From e6166a8b4074c76ac05c3f40d4ae6a4e3b267060 Mon Sep 17 00:00:00 2001
From: Pol Dellaiera <pol.dellaiera@protonmail.com>
Date: Mon, 10 Feb 2020 11:19:17 +0100
Subject: [PATCH 1/4] PHP 7.4 fix - Ensure the existence of the 'args' key.

---
 src/DocBlock/Tags/InvalidTag.php | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/DocBlock/Tags/InvalidTag.php b/src/DocBlock/Tags/InvalidTag.php
index a531c03..95f8221 100644
--- a/src/DocBlock/Tags/InvalidTag.php
+++ b/src/DocBlock/Tags/InvalidTag.php
@@ -104,6 +104,7 @@ final class InvalidTag implements Tag
         do {
             $trace = array_map(
                 static function (array $call) use ($flatten) : array {
+                    $call += ['args' => []];
                     array_walk_recursive($call['args'], $flatten);
 
                     return $call;

From adcffd685b30d3ed73ad1be7e1e58778ef5ea9a7 Mon Sep 17 00:00:00 2001
From: Pol Dellaiera <pol.dellaiera@protonmail.com>
Date: Mon, 10 Feb 2020 11:52:42 +0100
Subject: [PATCH 2/4] PHP 7.4 fix - Check if 'args' key exists, if not, use an
 empty array.

---
 src/DocBlock/Tags/InvalidTag.php | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/DocBlock/Tags/InvalidTag.php b/src/DocBlock/Tags/InvalidTag.php
index 95f8221..df674ef 100644
--- a/src/DocBlock/Tags/InvalidTag.php
+++ b/src/DocBlock/Tags/InvalidTag.php
@@ -104,8 +104,7 @@ final class InvalidTag implements Tag
         do {
             $trace = array_map(
                 static function (array $call) use ($flatten) : array {
-                    $call += ['args' => []];
-                    array_walk_recursive($call['args'], $flatten);
+                    array_walk_recursive($call['args'] ?? [], $flatten);
 
                     return $call;
                 },

From 1c6203a9f73e1fc09016fa16bcb0d4cbaabb1810 Mon Sep 17 00:00:00 2001
From: Pol Dellaiera <pol.dellaiera@protonmail.com>
Date: Mon, 10 Feb 2020 13:18:57 +0100
Subject: [PATCH 3/4] PHP 7.4 fix - Create a temporary variable to prevent
 Fatal error.

---
 src/DocBlock/Tags/InvalidTag.php | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/DocBlock/Tags/InvalidTag.php b/src/DocBlock/Tags/InvalidTag.php
index df674ef..d15818e 100644
--- a/src/DocBlock/Tags/InvalidTag.php
+++ b/src/DocBlock/Tags/InvalidTag.php
@@ -104,7 +104,9 @@ final class InvalidTag implements Tag
         do {
             $trace = array_map(
                 static function (array $call) use ($flatten) : array {
-                    array_walk_recursive($call['args'] ?? [], $flatten);
+                    $args = $call['args'] ?? [];
+
+                    array_walk_recursive($args, $flatten);
 
                     return $call;
                 },

From 91307e3009402a6d3e2197b9109c1ffda52b5e3c Mon Sep 17 00:00:00 2001
From: Pol Dellaiera <pol.dellaiera@protonmail.com>
Date: Mon, 10 Feb 2020 21:04:24 +0100
Subject: [PATCH 4/4] Fix previous erroneous assignment.

---
 src/DocBlock/Tags/InvalidTag.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/DocBlock/Tags/InvalidTag.php b/src/DocBlock/Tags/InvalidTag.php
index d15818e..c37ea69 100644
--- a/src/DocBlock/Tags/InvalidTag.php
+++ b/src/DocBlock/Tags/InvalidTag.php
@@ -104,9 +104,9 @@ final class InvalidTag implements Tag
         do {
             $trace = array_map(
                 static function (array $call) use ($flatten) : array {
-                    $args = $call['args'] ?? [];
+                    $call['args'] = $call['args'] ?? [];
 
-                    array_walk_recursive($args, $flatten);
+                    array_walk_recursive($call['args'], $flatten);
 
                     return $call;
                 },