lang: Port TestAstFunc2 to txtar format

This ports TestAstFunc2 from our home-grown content storage system to
the txtar package. Since a single file can be used to represent the
entire folder hierarchy, this makes it much easier to see and edit
tests.

misc/txtar-port.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+# port tests to txtar
+for f in */main.mcl; do
+	echo $f == $(dirname $f)
+	cat $f | cat - $(dirname $f).txtar | sponge $(dirname $f).txtar
+	echo '-- main.mcl --' | cat - $(dirname $f).txtar | sponge $(dirname $f).txtar
+done