Add test for exceptions.

Author: Crell

Zend/tests/pipe_operator/exception_interruption.phpt

@@ -0,0 +1,37 @@
+--TEST--
+A pipe interrupted by an exception, to demonstrate correct order of execution.
+--FILE--
+<?php
+
+function foo()     { echo __FUNCTION__, PHP_EOL; return 1; }
+function bar()     { echo __FUNCTION__, PHP_EOL; return false; }
+function baz($in)  { echo __FUNCTION__, PHP_EOL; return $in; }
+function quux($in) { echo __FUNCTION__, PHP_EOL; throw new \Exception('Oops'); } // This is line 6.
+
+try {
+    $result = foo()
+        |> (bar() ? baz(...) : quux(...))
+        |> var_dump(...);
+}
+catch (Throwable $e) {
+    echo $e::class, ": ", $e->getMessage(), PHP_EOL;
+}
+
+try {
+    $result = foo()
+      |> (throw new Exception('Break'))
+      |> (bar() ? baz(...) : quux(...))
+      |> var_dump(...);
+}
+catch (Throwable $e) {
+    echo $e::class, ": ", $e->getMessage(), PHP_EOL;
+}
+
+?>
+--EXPECTF--
+foo
+bar
+quux
+Exception: Oops
+foo
+Exception: Break