Add failing test

Author: andrewbranch

tests/cases/conformance/types/tuple/readonlyArraysAndTuples.ts

@@ -28,3 +28,10 @@ function f1(ma: string[], ra: readonly string[], mt: [string, string], rt: reado
     rt = ra;  // Error
     rt = mt;
 }
+
+declare var v: readonly[number, number, ...number[]];
+v[0] = 1; // Error
+v[1] = 1; // Error
+v[2] = 1; // Error
+v[0 + 1] = 1; // Error
+v[0 + 2] = 1; // Error