diff --git a/Tests/VariableAnalysisSniff/fixtures/FunctionWithClosureFixture.php b/Tests/VariableAnalysisSniff/fixtures/FunctionWithClosureFixture.php
index 98445ee8..c595c2c9 100644
--- a/Tests/VariableAnalysisSniff/fixtures/FunctionWithClosureFixture.php
+++ b/Tests/VariableAnalysisSniff/fixtures/FunctionWithClosureFixture.php
@@ -82,3 +82,15 @@ function method_with_self_inside_closure() {
         echo static::$static_member;
     }
 }
+
+function function_with_type_argument_in_closure($items, $item_id) {
+    return array_filter($items, function (Taxed_Line_Item $line_item) use ($item_id) {
+        return $line_item->item_id === $item_id;
+    });
+}
+
+function function_with_fully_qualified_type_argument_in_closure($items, $item_id) {
+    return array_filter($items, function (\Taxed_Line_Item $line_item) use ($item_id) {
+        return $line_item->item_id === $item_id;
+    });
+}
diff --git a/VariableAnalysis/Lib/Helpers.php b/VariableAnalysis/Lib/Helpers.php
index 34cb52af..4ce3b247 100644
--- a/VariableAnalysis/Lib/Helpers.php
+++ b/VariableAnalysis/Lib/Helpers.php
@@ -120,6 +120,7 @@ public static function getFunctionIndexForFunctionArgument(File $phpcsFile, $sta
     $nonFunctionTokenTypes[] = T_COMMA;
     $nonFunctionTokenTypes[] = T_STRING;
     $nonFunctionTokenTypes[] = T_BITWISE_AND;
+    $nonFunctionTokenTypes[] = T_NS_SEPARATOR;
     $functionPtr = self::getIntOrNull($phpcsFile->findPrevious($nonFunctionTokenTypes, $stackPtr - 1, null, true, null, true));
     if (! is_int($functionPtr)) {
       return null;
diff --git a/VariableAnalysis/Sniffs/CodeAnalysis/VariableAnalysisSniff.php b/VariableAnalysis/Sniffs/CodeAnalysis/VariableAnalysisSniff.php
index 1f6a4aeb..4c50097a 100644
--- a/VariableAnalysis/Sniffs/CodeAnalysis/VariableAnalysisSniff.php
+++ b/VariableAnalysis/Sniffs/CodeAnalysis/VariableAnalysisSniff.php
@@ -587,11 +587,11 @@ protected function processVariableAsUseImportDefinition(File $phpcsFile, $stackP
 
     $endOfArgsPtr = $phpcsFile->findPrevious([T_CLOSE_PARENTHESIS], $stackPtr - 1, null);
     if (! is_int($endOfArgsPtr)) {
-      throw new \Exception("Arguments index not found for function use index {$stackPtr}");
+      throw new \Exception("Arguments index not found for function use index {$stackPtr} when processing variable {$varName}");
     }
     $functionPtr = Helpers::getFunctionIndexForFunctionArgument($phpcsFile, $endOfArgsPtr);
     if (! is_int($functionPtr)) {
-      throw new \Exception("Function index not found for function use index {$stackPtr}");
+      throw new \Exception("Function index not found for function use index {$stackPtr} when processing variable {$varName}");
     }
 
     // Use is both a read (in the enclosing scope) and a define (in the function scope)