Fix scope namespace when entering trait

src/Analyser/MutatingScope.php

@@ -116,8 +116,11 @@
 use function array_keys;
 use function array_map;
 use function array_pop;
+use function array_slice;
 use function count;
+use function explode;
 use function get_class;
+use function implode;
 use function in_array;
 use function is_string;
 use function ltrim;
@@ -2486,12 +2489,18 @@ public function enterClass(ClassReflection $classReflection): self
 
 	public function enterTrait(ClassReflection $traitReflection): self
 	{
+		$namespace = null;
+		$traitName = $traitReflection->getName();
+		$traitNameParts = explode('\\', $traitName);
+		if (count($traitNameParts) > 1) {
+			$namespace = implode('\\', array_slice($traitNameParts, 0, -1));
+		}
 		return $this->scopeFactory->create(
 			$this->context->enterTrait($traitReflection),
 			$this->isDeclareStrictTypes(),
 			$this->constantTypes,
 			$this->getFunction(),
-			$this->getNamespace(),
+			$namespace,
 			$this->getVariableTypes(),
 			$this->moreSpecificTypes,
 			[],

tests/PHPStan/Rules/Functions/CallToNonExistentFunctionRuleTest.php

@@ -157,4 +157,9 @@ public function testBug3576(): void
 		]);
 	}
 
+	public function testBug7952(): void
+	{
+		$this->analyse([__DIR__ . '/data/bug-7952.php'], []);
+	}
+
 }

tests/PHPStan/Rules/Functions/data/bug-7952.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace Bug7952A {
+
+	function clean(): void
+	{
+		echo 'cleaned';
+	}
+
+	trait FooTrait
+	{
+		public function doClean(): void
+		{
+			clean();
+		}
+	}
+
+}
+
+namespace Bug7952A\Sub {
+
+	use Bug7952A\FooTrait;
+
+	class FooClass
+	{
+		use FooTrait;
+	}
+
+}