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Hello,

I've run into this strange behaviour when playing with trying
to make functions return different values from the number of
parameters they were called with. If you test [at]_, and that you
return from a do { ... } block where a variable is localized,
the return value is undef if you don't add an else statement.

Looks like some parsing bug, but not that I'm good enough to have
any real clue about it.

Regards,

Vincent Pit

#################################################################
Test case: (line 1 is #!)

#!/usr/bin/perl

use strict;
use warnings;

sub foo {
 if (@_) {
  return do { my $dummy; 1; };
 } else {
  return 0;
 }
}

# let's just remove the else

sub bar {
 if (@_) {
  return do { my $dummy; 1; };
 }
 return 0;
}

print foo().' '.foo('baz')."\n"; # that was expected
print bar().' '.bar('baz')."\n"; # undef

#################################################################
Expected output:

0 1
0 1

#################################################################
Actual output:

0 1
Use of uninitialized value in concatenation (.) or string at ./bug.pl 
+line 24.
0

#################################################################
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