Introduce _ps custom literal for PyStr

rt/include/python/builtins/str.hpp

@@ -35,6 +35,10 @@ public:
   }
 };
 
+inline constexpr PyStr operator""_ps(const char *s, size_t len) noexcept {
+  return PyStr(s, len);
+}
+
 PyStr PyBytes::decode(const std::string &encoding) const {
   return PyStr(this->begin(), this->end());
 }

trans/transpiler/phases/emit_cpp/expr.py

@@ -61,7 +61,7 @@ class ExpressionVisitor(NodeVisitor):
     def visit_Constant(self, node: ast.Constant) -> Iterable[str]:
         if isinstance(node.value, str):
             # TODO: escape sequences
-            yield f"\"{repr(node.value)[1:-1]}\"s"
+            yield f"\"{repr(node.value)[1:-1]}\"_ps"
         elif isinstance(node.value, bool):
             yield str(node.value).lower()
         elif isinstance(node.value, int):