run unit tests

Author: coke

doc/Language/5to6-nutshell.pod6

@@ -1529,7 +1529,7 @@ C<is export> role on the relevant subs and I<all> subs with this role are
 then exported.  Hence, the following module C<Bar> exports the subs C<foo>
 and C<bar> but not C<baz>:
 
-=begin code :skip-test<unit>
+=begin code :solo
 unit module Bar;
 
 sub foo($a) is export { say "foo $a" }
@@ -1630,7 +1630,7 @@ When you specify C<is export> in a sub declaration, you are in fact adding
 this subroutine to the C<:DEFAULT> export group.  But you can add a subroutine
 to another group, or to multiple groups:
 
-=for code :skip-test
+=for code :solo
 unit module Bar;
 sub foo() is export { }                   # added by default to :DEFAULT
 sub bar() is export(:FNORBL) { }          # added to the FNORBL export group

doc/Language/create-cli.pod6

@@ -243,7 +243,7 @@ X<|declarator,unit (MAIN)>
 If the entire program body resides within C<MAIN>, you can use the C<unit>
 declarator as follows (adapting an earlier example):
 
-=begin code :skip-test<unit>
+=begin code :solo
 unit sub MAIN(
   Str   $file where *.IO.f = 'file.dat',
   Int  :$length = 24,

doc/Language/modules.pod6

@@ -489,15 +489,13 @@ Be careful I<not> to put C<sub EXPORT> after L«C<unit> declarator|/syntax/unit
 If you do so, it'll become just a sub inside your package, rather than the special
 export sub:
 
-=begin code :skip-test<unit module can't work here>
+=for code :skip-test<bad example>
     unit module Bar;
     sub EXPORT { %(Foo => &say) } # WRONG!!! Sub is scoped wrong
 
-    # ---------
-
+=for code :solo
     sub EXPORT { %(Foo => &say) } # RIGHT!!! Sub is outside the module
     unit module Bar;
-=end code
 
 =head2 Finding modules
 

doc/Language/rb-nutshell.pod6

@@ -1064,10 +1064,8 @@ C<is export> role on the relevant subs and I<all> subs with this role are
 then exported. Hence, the following module C<Bar> exports the subs C<foo>
 and C<bar> but not C<baz>:
 
-=for code :skip-test<can't unit here>
+=for code :solo
 unit module Bar; # remainder of the file is in module Bar { ... }
-
-=for code
 sub foo($a) is export { say "foo $a" }
 sub bar($b) is export { say "bar $b" }
 sub baz($z) { say "baz $z" }