialization-safety-3-contract-violation.cpp2"
 auto fill(
     cpp2::out<std::string> x, 
     cpp2::in<std::string> value, 
@@ -66,5 +67,6 @@ auto fill(
     x.construct(CPP2_UFCS(substr)(value, 0, count));
 }
 
+#line 28 "mixed-initialization-safety-3-contract-violation.cpp2"
 auto print_decorated(auto const& x) -> void { std::cout << ">> [" << x << "]\n";  }
 

regression-tests/test-results/mixed-initialization-safety-3.cpp

@@ -48,6 +48,7 @@ auto print_decorated(auto const& x) -> void;
     print_decorated(std::move(x.value()));
 }
 
+#line 16 "mixed-initialization-safety-3.cpp2"
 auto fill(
     cpp2::out<std::string> x, 
     cpp2::in<std::string> value, 
@@ -60,6 +61,7 @@ auto fill(
     x.construct(CPP2_UFCS(substr)(value, 0, count));
 }
 
+#line 26 "mixed-initialization-safety-3.cpp2"
 auto print_decorated(auto const& x) -> void { std::cout << ">> [" << x << "]\n";  }
 
 #line 30 "mixed-initialization-safety-3.cpp2"

regression-tests/test-results/mixed-inspect-templates.cpp

@@ -42,6 +42,7 @@ struct my_type {};
     (); 
 }
 
+#line 18 "mixed-inspect-templates.cpp2"
 [[nodiscard]] auto fun2(auto const& v) -> std::string{
     if (cpp2::is<std::vector>(v)) {return "std::vector"; }
     if (cpp2::is<std::array>(v)) {return "std::array"; }
@@ -50,6 +51,7 @@ struct my_type {};
     return "unknown"; 
 }
 
+#line 26 "mixed-inspect-templates.cpp2"
 [[nodiscard]] auto main() -> int{
     std::vector<int> vec {1, 2, 3}; 
     std::array<int,4> arr {1, 2, 3, 4}; 

regression-tests/test-results/mixed-inspect-values.cpp

@@ -30,6 +30,7 @@ auto test(auto const& x) -> void;
 #line 5 "mixed-inspect-values.cpp2"
 [[nodiscard]] auto in_2_3(cpp2::in<int> x) -> bool { return cpp2::cmp_less_eq(2,x) && cpp2::cmp_less_eq(x,3);  }
 
+#line 7 "mixed-inspect-values.cpp2"
 [[nodiscard]] auto main() -> int{
     std::variant<double,std::string,double> v {}; 
     v = "rev dodgson";
@@ -54,6 +55,7 @@ auto test(auto const& x) -> void;
     test(3.14);
 }
 
+#line 31 "mixed-inspect-values.cpp2"
 auto test(auto const& x) -> void{
     auto forty_two {42}; 
     std::cout << [&] () -> std::string { auto&& _expr = x;

regression-tests/test-results/mixed-inspect-with-typeof-of-template-arg-list.cpp

@@ -35,6 +35,7 @@ auto calc() {
     (); 
 }
 
+#line 14 "mixed-inspect-with-typeof-of-template-arg-list.cpp2"
 [[nodiscard]] auto main() -> int{
     return fun(42); 
 }

regression-tests/test-results/mixed-lifetime-safety-and-null-contracts.cpp

@@ -46,6 +46,7 @@ auto try_pointer_stuff() -> void{
                 // to show -n
 }
 
+#line 21 "mixed-lifetime-safety-and-null-contracts.cpp2"
 auto call_my_framework(char const* msg) -> void{
     std::cout 
         << "sending error to my framework... [" 

regression-tests/test-results/mixed-lifetime-safety-pointer-init-4.cpp

@@ -50,6 +50,7 @@ bool flip_a_coin() {
     print_and_decorate(*cpp2::assert_not_null(std::move(p.value())));
 }
 
+#line 21 "mixed-lifetime-safety-pointer-init-4.cpp2"
 auto print_and_decorate(auto const& thing) -> void { 
     std::cout << ">> " << thing << "\n";  }
 

regression-tests/test-results/mixed-multiple-return-values.cpp

@@ -62,6 +62,7 @@ bool flip_a_coin() {
     return  { std::move(i.value()), std::move(s.value()) }; 
 }
 
+#line 22 "mixed-multiple-return-values.cpp2"
 auto do_print(cpp2::in<std::string> name, auto const& value) -> void { 
     std::cout << name << " is " << value << "\n";  }
 

regression-tests/test-results/mixed-out-destruction.cpp

@@ -58,12 +58,17 @@ int main() {
 
 #line 22 "mixed-out-destruction.cpp2"
 auto f00() -> void     {   C auto_22_28 {"f00"}; cpp2::deferred_init<X> x; f01(cpp2::out(&x));}
+#line 23 "mixed-out-destruction.cpp2"
 auto f01(cpp2::out<X> x) -> void{C auto_23_28 {"f01"}; x.construct();throw_1();}
 
 #line 27 "mixed-out-destruction.cpp2"
 auto f10() -> void     {   C auto_27_28 {"f10"}; cpp2::deferred_init<X> x; f11(cpp2::out(&x));}
+#line 28 "mixed-out-destruction.cpp2"
 auto f11(cpp2::out<X> x) -> void{C auto_28_28 {"f11"}; f12(cpp2::out(&x));}
+#line 29 "mixed-out-destruction.cpp2"
 auto f12(cpp2::out<X> x) -> void{C auto_29_28 {"f12"}; f13(cpp2::out(&x));throw_1();}
+#line 30 "mixed-out-destruction.cpp2"
 auto f13(cpp2::out<X> x) -> void{C auto_30_28 {"f13"}; f14(cpp2::out(&x));}
+#line 31 "mixed-out-destruction.cpp2"
 auto f14(cpp2::out<X> x) -> void{C auto_31_28 {"f14"}; x.construct();}
 

regression-tests/test-results/mixed-parameter-passing-generic-out.cpp

@@ -38,6 +38,7 @@ auto f(auto x_) -> void{
     x.construct(42);
 }
 
+#line 15 "mixed-parameter-passing-generic-out.cpp2"
 [[nodiscard]] auto main() -> int{
     cpp2::deferred_init<int> a; 
     f(cpp2::out(&a));

regression-tests/test-results/mixed-parameter-passing-with-forward.cpp

@@ -40,6 +40,7 @@ CPP2_REQUIRES (std::is_same_v<CPP2_TYPEOF(e), std::string>)
 #line 6 "mixed-parameter-passing-with-forward.cpp2"
 auto copy_from([[maybe_unused]] auto unnamed_param_1) -> void{}
 
+#line 8 "mixed-parameter-passing-with-forward.cpp2"
 auto parameter_styles(
     [[maybe_unused]] cpp2::in<std::string> unnamed_param_1, 
     std::string b, 
@@ -76,5 +77,6 @@ requires (std::is_same_v<CPP2_TYPEOF(e), std::string>)
 
 }
 
+#line 42 "mixed-parameter-passing-with-forward.cpp2"
 [[nodiscard]] auto main() -> int{}
 

regression-tests/test-results/mixed-parameter-passing.cpp

@@ -36,6 +36,7 @@ auto parameter_styles(
 #line 6 "mixed-parameter-passing.cpp2"
 auto copy_from([[maybe_unused]] auto unnamed_param_1) -> void{}
 
+#line 8 "mixed-parameter-passing.cpp2"
 auto parameter_styles(
     [[maybe_unused]] cpp2::in<std::string> unnamed_param_1, 
     std::string b, 
@@ -68,5 +69,6 @@ auto parameter_styles(
 
 }
 
+#line 40 "mixed-parameter-passing.cpp2"
 [[nodiscard]] auto main() -> int{}
 

regression-tests/test-results/mixed-postexpression-with-capture.cpp

@@ -53,6 +53,7 @@ struct make_strings_ret { std::string a; std::string b; };
 
 std::vector<int> vec {}; 
 
+#line 16 "mixed-postexpression-with-capture.cpp2"
 auto insert_at(cpp2::in<int> where, cpp2::in<int> val) -> void
 
 #line 19 "mixed-postexpression-with-capture.cpp2"
@@ -64,6 +65,7 @@ auto insert_at(cpp2::in<int> where, cpp2::in<int> val) -> void
     CPP2_UFCS(push_back)(vec, val);
 }
 
+#line 23 "mixed-postexpression-with-capture.cpp2"
 [[nodiscard]] auto make_string() -> make_string_ret
 
 {
@@ -74,6 +76,7 @@ auto insert_at(cpp2::in<int> where, cpp2::in<int> val) -> void
     ret += " and ";
 cpp2_finally_presuccess.run(); return std::move(ret); }
 
+#line 29 "mixed-postexpression-with-capture.cpp2"
 [[nodiscard]] auto make_strings() -> make_strings_ret
 
 #line 35 "mixed-postexpression-with-capture.cpp2"

regression-tests/test-results/mixed-postfix-expression-custom-formatting.cpp

@@ -27,6 +27,7 @@ auto call([[maybe_unused]] auto const& unnamed_param_1, [[maybe_unused]] auto co
 #line 2 "mixed-postfix-expression-custom-formatting.cpp2"
 auto call([[maybe_unused]] auto const& unnamed_param_1, [[maybe_unused]] auto const& unnamed_param_2, [[maybe_unused]] auto const& unnamed_param_3, [[maybe_unused]] auto const& unnamed_param_4, [[maybe_unused]] auto const& unnamed_param_5) -> void{}
 
+#line 4 "mixed-postfix-expression-custom-formatting.cpp2"
 [[nodiscard]] auto test(auto const& a) -> std::string{
     return call(a, 
         ++*cpp2::assert_not_null(CPP2_UFCS(b)(a, a.c)), "hello", /* polite
@@ -38,5 +39,6 @@ auto call([[maybe_unused]] auto const& unnamed_param_1, [[maybe_unused]] auto co
         ); 
 }
 
+#line 15 "mixed-postfix-expression-custom-formatting.cpp2"
 [[nodiscard]] auto main() -> int{}
 

regression-tests/test-results/mixed-type-safety-1.cpp

@@ -42,6 +42,7 @@ auto print(cpp2::in<std::string> msg, cpp2::in<bool> b) -> void;
 auto print(cpp2::in<std::string> msg, auto const& x) -> void { 
     std::cout << msg << x << "\n";  }
 
+#line 16 "mixed-type-safety-1.cpp2"
 auto print(cpp2::in<std::string> msg, cpp2::in<bool> b) -> void
 {
     cpp2::deferred_init<char const*> bmsg; 

regression-tests/test-results/pure2-bounds-safety-span.cpp

@@ -40,6 +40,7 @@ auto print_and_decorate(auto const& thing) -> void;
     }
 }
 
+#line 15 "pure2-bounds-safety-span.cpp2"
 auto print_and_decorate(auto const& thing) -> void { 
     std::cout << ">> " << thing << "\n";  }