Mark some TokenIterator methods as impure

Author: ondrejmirtes

src/Parser/TokenIterator.php

@@ -90,6 +90,7 @@ public function consumeTokenType(int $tokenType): void
 	}
 
 
+	/** @phpstan-impure */
 	public function tryConsumeTokenValue(string $tokenValue): bool
 	{
 		if ($this->tokens[$this->index][Lexer::VALUE_OFFSET] !== $tokenValue) {
@@ -106,6 +107,7 @@ public function tryConsumeTokenValue(string $tokenValue): bool
 	}
 
 
+	/** @phpstan-impure */
 	public function tryConsumeTokenType(int $tokenType): bool
 	{
 		if ($this->tokens[$this->index][Lexer::TYPE_OFFSET] !== $tokenType) {
@@ -132,6 +134,7 @@ public function getSkippedHorizontalWhiteSpaceIfAny(): string
 	}
 
 
+	/** @phpstan-impure */
 	public function joinUntil(int ...$tokenType): string
 	{
 		$s = '';
@@ -153,6 +156,7 @@ public function next(): void
 		$this->index++;
 	}
 
+	/** @phpstan-impure */
 	public function forwardToTheEnd(): void
 	{
 		$lastToken = count($this->tokens) - 1;