add error message to assert

tyralla · tyralla · commit 121d8e1e6467 · 2024-12-02T06:27:01.000+01:00
diff --git a/mypy/join.py b/mypy/join.py
@@ -612,7 +612,7 @@ def visit_tuple_type(self, t: TupleType) -> ProperType:
             fallback = self.instance_joiner.join_instances(
                 mypy.typeops.tuple_fallback(self.s), mypy.typeops.tuple_fallback(t)
             )
-            assert isinstance(fallback, Instance)
+            assert isinstance(fallback, Instance), f"s = {self.s}, t = {t}, f = {fallback}"
             items = self.join_tuples(self.s, t)
             if items is not None:
                 return TupleType(items, fallback)

Original file line number	Diff line number	Diff line change
`@@ -612,7 +612,7 @@ def visit_tuple_type(self, t: TupleType) -> ProperType:`
`612`	`612`	`fallback = self.instance_joiner.join_instances(`
`613`	`613`	`mypy.typeops.tuple_fallback(self.s), mypy.typeops.tuple_fallback(t)`
`614`	`614`	`)`
`615`		`- assert isinstance(fallback, Instance)`
	`615`	`+ assert isinstance(fallback, Instance), f"s = {self.s}, t = {t}, f = {fallback}"`
`616`	`616`	`items = self.join_tuples(self.s, t)`
`617`	`617`	`if items is not None:`
`618`	`618`	`return TupleType(items, fallback)`