Add conevrsion operators under constructors

Author: lucic71

cpp2rust/converter/rules/rule_keys.cpp

@@ -98,7 +98,11 @@ std::optional<ExprKey> getConstructorKey(const clang::Decl *parent) {
   return Constructor{parent};
 }
 
-ExprKey getMemberKey(const clang::Decl *parent, clang::DeclarationName name) {
+std::optional<ExprKey> getMemberKey(const clang::Decl *parent,
+                                    clang::DeclarationName name) {
+  if (name.getNameKind() == clang::DeclarationName::CXXConversionFunctionName) {
+    return getConstructorKey(parent);
+  }
   if (!parent) {
     return Unqualified{name};
   }

cpp2rust/converter/rules/rule_keys.h

@@ -22,6 +22,7 @@ struct Member {
   bool operator==(const Member &) const = default;
 };
 
+// Constructors and conversion operators.
 struct Constructor {
   const clang::Decl *parent;