Nested match expression tests

Closes GH-12433

Zend/tests/match/046.phpt

@@ -0,0 +1,41 @@
+--TEST--
+Nested match expressions
+--FILE--
+<?php
+
+// Nested in return expression:
+$b = 'b';
+echo match($b) {
+    'a' => 1,
+    'b' => match (1) {
+        strpos('ab', $b) => 100,
+        default => 15
+    },
+    default => 4
+};
+
+echo "\n";
+
+// Nested in condition expression:
+$c = 'c';
+echo match($c) {
+    'foo' => 'bar',
+    match ($c) { default => 'c' } => 300
+};
+
+echo "\n";
+
+// Nested in one of many condition expressions:
+$d = 'd';
+echo match($d) {
+    'foo' => 'bar',
+    match ($d) { default => 'd' },
+    match ($d) { default => 'e' } => 500
+};
+
+
+?>
+--EXPECT--
+100
+300
+500

Zend/tests/match/047.phpt

@@ -0,0 +1,14 @@
+--TEST--
+Match expression inside subject expression
+--FILE--
+<?php
+
+echo match (match ('b') { default => 'b' }) {
+    'a' => 100,
+    'b' => 200,
+    'c' => 300
+};
+
+?>
+--EXPECT--
+200