diff --git a/tests/test-extension.t b/tests/test-extension.t
--- a/tests/test-extension.t
+++ b/tests/test-extension.t
@@ -574,25 +574,35 @@
   > NO_CHECK_EOF
 
 Examine module importing.
-
-  $ (PYTHONPATH=${PYTHONPATH}${PATHSEP}${TESTTMP}; hg --config extensions.absextroot=$TESTTMP/absextroot showabsolute)
-  LIB: this is extlibroot.lsub1.lsub2.used
-  LIB: this is extlibroot.lsub1.lsub2.called.func()
-  LIB: this is extlibroot.recursedown.abs.used
-  LIB: this is extlibroot.recursedown.legacy.used
-  LIB: this is extlibroot.shadowing.used
-  ABS: this is absextroot.xsub1.xsub2.used
-  ABS: this is absextroot.xsub1.xsub2.called.func()
+Python 3.5's lazy module importer varies in behavior from ours and the
+one in the standard library at 3.6+. This is not desirable. But it is
+a corner case in behavior and we don't expect many people to be running
+into it.
 
-  $ (PYTHONPATH=${PYTHONPATH}${PATHSEP}${TESTTMP}; hg --config extensions.absextroot=$TESTTMP/absextroot showrelative)
-  LIB: this is extlibroot.lsub1.lsub2.used
-  LIB: this is extlibroot.lsub1.lsub2.called.func()
-  LIB: this is extlibroot.recursedown.abs.used
-  LIB: this is extlibroot.recursedown.legacy.used
-  LIB: this is extlibroot.shadowing.used
-  REL: this is absextroot.xsub1.xsub2.used
-  REL: this is absextroot.xsub1.xsub2.called.func()
-  REL: this relimporter imports 'this is absextroot.relimportee'
+  $ (PYTHONPATH=${PYTHONPATH}${PATHSEP}${TESTTMP}; hg --config extensions.absextroot=$TESTTMP/absextroot showabsolute) || true
+  LIB: this is extlibroot.lsub1.lsub2.used (no-pyexact35 !)
+  LIB: this is extlibroot.lsub1.lsub2.called.func() (no-pyexact35 !)
+  LIB: this is extlibroot.recursedown.abs.used (no-pyexact35 !)
+  LIB: this is extlibroot.recursedown.legacy.used (no-pyexact35 !)
+  LIB: this is extlibroot.shadowing.used (no-pyexact35 !)
+  ABS: this is absextroot.xsub1.xsub2.used (no-pyexact35 !)
+  ABS: this is absextroot.xsub1.xsub2.called.func() (no-pyexact35 !)
+  *** failed to import extension absextroot from $TESTTMP/absextroot: extlibroot.lsub1.lsub2.unused is loaded unintentionally (pyexact35 !)
+  hg: unknown command 'showabsolute' (pyexact35 !)
+  (use 'hg help' for a list of commands) (pyexact35 !)
+
+  $ (PYTHONPATH=${PYTHONPATH}${PATHSEP}${TESTTMP}; hg --config extensions.absextroot=$TESTTMP/absextroot showrelative) || true
+  LIB: this is extlibroot.lsub1.lsub2.used (no-pyexact35 !)
+  LIB: this is extlibroot.lsub1.lsub2.called.func() (no-pyexact35 !)
+  LIB: this is extlibroot.recursedown.abs.used (no-pyexact35 !)
+  LIB: this is extlibroot.recursedown.legacy.used (no-pyexact35 !)
+  LIB: this is extlibroot.shadowing.used (no-pyexact35 !)
+  REL: this is absextroot.xsub1.xsub2.used (no-pyexact35 !)
+  REL: this is absextroot.xsub1.xsub2.called.func() (no-pyexact35 !)
+  REL: this relimporter imports 'this is absextroot.relimportee' (no-pyexact35 !)
+  *** failed to import extension absextroot from $TESTTMP/absextroot: extlibroot.lsub1.lsub2.unused is loaded unintentionally (pyexact35 !)
+  hg: unknown command 'showrelative' (pyexact35 !)
+  (did you mean shelve?) (pyexact35 !)
 
 Examine whether sub-module is imported relatively as expected.