Add support for unary operations in typing

trans/transpiler/phases/typing/expr.py

@@ -209,7 +209,13 @@ class ScoperExprVisitor(ScoperVisitor):
         return self.make_dunder([left, *args], "getitem")
 
     def visit_UnaryOp(self, node: ast.UnaryOp) -> BaseType:
-        raise NotImplementedError(node)
+        val = self.visit(node.operand)
+        if isinstance(node.op, ast.Not):
+            return TY_BOOL
+        try:
+            return self.make_dunder([val], DUNDER[type(node.op)])
+        except IncompatibleTypesError as e:
+            raise IncompatibleTypesError(f"{e} in `{ast.unparse(node)}`")
 
     def visit_IfExp(self, node: ast.IfExp) -> BaseType:
         self.visit(node.test)