Micro-optimizations

src/Parser/TokenIterator.php

@@ -210,6 +210,15 @@ public function rollback(): void
 	}
 
 
+	/** @internal */
+	public function copy(): self
+	{
+		$copy = new self($this->tokens, $this->index);
+		$copy->savePoints = $this->savePoints;
+		return $copy;
+	}
+
+
 	/**
 	 * @throws ParserException
 	 */

src/Parser/TypeParser.php

@@ -139,26 +139,29 @@ private function parseAtomic(TokenIterator $tokens): Ast\Type\TypeNode
 			$tokens->dropSavePoint(); // because of ConstFetchNode
 		}
 
-		$exception = new ParserException(
-			$tokens->currentTokenValue(),
-			$tokens->currentTokenType(),
-			$tokens->currentTokenOffset(),
-			Lexer::TOKEN_IDENTIFIER
-		);
+		$tokensCopy = $tokens->copy();
+		$exception = static function () use ($tokensCopy): ParserException {
+			return new ParserException(
+				$tokensCopy->currentTokenValue(),
+				$tokensCopy->currentTokenType(),
+				$tokensCopy->currentTokenOffset(),
+				Lexer::TOKEN_IDENTIFIER
+			);
+		};
 
 		if ($this->constExprParser === null) {
-			throw $exception;
+			throw $exception();
 		}
 
 		try {
 			$constExpr = $this->constExprParser->parse($tokens, true);
 			if ($constExpr instanceof Ast\ConstExpr\ConstExprArrayNode) {
-				throw $exception;
+				throw $exception();
 			}
 
 			return new Ast\Type\ConstTypeNode($constExpr);
 		} catch (LogicException $e) {
-			throw $exception;
+			throw $exception();
 		}
 	}