From @szabgab

Running on Rakudo * 2013.02 on Windows I tried to install HTML​::Template
first panda complained that there was no "prove" and then gave a huge
error message.
After installing DWIM Perl to have prove, panda went on and ran the
test. Some of the tests
failed that caused panda to show the big and nasty output.

running panda --notests install HTML​::Template worked
after that I could read the documentation with p6doc HTML​::Template

See the output below​:

C​:\>panda install HTML​::Template
==> Fetching HTML​::Template
==> Building HTML​::Template
Compiling lib/Text/Escape.pm
Compiling lib/HTML/Template/Grammar.pm
Compiling lib/HTML/Template.pm
==> Testing HTML​::Template
'prove' is not recognized as an internal or external command,
operable program or batch file.
Mu()
test stage failed for HTML​::Template​: Tests failed
current instr.​: '' pc 7735 ((file unknown)​:2891) (c​:\rakudo\bin\panda​:120)
called from Sub 'rethrow' pc 331236 (src\gen\CORE.setting.pir​:148576)
(src\gen\CORE.setting​:9250)
called from Sub '' pc 2376
(c​:/rakudo/lib/parrot/4.10.0/languages/perl6/lib/Panda.pir​:1010)
(c​:/rakudo/lib/parrot/4.10.0/languages/perl6/lib/P
anda.pm​:101)
....

After installing a Perl 5 with a "prove" command it was a bit better,
but it still blew up​:

C​:\work\Perl6-Maven>panda install HTML​::Template
==> Fetching HTML​::Template
==> Building HTML​::Template
Compiling lib/Text/Escape.pm
Compiling lib/HTML/Template/Grammar.pm
Compiling lib/HTML/Template.pm
==> Testing HTML​::Template
t/01.t ............... 10/32 Param lname is a undef in block at
lib/HTML/Template.pm​:119

t/01.t ............... Failed 2/32 subtests
t/08-include.t ....... Failed 4/4 subtests
t/09-loop-control.t .. ok

Test Summary Report

t/01.t (Wstat​: 0 Tests​: 32 Failed​: 2)
  Failed tests​: 25, 32
t/08-include.t (Wstat​: 0 Tests​: 4 Failed​: 4)
  Failed tests​: 1-4
Files=3, Tests=38, 4 wallclock secs ( 0.17 usr + 0.05 sys = 0.22 CPU)
Result​: FAIL
Mu()
test stage failed for HTML​::Template​: Tests failed
current instr.​: '' pc 7735 ((file unknown)​:2891) (c​:\rakudo\bin\panda​:120)
called from Sub 'rethrow' pc 331236 (src\gen\CORE.setting.pir​:148576)
(src\gen\CORE.setting​:9250)
called from Sub '' pc 2376
(c​:/rakudo/lib/parrot/4.10.0/languages/perl6/lib/Panda.pir​:1010)
(c​:/rakudo/lib/parrot/4.10.0/languages/perl6/lib/P
anda.pm​:101)
called from Sub 'throw' pc 331167 (src\gen\CORE.setting.pir​:148535)
(src\gen\CORE.setting​:9246)
called from Sub 'die' pc 198
(c​:/rakudo/lib/parrot/4.10.0/languages/perl6/lib/Panda/Tester.pir​:131)
(c​:/rakudo/lib/parrot/4.10.0/languages/per
l6/lib/Panda/Tester.pm​:6)
called from Sub '' pc 603
(c​:/rakudo/lib/parrot/4.10.0/languages/perl6/lib/Panda/Tester.pir​:292)
(c​:/rakudo/lib/parrot/4.10.0/languages/perl6/
lib/Panda/Tester.pm​:16)
called from Sub 'withp6lib' pc 771
(c​:/rakudo/lib/parrot/4.10.0/languages/perl6/lib/Panda/Common.pir​:345)
(c​:/rakudo/lib/parrot/4.10.0/languag
es/perl6/lib/Panda/Common.pm​:31)
called from Sub '' pc 487
(c​:/rakudo/lib/parrot/4.10.0/languages/perl6/lib/Panda/Tester.pir​:255)
(c​:/rakudo/lib/parrot/4.10.0/languages/perl6/
lib/Panda/Tester.pm​:14)
called from Sub '' pc 425
(c​:/rakudo/lib/parrot/4.10.0/languages/perl6/lib/Panda/Tester.pir​:225)
(c​:/rakudo/lib/parrot/4.10.0/languages/perl6/
lib/Panda/Tester.pm​:13)
called from Sub 'indir' pc 389
(c​:/rakudo/lib/parrot/4.10.0/languages/perl6/lib/Panda/Common.pir​:224)
(c​:/rakudo/lib/parrot/4.10.0/languages/p
erl6/lib/Panda/Common.pm​:13)
called from Sub 'test' pc 302
(c​:/rakudo/lib/parrot/4.10.0/languages/perl6/lib/Panda/Tester.pir​:178)
(c​:/rakudo/lib/parrot/4.10.0/languages/pe
rl6/lib/Panda/Tester.pm​:12)
called from Sub 'test-helper' pc 1753
(c​:/rakudo/lib/parrot/4.10.0/languages/perl6/lib/Pies.pir​:940)
(c​:/rakudo/lib/parrot/4.10.0/languages/pe
rl6/lib/Pies.pm​:54)
called from Sub 'resolve-helper' pc 2728
(c​:/rakudo/lib/parrot/4.10.0/languages/perl6/lib/Pies.pir​:1305)
(c​:/rakudo/lib/parrot/4.10.0/language
s/perl6/lib/Pies.pm​:88)
called from Sub 'resolve' pc 3349
(c​:/rakudo/lib/parrot/4.10.0/languages/perl6/lib/Pies.pir​:1519)
(c​:/rakudo/lib/parrot/4.10.0/languages/perl6

....