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When I attempt to query ls -functions I get this fatal error. I put in signatureformatter.php
use Drush\Log\LogLevel;
but nothing changes.
How can I solve this error?

drush drush-psysh --verbose
Declaration of DrushPsysh\DrushCommand::execute() should be compatible with Symfony\Component\Console\Command\Command::execute(Symfony\Component\Console\Input\InputInterface $input, [notice]
Symfony\Component\Console\Output\OutputInterface $output) DrushCommand.php:226
Undefined index: value DrushCommand.php:165
...
PHP Fatal error: Cannot instantiate interface PhpParser\Parser in /home/d8/.drush/drush_psysh/vendor/psy/psysh/src/Psy/CodeCleaner.php on line 56
Drush command terminated abnormally due to an unrecoverable error. [error]
Error: Cannot instantiate interface PhpParser\Parser in /home/d8/.drush/drush_psysh/vendor/psy/psysh/src/Psy/CodeCleaner.php, line 56

» drush psysh
PHP Fatal error: Cannot instantiate interface PhpParser\Parser in /home/myuser/.drush/drush_psysh/vendor/psy/psysh/src/Psy/CodeCleaner.php on line 56
PHP Stack trace:
PHP 1. {main}() /home/myuser/.composer/vendor/drush/drush/drush.php:0
PHP 2. drush_main() /home/myuser/.composer/vendor/drush/drush/drush.php:12
PHP 3. Drush\Boot\BaseBoot->bootstrap_and_dispatch() /home/myuser/.composer/vendor/drush/drush/includes/preflight.inc:66
PHP 4. drush_dispatch($command = array ('callback' => 'drush_command', 'description' => 'Drupal REPL via psysh', 'aliases' => array (0 => 'shell', 1 => 'repl', 2 => 'psysh'), 'examples' => array ('drush shell' => 'Invokes the Drupal REPL'), 'command' => 'drush-psysh', 'command-hook' => 'drush-psysh', 'invoke hooks' => TRUE, 'callback arguments' => array (), 'commandfile' => 'drush_psysh', 'path' => '/home/myuser/.drush/drush_psysh', 'engines' => array (), 'primary function' => 'drush_psysh_callback', 'sections' => array ('examples' => 'Examples', 'arguments' => 'Arguments', 'options' => 'Options'), 'arguments' => array (), 'required-arguments' => FALSE, 'options' => array (), 'sub-options' => array (), 'allow-additional-options' => FALSE, 'global-options' => array (), 'core' => array (), 'scope' => 'site', 'drush dependencies' => array (), 'handle-remote-commands' => FALSE, 'remote-tty' => FALSE, 'strict-option-handling' => FALSE, 'tilde-expansion' => TRUE, 'bootstrap_errors' => array (), 'topics' => array (), 'hidden' => FALSE, 'category' => 'drush_psysh', 'add-options-to-arguments' => FALSE, 'consolidation-output-formatters' => FALSE, 'annotated-command-callback' => '', 'annotations' => array (), 'drupal dependencies' => array (), 'bootstrap' => 6, 'is_alias' => TRUE, 'argument-description' => array ()), $arguments = uninitialized) /home/myuser/.composer/vendor/drush/drush/lib/Drush/Boot/BaseBoot.php:67
PHP 5. call_user_func_array:{/home/myuser/.composer/vendor/drush/drush/includes/command.inc:192}('drush_command', array ()) /home/myuser/.composer/vendor/drush/drush/includes/command.inc:192
PHP 6. drush_command() /home/myuser/.composer/vendor/drush/drush/includes/command.inc:192
PHP 7. _drush_invoke_hooks($command = array ('callback' => 'drush_command', 'description' => 'Drupal REPL via psysh', 'aliases' => array (0 => 'shell', 1 => 'repl', 2 => 'psysh'), 'examples' => array ('drush shell' => 'Invokes the Drupal REPL'), 'command' => 'drush-psysh', 'command-hook' => 'drush-psysh', 'invoke hooks' => TRUE, 'callback arguments' => array (), 'commandfile' => 'drush_psysh', 'path' => '/home/myuser/.drush/drush_psysh', 'engines' => array (), 'primary function' => 'drush_psysh_callback', 'sections' => array ('examples' => 'Examples', 'arguments' => 'Arguments', 'options' => 'Options'), 'arguments' => array (), 'required-arguments' => FALSE, 'options' => array (), 'sub-options' => array (), 'allow-additional-options' => FALSE, 'global-options' => array (), 'core' => array (), 'scope' => 'site', 'drush dependencies' => array (), 'handle-remote-commands' => FALSE, 'remote-tty' => FALSE, 'strict-option-handling' => FALSE, 'tilde-expansion' => TRUE, 'bootstrap_errors' => array (), 'topics' => array (), 'hidden' => FALSE, 'category' => 'drush_psysh', 'add-options-to-arguments' => FALSE, 'consolidation-output-formatters' => FALSE, 'annotated-command-callback' => '', 'annotations' => array (), 'drupal dependencies' => array (), 'bootstrap' => 6, 'is_alias' => TRUE, 'argument-description' => array ()), $args = array ()) /home/myuser/.composer/vendor/drush/drush/includes/command.inc:224
PHP 8. call_user_func_array:{/home/myuser/.composer/vendor/drush/drush/includes/command.inc:373}('drush_psysh_callback', array ()) /home/myuser/.composer/vendor/drush/drush/includes/command.inc:373
PHP 9. drush_psysh_callback() /home/myuser/.composer/vendor/drush/drush/includes/command.inc:373
PHP 10. Psy\Shell->__construct($config = uninitialized) /home/myuser/.drush/drush_psysh/drush_psysh.drush.inc:62
PHP 11. Psy\Configuration->getCodeCleaner() /home/myuser/.drush/drush_psysh/vendor/psy/psysh/src/Psy/Shell.php:74
PHP 12. Psy\CodeCleaner->__construct($parser = uninitialized, $printer = uninitialized, $traverser = uninitialized) /home/myuser/.drush/drush_psysh/vendor/psy/psysh/src/Psy/Configuration.php:706
Drush command terminated abnormally due to an unrecoverable error. [error]
Error: Cannot instantiate interface PhpParser\Parser in /home/myuser/.drush/drush_psysh/vendor/psy/psysh/src/Psy/CodeCleaner.php, line 56

tried to run cc

was told
sh: /usr/share/pear/drush/drush.php: Permission denied

cc all
get's me the following:

PHP Catchable fatal error: Argument 1 passed to DrushPsysh\DrushCommand::execute() must be an instance of DrushPsysh\InputInterface, instance of Symfony\Component\Console\Input\StringInput given, called in /home/btopro/.drush/drush-psysh/vendor/symfony/console/Symfony/Component/Console/Command/Command.php on line 241 and defined in /home/btopro/.drush/drush-psysh/src/DrushCommand.php on line 73

Catchable fatal error: Argument 1 passed to DrushPsysh\DrushCommand::execute() must be an instance of DrushPsysh\InputInterface, instance of Symfony\Component\Console\Input\StringInput given, called in /home/btopro/.drush/drush-psysh/vendor/symfony/console/Symfony/Component/Console/Command/Command.php on line 241 and defined in /home/btopro/.drush/drush-psysh/src/DrushCommand.php on line 73
Drush command terminated abnormally due to an unrecoverable error. [error]
Error: Argument 1 passed to DrushPsysh\DrushCommand::execute() must be an instance of
DrushPsysh\InputInterface, instance of Symfony\Component\Console\Input\StringInput given, called in
/home/btopro/.drush/drush-psysh/vendor/symfony/console/Symfony/Component/Console/Command/Command.php
on line 241 and defined in /home/btopro/.drush/drush-psysh/src/DrushCommand.php, line 73

It would be nice to have drush-psysh released on drupal.org. This will enable easy installation of drush-psysh with the pm-download command. Which is cleaner than cloning a git repo into ~/.drush.

Hi,
I installed drush 8.1.12 on my windows 10 machine. I made some modifications to drush.launcher, in order to execute drush commands in a psysh session. So I started typing drush php.l It works and I can execute drupal functions and drush commands. But, when I attempt to list all functions with ls --functions, I receive a fatal error: undefined class constant in signatureformatter.php, line 253.
I have an independant psysh and it works fine.
Now, I don't know psysh source code, so I don't know that I must modify in order to resolve this error. Can help?

When I followed the instructions on my local server, no issue. On a staging box when I run
drush @myAlias repl
I get the following error (it prints 3x in a row, same error over and over)

Psy Shell v0.1.0-dev (PHP 5.3.3 — cli) by Justin Hileman
PHP Fatal error: Call to undefined function Psy\ExecutionLoop\posix_getpid() in /home/btopro/.drush/drush-psysh/vendor/psy/psysh/src/Psy/ExecutionLoop/ForkingLoop.php on line 119

Fatal error: Call to undefined function Psy\ExecutionLoop\posix_getpid() in /home/btopro/.drush/drush-psysh/vendor/psy/psysh/src/Psy/ExecutionLoop/ForkingLoop.php on line 119
Drush command terminated abnormally due to an unrecoverable error. [error]
Error: Call to undefined function Psy\ExecutionLoop\posix_getpid() in
/home/btopro/.drush/drush-psysh/vendor/psy/psysh/src/Psy/ExecutionLoop/ForkingLoop.php, line 119

Is there a minimum php requirement to run this?