Replace errorType return with Debug fail in checkExpressionWorker

Author: weswigham

src/compiler/checker.ts

@@ -254,6 +254,7 @@ import {
     getDeclarationsOfKind,
     getDeclaredExpandoInitializer,
     getDecorators,
+    getDefaultLibFileName,
     getDirectoryPath,
     getEffectiveBaseTypeNode,
     getEffectiveConstraintOfTypeParameter,
@@ -37955,8 +37956,9 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
                 return checkJsxAttributes(node as JsxAttributes, checkMode);
             case SyntaxKind.JsxOpeningElement:
                 Debug.fail("Shouldn't ever directly check a JsxOpeningElement");
+            default:
+                return Debug.failBadSyntaxKind(node, "Unhandled expression node kind in checkExpressionWorker");
         }
-        return errorType;
     }
 
     // DECLARATION AND STATEMENT TYPE CHECKING