Rename function to match type variable

Author: jack-williams

tests/cases/compiler/narrowingByTypeofInSwitch.ts

@@ -230,10 +230,10 @@ function unknownNarrowing(x: unknown) {
 }
 
 function keyofNarrowing<S extends { [K in keyof S]: string }>(k: keyof S) {
-    function assertKeyofT(k1: keyof S) { }
+    function assertKeyofS(k1: keyof S) { }
     switch (typeof k) {
-        case 'number': assertNumber(k); assertKeyofT(k); return;
-        case 'symbol': assertSymbol(k); assertKeyofT(k); return;
-        case 'string': assertString(k); assertKeyofT(k); return;
+        case 'number': assertNumber(k); assertKeyofS(k); return;
+        case 'symbol': assertSymbol(k); assertKeyofS(k); return;
+        case 'string': assertString(k); assertKeyofS(k); return;
     }
 }