Deparse: detect hh changes properly

The hack to check whether the hint hash has changed doesn’t work.  One
actually has to iterate through the hash.  Since declare_hinthash does
that already, just call it.

The change to declare_hinthash to return an empty list instead of ''
is one of those theoretical speed-ups.  It results in one less state-
ment and two fewer method calls in its caller.

1 files changed, 8 insertions, 0 deletions

diff --git a/dist/B-Deparse/t/deparse.t b/dist/B-Deparse/t/deparse.t
index d47498cf59..a4284ef33f 100644
--- a/dist/B-Deparse/t/deparse.t
+++ b/dist/B-Deparse/t/deparse.t
@@ -809,3 +809,11 @@ BEGIN { $^H{'foo'} = undef; }
 }
 BEGIN { $^H{q[']} = '('; }
 print $_;
+####
+# hint hash changes that serialise the same way with sort %hh
+BEGIN { $^H{'a'} = 'b'; }
+{
+ BEGIN { $^H{'b'} = 'a'; delete $^H{'a'}; }
+ print $_;
+}
+print $_;