Add regression tests

tests/cases/conformance/types/nonPrimitive/nonPrimitiveAndTypeVariables.ts

@@ -0,0 +1,14 @@
+// @strict: true
+
+// Repros from #23800
+
+type A<T, V> = { [P in keyof T]: T[P] extends V ? 1 : 0; };
+type B<T, V> = { [P in keyof T]: T[P] extends V | object ? 1 : 0; };
+
+type a = A<{ a: 0 | 1 }, 0>; // { a: 0; }
+type b = B<{ a: 0 | 1 }, 0>; // { a: 0; }
+
+function foo<T, U>(x: T) {
+    let a: object = x;  // Error
+    let b: U | object = x;  // Error
+}