Add regression test

ahejlsberg · ahejlsberg · commit db9c202b64d8 · 2018-08-21T16:17:14.000-07:00
diff --git a/tests/cases/compiler/infiniteConstraints.ts b/tests/cases/compiler/infiniteConstraints.ts
@@ -31,3 +31,8 @@ const noError = ensureNoDuplicates({main: value("test"), alternate: value("test2
 const shouldBeNoError = ensureNoDuplicates({main: value("test")});
 
 const shouldBeError = ensureNoDuplicates({main: value("dup"), alternate: value("dup")});
+
+// Repro from #26448
+
+type Cond<T> = T extends number ? number : never;
+declare function function1<T extends {[K in keyof T]: Cond<T[K]>}>(): T[keyof T]["foo"];
