Do not report first class callables

Author: ondrejmirtes

src/Rules/Functions/CallToFunctionStatementWithNoDiscardRule.php

@@ -34,6 +34,10 @@ public function processNode(Node $node, Scope $scope): array
 			return [];
 		}
 
+		if ($node->expr->isFirstClassCallable()) {
+			return [];
+		}
+
 		$funcCall = $node->expr;
 		if ($funcCall->name instanceof Node\Name) {
 			if (!$this->reflectionProvider->hasFunction($funcCall->name, $scope)) {

src/Rules/Methods/CallToMethodStatementWithNoDiscardRule.php

@@ -37,6 +37,10 @@ public function processNode(Node $node, Scope $scope): array
 			return [];
 		}
 
+		if ($node->expr->isFirstClassCallable()) {
+			return [];
+		}
+
 		$funcCall = $node->expr;
 		if (!$funcCall->name instanceof Node\Identifier) {
 			return [];

src/Rules/Methods/CallToStaticMethodStatementWithNoDiscardRule.php

@@ -40,6 +40,10 @@ public function processNode(Node $node, Scope $scope): array
 			return [];
 		}
 
+		if ($node->expr->isFirstClassCallable()) {
+			return [];
+		}
+
 		$funcCall = $node->expr;
 		if (!$funcCall->name instanceof Node\Identifier) {
 			return [];

tests/PHPStan/Rules/Functions/data/function-call-statement-result-discarded.php

@@ -43,3 +43,5 @@ function differentCase(): array {
 $b = $arrowWithNoDiscard();
 
 $arrowWithNoDiscard();
+
+withSideEffects(...);

tests/PHPStan/Rules/Methods/data/method-call-statement-result-discarded.php

@@ -28,3 +28,5 @@ public function differentCase(): array {
 }
 
 $o->differentCase();
+
+$o->instanceMethod(...);

tests/PHPStan/Rules/Methods/data/static-method-call-statement-result-discarded.php

@@ -25,3 +25,5 @@ public static function differentCase(): array {
 }
 
 ClassWithStaticSideEffects::differentCase();
+
+ClassWithStaticSideEffects::staticMethod(...);