Fix "print" pretty-printing

Precedence was previously ignored.

lib/PhpParser/PrettyPrinter/Standard.php

@@ -316,6 +316,10 @@ class Standard extends PrettyPrinterAbstract
         return $this->pPrefixOp('Expr_YieldFrom', 'yield from ', $node->expr);
     }
 
+    public function pExpr_Print(Expr\Print_ $node) {
+        return $this->pPrefixOp('Expr_Print', 'print ', $node->expr);
+    }
+
     // Casts
 
     public function pExpr_Cast_Int(Cast\Int_ $node) {
@@ -376,10 +380,6 @@ class Standard extends PrettyPrinterAbstract
         return 'isset(' . $this->pCommaSeparated($node->vars) . ')';
     }
 
-    public function pExpr_Print(Expr\Print_ $node) {
-        return 'print ' . $this->p($node->expr);
-    }
-
     public function pExpr_Eval(Expr\Eval_ $node) {
         return 'eval(' . $this->p($node->expr) . ')';
     }

lib/PhpParser/PrettyPrinterAbstract.php

@@ -67,6 +67,7 @@ abstract class PrettyPrinterAbstract
         'Expr_AssignOp_ShiftRight'     => array(160,  1),
         'Expr_AssignOp_Pow'            => array(160,  1),
         'Expr_YieldFrom'               => array(165,  1),
+        'Expr_Print'                   => array(168,  1),
         'Expr_BinaryOp_LogicalAnd'     => array(170, -1),
         'Expr_BinaryOp_LogicalXor'     => array(180, -1),
         'Expr_BinaryOp_LogicalOr'      => array(190, -1),

test/code/prettyPrinter/parentheses.test

@@ -36,6 +36,8 @@ $a ** $b ** $c;
 yield from $a and yield from $b;
 yield from ($a and yield from $b);
 
+print ($a and print $b);
+
 // The following will currently add unnecessary parentheses, because the pretty printer is not aware that assignment
 // and incdec only work on variables.
 !$a = $b;
@@ -67,6 +69,7 @@ $a ** $b ** $c;
 -1 ** 2;
 yield from $a and yield from $b;
 yield from ($a and yield from $b);
+print ($a and print $b);
 // The following will currently add unnecessary parentheses, because the pretty printer is not aware that assignment
 // and incdec only work on variables.
 !($a = $b);