Merge pull request #8914 from random-internet-cat/down-with-unique-ptr

Down with unique_ptr!

libyul/backends/wasm/WasmCodeTransform.cpp

@@ -29,6 +29,8 @@
 
 #include <liblangutil/Exceptions.h>
 
+#include <optional>
+
 using namespace std;
 using namespace solidity;
 using namespace solidity::yul;
@@ -125,7 +127,7 @@ wasm::Expression WasmCodeTransform::operator()(FunctionCall const& _call)
 					builtin->name.str().substr(4),
 					builtin->name.str(),
 					{},
-					builtin->returns.empty() ? nullptr : make_unique<string>(builtin->returns.front().str())
+					builtin->returns.empty() ? nullopt : make_optional<string>(builtin->returns.front().str())
 				};
 				for (auto const& param: builtin->parameters)
 					imp.paramTypes.emplace_back(param.str());