[PATCH 1/5] tests: prepare a test for automove

[Akim Demaille]

The 'Variants' tests are well suited to check support for move, and in
particular for the forthcoming automove feature.  But the tests were
written to show the best practice in C++98, using swap:

    list "," item { std::swap ($$, $1); $$.push_back ($3); }

This cannot work with std::move.  So, make this example simpler, based
on regular assignment instead of swap, which is a regression for
C++98 (as the new traces show), but will be an improvement for modern
C++ with automove.

* tests/c++.at (Variants): Stop using swap.
We don't generate a header file, so remove the 'require' code section.
Adjust expectations.
---
 tests/c++.at | 35 ++++++++++++++---------------------
 1 file changed, 14 insertions(+), 21 deletions(-)

diff --git a/tests/c++.at b/tests/c++.at
index c89b6e25..2193f88f 100644
--- a/tests/c++.at
+++ b/tests/c++.at
@@ -214,13 +214,6 @@ AT_DATA_GRAMMAR([list.y],
 ]m4_bpatsubst([$1], [\\n], [
 ])[
 
-%code requires // code for the .hh file
-{
-#include <vector>
-#include <string>
-typedef std::vector<std::string> strings_type;
-}
-
 %code top // code for the .cc file.
 {
 #include <cstdlib> // abort, getenv
@@ -295,12 +288,12 @@ result:
 
 list:
   item          { $$.push_back ($][1); }
-| list "," item { std::swap ($$, $][1); $$.push_back ($][3); }
-| list error    { std::swap ($$, $][1); }
+| list "," item { $$ = $][1; $$.push_back ($][3); }
+| list error    { $$ = $][1; }
 ;
 
 item:
-  TEXT          { std::swap ($$, $][1); }
+  TEXT          { $$ = $][1; }
 | NUMBER        { if ($][1 == 3) YYERROR; else $$ = to_string ($][1); }
 ;
 %%
@@ -369,26 +362,26 @@ AT_FULL_COMPILE([list])
 AT_PARSER_CHECK([./list], 0,
 [[(0, 1, 2, 4, 6)
 ]],
-[[Destroy: ""
+[[Destroy: "0"
 Destroy: "0"
 Destroy: 1
 Destroy: "1"
-Destroy: ()
-Destroy: ""
+Destroy: (0)
 Destroy: "2"
-Destroy: ()
+Destroy: "2"
+Destroy: (0, 1)
 Destroy: ""
 Destroy: 3
-Destroy: ()
-Destroy: ""
+Destroy: (0, 1, 2)
+Destroy: "4"
 Destroy: "4"
-Destroy: ()
-Destroy: ()
+Destroy: (0, 1, 2)
+Destroy: (0, 1, 2, 4)
 Destroy: 5
-Destroy: ()
-Destroy: ""
+Destroy: (0, 1, 2, 4)
+Destroy: "6"
 Destroy: "6"
-Destroy: ()
+Destroy: (0, 1, 2, 4)
 Destroy: (0, 1, 2, 4, 6)
 ]])
 ])
-- 
2.19.0