Turn on checkMissingClosureNativeReturnTypehintRule

README.md

@@ -27,6 +27,7 @@
 * Correct case for inherited and implemented method names.
 * Contravariance for parameter types and covariance for return types in inherited methods (also known as Liskov substitution principle - LSP)
 * Check LSP even for static methods
+* Check missing typehint in anonymous function when a native one could be added
 
 Additional rules are coming in subsequent releases!
 

rules.neon

@@ -6,6 +6,7 @@ parameters:
 	checkAlwaysTrueStrictComparison: true
 	checkExplicitMixedMissingReturn: true
 	checkFunctionNameCase: true
+	checkMissingClosureNativeReturnTypehintRule: true
 	reportMaybesInMethodSignatures: true
 	reportStaticMethodSignatures: true
 

tests/Levels/data/foreach.php

@@ -1,6 +1,6 @@
 <?php
 
-function () {
+function (): void {
 	foreach ([1, 2, 3] as $val) {
 		if (rand(0, 1) === 0) {
 			break;