Fix fetching class constants on object instances

Author: ondrejmirtes

src/Analyser/MutatingScope.php

@@ -1877,6 +1877,7 @@ private function resolveType(Expr $node): Type
 			return new ErrorType();
 		} elseif ($node instanceof Node\Expr\ClassConstFetch && $node->name instanceof Node\Identifier) {
 			$constantName = $node->name->name;
+			$isObject = false;
 			if ($node->class instanceof Name) {
 				$constantClass = (string) $node->class;
 				$constantClassType = new ObjectType($constantClass);
@@ -1893,6 +1894,7 @@ private function resolveType(Expr $node): Type
 						}
 
 						$namesToResolve[] = 'static';
+						$isObject = true;
 					}
 				}
 				if (in_array(strtolower($constantClass), $namesToResolve, true)) {
@@ -1908,6 +1910,7 @@ private function resolveType(Expr $node): Type
 				}
 			} else {
 				$constantClassType = $this->getType($node->class);
+				$isObject = true;
 			}
 
 			$referencedClasses = TypeUtils::getDirectClassNames($constantClassType);
@@ -1936,8 +1939,7 @@ private function resolveType(Expr $node): Type
 				$constantReflection = $constantClassReflection->getConstant($constantName);
 				if (
 					$constantReflection instanceof ClassConstantReflection
-					&& $node->class instanceof Name
-					&& strtolower((string) $node->class) === 'static'
+					&& $isObject
 					&& !$constantClassReflection->isFinal()
 					&& !$constantReflection->hasPhpDocType()
 				) {

tests/PHPStan/Analyser/data/class-constant-types.php

@@ -19,12 +19,15 @@ public function doFoo()
 	{
 		assertType('1', self::NO_TYPE);
 		assertType('mixed', static::NO_TYPE);
+		assertType('mixed', $this::NO_TYPE);
 
 		assertType('string', self::TYPE);
 		assertType('string', static::TYPE);
+		assertType('string', $this::TYPE);
 
 		assertType('string', self::PRIVATE_TYPE);
 		assertType('string', static::PRIVATE_TYPE);
+		assertType('string', $this::PRIVATE_TYPE);
 	}
 
 }
@@ -40,9 +43,11 @@ public function doFoo()
 	{
 		assertType('string', self::TYPE);
 		assertType('string', static::TYPE);
+		assertType('string', $this::TYPE);
 
 		assertType('\'bar\'', self::PRIVATE_TYPE);
 		assertType('mixed', static::PRIVATE_TYPE);
+		assertType('mixed', $this::PRIVATE_TYPE);
 	}
 
 }
@@ -57,6 +62,7 @@ public function doFoo()
 	{
 		assertType('int', self::TYPE);
 		assertType('int', static::TYPE);
+		assertType('int', $this::TYPE);
 	}
 
 }
@@ -71,6 +77,7 @@ public function doFoo()
 	{
 		assertType('string', self::TYPE);
 		assertType('string', static::TYPE);
+		assertType('string', $this::TYPE);
 	}
 
 }