Only add clone on non-Copy types

Author: lucic71

cpp2rust/converter/converter_lib.cpp

@@ -814,4 +814,9 @@ ConstCastType GetConstCastType(clang::QualType to, clang::QualType from) {
   }
 }
 
+bool TypeIsCopyable(clang::QualType ty) {
+  return ty->isIntegerType() || ty->isFunctionPointerType() ||
+         ty->isFunctionType();
+}
+
 } // namespace cpp2rust

cpp2rust/converter/converter_lib.h

@@ -180,4 +180,6 @@ enum class ConstCastType {
 
 ConstCastType GetConstCastType(clang::QualType to, clang::QualType from);
 
+bool TypeIsCopyable(clang::QualType ty);
+
 } // namespace cpp2rust

cpp2rust/converter/models/converter_refcount.cpp

@@ -1130,6 +1130,9 @@ bool ConverterRefCount::VisitExplicitCastExpr(clang::ExplicitCastExpr *expr) {
   if (expr->getTypeAsWritten()->isVoidType()) {
     PushExprKind push(*this, ExprKind::Void);
     Convert(expr->getSubExpr());
+    if (!TypeIsCopyable(expr->getSubExpr()->getType())) {
+      StrCat(".clone()");
+    }
     return false;
   }
   switch (expr->getStmtClass()) {