41     public $configLookup;  variable in Antlr\\Antlr4\\Runtime\\Atn\\ATNConfigSet
98         $this->configLookup = new Set(new class implements Equivalence {
141         if ($this->readOnly || $this->configLookup === null) {
153         if ($this->configLookup === null) {
158         $existing = $this->configLookup->getOrAdd($config);
257         if ($this->readOnly || $this->configLookup === null) {
261         if ($this->configLookup->isEmpty()) {
325         if ($this->configLookup === null) {
329         return $this->configLookup->contains($item);
350         $this->configLookup = new Set();
363             $this->configLookup = null; // can't mod, no need for lookup cache