fix(cpp1): emit converting assignment from converting constructor

regression-tests/pure2-bugfix-for-explicit-converting-assignment.cpp2

@@ -0,0 +1,10 @@
+quantity: type = {
+  value: int = ();
+  operator=: (out this, val: int) = { value = val; }
+}
+
+main: () = {
+  x := quantity(0);
+  static_assert(!std::is_assignable_v<decltype((x)), int>);
+  _ = x;
+}

regression-tests/pure2-defaulted-comparisons-and-final-types.cpp2

@@ -3,7 +3,7 @@ widget: final type =
 {
     v: int;
 
-    operator=: (out this, value: int) = { v = value; }
+    operator=: (implicit out this, value: int) = { v = value; }
 
     operator==: (this, that) -> bool;
 

regression-tests/pure2-types-basics.cpp2

@@ -10,7 +10,7 @@ myclass : type = {
         print();
     }
 
-    operator=: (out this, s: std::string) = {
+    operator=: (implicit out this, s: std::string) = {
         this.data = 99;
         this.more = s;
         std::cout << "myclass: explicit from string\n";

regression-tests/pure2-types-smf-and-that-1-provide-everything.cpp2

@@ -19,7 +19,7 @@ myclass : type = {
         std::cout << "assign - move        ";
     }
 
-    operator=: (out this, x: std::string) = {
+    operator=: (implicit out this, x: std::string) = {
         name = x;
         std::cout << "ctor - from string   ";
     }

regression-tests/pure2-types-smf-and-that-2-provide-mvconstruct-and-cpassign.cpp2

@@ -19,7 +19,7 @@ myclass : type = {
     //     std::cout << "assign - move        ";
     // }
 
-    operator=: (out this, x: std::string) = {
+    operator=: (implicit out this, x: std::string) = {
         name = x;
         std::cout << "ctor - from string   ";
     }

regression-tests/pure2-types-smf-and-that-3-provide-mvconstruct-and-mvassign.cpp2

@@ -19,7 +19,7 @@ myclass : type = {
         std::cout << "assign - move        ";
     }
 
-    operator=: (out this, x: std::string) = {
+    operator=: (implicit out this, x: std::string) = {
         name = x;
         std::cout << "ctor - from string   ";
     }

regression-tests/pure2-types-smf-and-that-4-provide-cpassign-and-mvassign.cpp2

@@ -19,7 +19,7 @@ myclass : type = {
         std::cout << "assign - move        ";
     }
 
-    operator=: (out this, x: std::string) = {
+    operator=: (implicit out this, x: std::string) = {
         name = x;
         std::cout << "ctor - from string   ";
     }

regression-tests/pure2-types-smf-and-that-5-provide-nothing-but-general-case.cpp2

@@ -19,7 +19,7 @@ myclass : type = {
     //     std::cout << "assign - move        ";
     // }
 
-    operator=: (out this, x: std::string) = {
+    operator=: (implicit out this, x: std::string) = {
         name = x;
         std::cout << "ctor - from string   ";
     }

regression-tests/test-results/pure2-bugfix-for-explicit-converting-assignment.cpp

@@ -0,0 +1,43 @@
+
+#define CPP2_USE_MODULES         Yes
+
+//=== Cpp2 type declarations ====================================================
+
+
+#include "cpp2util.h"
+
+#line 1 "pure2-bugfix-for-explicit-converting-assignment.cpp2"
+class quantity;
+
+
+//=== Cpp2 type definitions and function declarations ===========================
+
+#line 1 "pure2-bugfix-for-explicit-converting-assignment.cpp2"
+class quantity {
+  private: int value {}; 
+  public: explicit quantity(cpp2::in<int> val);
+
+  public: quantity(quantity const&) = delete; /* No 'that' constructor, suppress copy */
+  public: auto operator=(quantity const&) -> void = delete;
+#line 4 "pure2-bugfix-for-explicit-converting-assignment.cpp2"
+};
+
+auto main() -> int;
+
+
+//=== Cpp2 function definitions =================================================
+
+
+#line 3 "pure2-bugfix-for-explicit-converting-assignment.cpp2"
+  quantity::quantity(cpp2::in<int> val)
+                                      : value{ val }
+#line 3 "pure2-bugfix-for-explicit-converting-assignment.cpp2"
+  {}
+
+#line 6 "pure2-bugfix-for-explicit-converting-assignment.cpp2"
+auto main() -> int{
+  auto x {quantity(0)}; 
+  static_assert(!(std::is_assignable_v<decltype((x)),int>));
+  (void) std::move(x);
+}
+

regression-tests/test-results/pure2-bugfix-for-explicit-converting-assignment.cpp2.output

@@ -0,0 +1,2 @@
+pure2-bugfix-for-explicit-converting-assignment.cpp2... ok (all Cpp2, passes safety checks)
+

regression-tests/test-results/pure2-defaulted-comparisons-and-final-types.cpp

@@ -19,7 +19,7 @@ class widget final
  {
     private: int v; 
 
-    public: explicit widget(cpp2::in<int> value);
+    public: widget(cpp2::in<int> value);
 #line 6 "pure2-defaulted-comparisons-and-final-types.cpp2"
     public: auto operator=(cpp2::in<int> value) -> widget& ;
 
@@ -40,13 +40,13 @@ auto main() -> int;
 
 #line 6 "pure2-defaulted-comparisons-and-final-types.cpp2"
     widget::widget(cpp2::in<int> value)
-                                          : v{ value }
+                                                   : v{ value }
 #line 6 "pure2-defaulted-comparisons-and-final-types.cpp2"
     {}
 #line 6 "pure2-defaulted-comparisons-and-final-types.cpp2"
     auto widget::operator=(cpp2::in<int> value) -> widget& {
-                                          v = value;
-                                          return *this;
+                                                   v = value;
+                                                   return *this;
 #line 6 "pure2-defaulted-comparisons-and-final-types.cpp2"
     }
 

regression-tests/test-results/pure2-types-basics.cpp

@@ -31,7 +31,7 @@ class myclass {
 
 
 #line 13 "pure2-types-basics.cpp2"
-    public: explicit myclass(cpp2::in<std::string> s);
+    public: myclass(cpp2::in<std::string> s);
 
 #line 13 "pure2-types-basics.cpp2"
     public: auto operator=(cpp2::in<std::string> s) -> myclass& ;

regression-tests/test-results/pure2-types-order-independence-and-nesting.cpp

@@ -45,9 +45,6 @@ class X {
     //  Note: A constructor with an 'out' parameter
     public: explicit X(cpp2::out<Y> y);
 
-#line 10 "pure2-types-order-independence-and-nesting.cpp2"
-    public: auto operator=(cpp2::out<Y> y) -> X& ;
-
 
 #line 34 "pure2-types-order-independence-and-nesting.cpp2"
     //  X::exx member function description here
@@ -66,8 +63,6 @@ class Y {
     private: X* px; 
 
     public: explicit Y(X* x);
-#line 49 "pure2-types-order-independence-and-nesting.cpp2"
-    public: auto operator=(X* x) -> Y& ;
 
     public: auto why(cpp2::in<int> count) const -> void;
 
@@ -139,16 +134,6 @@ namespace N {
         //  then do anything else the constructor wants to do
         std::cout << "made a safely initialized cycle\n";
     }
-#line 10 "pure2-types-order-independence-and-nesting.cpp2"
-    auto X::operator=(cpp2::out<Y> y) -> X& {
-        y.construct(&(*this));
-        py = &y.value();
-
-#line 31 "pure2-types-order-independence-and-nesting.cpp2"
-        std::cout << "made a safely initialized cycle\n";
-        return *this;
-#line 32 "pure2-types-order-independence-and-nesting.cpp2"
-    }
 
 #line 35 "pure2-types-order-independence-and-nesting.cpp2"
     auto X::exx(cpp2::in<int> count) const -> void{
@@ -164,12 +149,6 @@ namespace N {
                                    : px{ x }
 #line 49 "pure2-types-order-independence-and-nesting.cpp2"
      {  }
-#line 49 "pure2-types-order-independence-and-nesting.cpp2"
-    auto Y::operator=(X* x) -> Y&  { 
-                                   px = x;
-                                   return *this;
-#line 49 "pure2-types-order-independence-and-nesting.cpp2"
-     }
 
     auto Y::why(cpp2::in<int> count) const -> void { 
         CPP2_UFCS(exx, (*cpp2::assert_not_null(px)), count + 1);  }// use X object from Y

regression-tests/test-results/pure2-types-ordering-via-meta-functions.cpp

@@ -30,8 +30,6 @@ class mystruct;
 class my_integer {
     private: int v; 
     public: explicit my_integer(cpp2::in<int> val);
-#line 4 "pure2-types-ordering-via-meta-functions.cpp2"
-    public: auto operator=(cpp2::in<int> val) -> my_integer& ;
 
 public: [[nodiscard]] auto operator<=>(my_integer const& that) const -> std::strong_ordering = default;
 
@@ -43,8 +41,6 @@ public: [[nodiscard]] auto operator<=>(my_integer const& that) const -> std::str
 class case_insensitive_string {
     private: std::string v; // case insensitive
     public: explicit case_insensitive_string(cpp2::in<std::string> val);
-#line 9 "pure2-types-ordering-via-meta-functions.cpp2"
-    public: auto operator=(cpp2::in<std::string> val) -> case_insensitive_string& ;
 
 public: [[nodiscard]] auto operator<=>(case_insensitive_string const& that) const -> std::weak_ordering = default;
 
@@ -56,8 +52,6 @@ public: [[nodiscard]] auto operator<=>(case_insensitive_string const& that) cons
 class person_in_family_tree {
     private: int dummy_data; 
     public: explicit person_in_family_tree(cpp2::in<int> parents);
-#line 14 "pure2-types-ordering-via-meta-functions.cpp2"
-    public: auto operator=(cpp2::in<int> parents) -> person_in_family_tree& ;
 
 public: [[nodiscard]] auto operator<=>(person_in_family_tree const& that) const -> std::partial_ordering = default;
 
@@ -81,38 +75,20 @@ auto main() -> int;
                                         : v{ val }
 #line 4 "pure2-types-ordering-via-meta-functions.cpp2"
     {}
-#line 4 "pure2-types-ordering-via-meta-functions.cpp2"
-    auto my_integer::operator=(cpp2::in<int> val) -> my_integer& {
-                                        v = val;
-                                        return *this;
-#line 4 "pure2-types-ordering-via-meta-functions.cpp2"
-    }
 
 
 #line 9 "pure2-types-ordering-via-meta-functions.cpp2"
     case_insensitive_string::case_insensitive_string(cpp2::in<std::string> val)
                                                 : v{ val }
 #line 9 "pure2-types-ordering-via-meta-functions.cpp2"
     {}
-#line 9 "pure2-types-ordering-via-meta-functions.cpp2"
-    auto case_insensitive_string::operator=(cpp2::in<std::string> val) -> case_insensitive_string& {
-                                                v = val;
-                                                return *this;
-#line 9 "pure2-types-ordering-via-meta-functions.cpp2"
-    }
 
 
 #line 14 "pure2-types-ordering-via-meta-functions.cpp2"
     person_in_family_tree::person_in_family_tree(cpp2::in<int> parents)
                                             : dummy_data{ parents }
 #line 14 "pure2-types-ordering-via-meta-functions.cpp2"
     {}
-#line 14 "pure2-types-ordering-via-meta-functions.cpp2"
-    auto person_in_family_tree::operator=(cpp2::in<int> parents) -> person_in_family_tree& {
-                                            dummy_data = parents;
-                                            return *this;
-#line 14 "pure2-types-ordering-via-meta-functions.cpp2"
-    }
 
 
 #line 21 "pure2-types-ordering-via-meta-functions.cpp2"

regression-tests/test-results/pure2-types-smf-and-that-1-provide-everything.cpp

@@ -33,7 +33,7 @@ class myclass {
 
 
 #line 22 "pure2-types-smf-and-that-1-provide-everything.cpp2"
-    public: explicit myclass(cpp2::in<std::string> x);
+    public: myclass(cpp2::in<std::string> x);
 
 #line 22 "pure2-types-smf-and-that-1-provide-everything.cpp2"
     public: auto operator=(cpp2::in<std::string> x) -> myclass& ;

regression-tests/test-results/pure2-types-smf-and-that-2-provide-mvconstruct-and-cpassign.cpp

@@ -36,7 +36,7 @@ class myclass {
     //     std::cout << "assign - move        ";
     // }
 
-    public: explicit myclass(cpp2::in<std::string> x);
+    public: myclass(cpp2::in<std::string> x);
 
 #line 22 "pure2-types-smf-and-that-2-provide-mvconstruct-and-cpassign.cpp2"
     public: auto operator=(cpp2::in<std::string> x) -> myclass& ;

regression-tests/test-results/pure2-types-smf-and-that-3-provide-mvconstruct-and-mvassign.cpp

@@ -37,7 +37,7 @@ class myclass {
 
 
 #line 22 "pure2-types-smf-and-that-3-provide-mvconstruct-and-mvassign.cpp2"
-    public: explicit myclass(cpp2::in<std::string> x);
+    public: myclass(cpp2::in<std::string> x);
 
 #line 22 "pure2-types-smf-and-that-3-provide-mvconstruct-and-mvassign.cpp2"
     public: auto operator=(cpp2::in<std::string> x) -> myclass& ;

regression-tests/test-results/pure2-types-smf-and-that-4-provide-cpassign-and-mvassign.cpp

@@ -37,7 +37,7 @@ class myclass {
 
 
 #line 22 "pure2-types-smf-and-that-4-provide-cpassign-and-mvassign.cpp2"
-    public: explicit myclass(cpp2::in<std::string> x);
+    public: myclass(cpp2::in<std::string> x);
 
 #line 22 "pure2-types-smf-and-that-4-provide-cpassign-and-mvassign.cpp2"
     public: auto operator=(cpp2::in<std::string> x) -> myclass& ;

regression-tests/test-results/pure2-types-smf-and-that-5-provide-nothing-but-general-case.cpp

@@ -44,7 +44,7 @@ class myclass {
     //     std::cout << "assign - move        ";
     // }
 
-    public: explicit myclass(cpp2::in<std::string> x);
+    public: myclass(cpp2::in<std::string> x);
 
 #line 22 "pure2-types-smf-and-that-5-provide-nothing-but-general-case.cpp2"
     public: auto operator=(cpp2::in<std::string> x) -> myclass& ;

regression-tests/test-results/pure2-types-value-types-via-meta-functions.cpp

@@ -26,8 +26,6 @@ class p_widget;
 class widget {
     private: int val {0}; 
     public: explicit widget(cpp2::in<int> i);
-#line 4 "pure2-types-value-types-via-meta-functions.cpp2"
-    public: auto operator=(cpp2::in<int> i) -> widget& ;
 
 public: [[nodiscard]] auto operator<=>(widget const& that) const -> std::strong_ordering = default;
 public: widget(widget const& that);
@@ -42,8 +40,6 @@ public: explicit widget();
 class w_widget {
     private: int val {0}; 
     public: explicit w_widget(cpp2::in<int> i);
-#line 9 "pure2-types-value-types-via-meta-functions.cpp2"
-    public: auto operator=(cpp2::in<int> i) -> w_widget& ;
 
 public: [[nodiscard]] auto operator<=>(w_widget const& that) const -> std::weak_ordering = default;
 public: w_widget(w_widget const& that);
@@ -58,8 +54,6 @@ public: explicit w_widget();
 class p_widget {
     private: int val {0}; 
     public: explicit p_widget(cpp2::in<int> i);
-#line 14 "pure2-types-value-types-via-meta-functions.cpp2"
-    public: auto operator=(cpp2::in<int> i) -> p_widget& ;
 
 public: [[nodiscard]] auto operator<=>(p_widget const& that) const -> std::partial_ordering = default;
 public: p_widget(p_widget const& that);
@@ -86,12 +80,6 @@ template<typename T> auto test() -> void;
                                       : val{ i }
 #line 4 "pure2-types-value-types-via-meta-functions.cpp2"
     {}
-#line 4 "pure2-types-value-types-via-meta-functions.cpp2"
-    auto widget::operator=(cpp2::in<int> i) -> widget& {
-                                      val = i;
-                                      return *this;
-#line 4 "pure2-types-value-types-via-meta-functions.cpp2"
-    }
 
 
     widget::widget(widget const& that)
@@ -111,12 +99,6 @@ widget::widget(){}
                                       : val{ i }
 #line 9 "pure2-types-value-types-via-meta-functions.cpp2"
     {}
-#line 9 "pure2-types-value-types-via-meta-functions.cpp2"
-    auto w_widget::operator=(cpp2::in<int> i) -> w_widget& {
-                                      val = i;
-                                      return *this;
-#line 9 "pure2-types-value-types-via-meta-functions.cpp2"
-    }
 
 
     w_widget::w_widget(w_widget const& that)
@@ -136,12 +118,6 @@ w_widget::w_widget(){}
                                       : val{ i }
 #line 14 "pure2-types-value-types-via-meta-functions.cpp2"
     {}
-#line 14 "pure2-types-value-types-via-meta-functions.cpp2"
-    auto p_widget::operator=(cpp2::in<int> i) -> p_widget& {
-                                      val = i;
-                                      return *this;
-#line 14 "pure2-types-value-types-via-meta-functions.cpp2"
-    }
 
 
     p_widget::p_widget(p_widget const& that)

source/cppfront.cpp

@@ -5464,9 +5464,10 @@ class cppfront
                                 && !current_functions.back().declared_that_functions.inout_this_in_that
                                 )
                             ||
-                            //  A3) This is '(out   this, something-other-than-that)'
+                            //  A3) This is '(implicit out this, something-other-than-that)'
                             (
                                 n.is_constructor()
+                                && n.is_function_with_implicit_this()
                                 && !n.is_constructor_with_that()
                                 )
                             )