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diff --git a/test/Alias/srcdir.py b/test/Alias/srcdir.py
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+++ b/test/Alias/srcdir.py
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+#!/usr/bin/env python
+#
+# __COPYRIGHT__
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#
+
+__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
+
+"""
+Verify that an Alias for a BuildDir()'s source directory works as
+expected.
+
+This tests for a 0.96.93 bug uncovered by the LilyPond project's build.
+
+The specific problem is that, in 0.96.93, the simple act of trying to
+disambiguate a target file in the BuildDir() would call srcnode(), which
+would create a "phantom" Node for the target in the *source* directory:
+
+        +-minimal
+          +-python
+            +-foo               <= this doesn't belong!
+            +-foo.py
+            +-out-scons
+              +-foo             <= this is all right
+              +-foo.py
+
+As part of deciding if the 'minimal' Alias is up-to-date, the 'python'
+source directory would get scanned for files, including the "phantom"
+'python/foo' target Node.  Since this didn't exist, the build would die:
+
+    scons: *** Source `python/foo' not found, needed by target `minimal'.  Stop.
+
+The specific 0.96.94 solution was to make the Node.FS.Entry.disambiguate()
+smarter about looking on disk.  Future versions may solve this in other
+ways as the architecture evolves, of course, but this will still make
+for good test case regardless.
+"""
+
+import TestSCons
+
+test = TestSCons.TestSCons()
+
+test.subdir('python')
+
+test.write('SConstruct', """\
+import os.path
+
+env = Environment ()
+
+def at_copy_ext (target, source, env):
+    n = str (source[0])
+    s = open (n, 'rb').read ()
+    e = os.path.splitext (n)[1]
+    t = str (target[0]) + e
+    open (t, 'wb').write (s)
+
+AT_COPY_EXT = Builder (action = at_copy_ext, src_suffix=['.py', '.sh',])
+env.Append (BUILDERS = {'AT_COPY_EXT': AT_COPY_EXT})
+
+env.Alias ('minimal', ['python'])
+
+Export ('env')
+
+b = 'python/out-scons'
+
+env.BuildDir(b, 'python', duplicate=0)
+
+SConscript(b + '/SConscript')
+""")
+
+test.write(['python', 'SConscript'], """\
+Import ('env')
+env.AT_COPY_EXT('foo.py')
+""")
+
+test.write(['python', 'foo.py'], 'python/foo.py\n')
+
+test.run('minimal')
+
+test.must_match(['python', 'out-scons', 'foo.py'], "python/foo.py\n")
+
+test.pass_test()