Fix repr syntax to match Python's

typon/trans/transpiler/phases/emit_cpp/class_.py

@@ -33,13 +33,13 @@ class ClassVisitor(NodeVisitor):
             yield "}"
         else:
             yield "void py_repr(std::ostream &s) const {"
-            yield "s << '{';"
+            yield f's << "{node.name}(";'
             for i, (name, memb) in enumerate(node.type.get_members().items()):
                 if i != 0:
                     yield 's << ", ";'
-                yield f's << "\\"{name}\\": ";'
+                yield f's << "{name}=";'
                 yield f"repr_to({name}, s);"
-            yield "s << '}';"
+            yield "s << ')';"
             yield "}"
 
         yield "void py_print(std::ostream &s) const {"