Add bad test case

Author: andrewbranch

tests/cases/conformance/ambient/ambientDeclarationsPatterns_merging3.ts

@@ -0,0 +1,12 @@
+// @filename: types.ts
+declare module "*.foo" {
+  export interface OhNo { star: string }
+}
+
+// @filename: test.ts
+declare module "a.foo" {
+  export interface OhNo { a: string }
+}
+import { OhNo } from "b.foo"
+declare let ohno: OhNo;
+ohno.a // oh no