This is 0.02

[perl/modules/Sub-Nary.git] / lib / Sub / Nary.pm

diff --git a/lib/Sub/Nary.pm b/lib/Sub/Nary.pm
index 707a2e627ee25228b9bc20432c6237014c661d3e..4e244782a0e8650e0f5ca61a422f39b9a853cb6a 100644 (file)
--- a/lib/Sub/Nary.pm
+++ b/lib/Sub/Nary.pm
@@ -16,13 +16,13 @@ Sub::Nary - Try to count how many elements a subroutine can return in list conte
 
 =head1 VERSION
 
-Version 0.01
+Version 0.02
 
 =cut
 
 our $VERSION;
 BEGIN {
- $VERSION  = '0.01';
+ $VERSION  = '0.02';
 }
 
 =head1 SYNOPSIS
@@ -102,6 +102,10 @@ returns C<3> or C<4> arguments with probability C<1/2> ; and
 
 never returns C<1> argument but returns C<2> with probability C<1/2 * 1/2 = 1/4>, C<3> with probability C<1/2 * 1/2 + 1/2 * 1/2 = 1/2> and C<4> with probability C<1/4> too.
 
+=item * If a core function may return different numbers of scalars, each kind is considered equally possible.
+
+For example, C<stat> returns C<13> elements on success and C<0> on error. The according probability will then be C<< { 0 => 0.5, 13 => 0.5 } >>.
+
 =item * The C<list> state is absorbing in regard of all the other ones.
 
 This is just a pedantic way to say that "list + fixed length = list".
@@ -441,7 +445,17 @@ sub pp_rv2av {
  return (name($op) eq 'const') ? $self->expect_any($op) : 'list';
 }
 
-sub pp_aassign { $_[0]->expect_any($_[1]->first) }
+sub pp_aassign {
+ my ($self, $op) = @_;
+
+ $op = $op->first;
+
+ # Can't assign to return
+ my ($p, $r) = $self->expect_list($op->sibling);
+ return $p => 0 if not exists $p->{list};
+
+ $self->expect_any($op);
+}
 
 sub pp_leaveloop { $_[0]->expect_return($_[1]->first->sibling) }