fixed #449, added test

tests/test9.in

@@ -0,0 +1,25 @@
+# Test events. 
+
+# This pattern caused a crash; github issue #449
+
+set -g var before
+
+function test1 --on-event test
+    set -g var $var:test1
+    functions -e test2
+end
+
+function test2 --on-event test
+    # this should not run, as test2 gets removed before it has a chance of running
+    set -g var $var:test2a
+end
+emit test
+
+echo $var
+
+
+function test3 --on-event test3
+    echo received event test3 with args: $argv
+end
+
+emit test3 foo bar

tests/test9.out

@@ -0,0 +1,2 @@
+before:test1
+received event test3 with args:

tests/test9.status

@@ -0,0 +1 @@
+0