Right off the bat, the docs are unclear. Other than which reference? The pad's?

And then there's the issue that my $lex; produces a lexical var, but isn't one itself. Does that matter?

Control:

>type test.pl && perl -MO=Concise,-exec test.pl 2>&1 | find "proto"
sub with_proto()  { 4 }
sub without_proto { 4 }

with_proto();
without_proto();

                                 <---- Note absence of "with_proto"
5  <#> gv[*without_proto] s      <---- Not constant
[download]

Tests:

>type test.pl && perl -MO=Concise,-exec test.pl 2>&1 | find "proto"
sub with_proto()  { my $lex }
sub without_proto { my $lex }

with_proto();
without_proto();

4  <#> gv[*with_proto] s         <---- Not constant
8  <#> gv[*without_proto] s      <---- Not constant


>type test.pl && perl -MO=Concise,-exec test.pl 2>&1 | find "proto"
my $lex = 4;
sub with_proto()  { $lex }
sub without_proto { $lex }

with_proto();
without_proto();

8  <#> gv[*with_proto] s         <---- Not constant
c  <#> gv[*without_proto] s      <---- Not constant


>type test.pl && perl -MO=Concise,-exec test.pl 2>&1 | find "proto"
{ my $lex = 4; sub with_proto()  { $lex } }
{ my $lex = 4; sub without_proto { $lex } }

with_proto();
without_proto();

i  <#> gv[*with_proto] s         <---- Not constant
m  <#> gv[*without_proto] s      <---- Not constant
[download]

Bah, let's try references.

>type test.pl && perl -MO=Concise,-exec test.pl 2>&1 | find "proto"
sub with_proto()  { \my $lex }
sub without_proto { \my $lex }

with_proto();
without_proto();

4  <#> gv[*with_proto] s         <---- Not constant
8  <#> gv[*without_proto] s      <---- Not constant


>type test.pl && perl -MO=Concise,-exec test.pl 2>&1 | find "proto"
my $lex = 4;
sub with_proto()  { \$lex }
sub without_proto { \$lex }

with_proto();
without_proto();

8  <#> gv[*with_proto] s         <---- Not constant
c  <#> gv[*without_proto] s      <---- Not constant


>type test.pl && perl -MO=Concise,-exec test.pl 2>&1 | find "proto"
{ my $lex = 4; sub with_proto()  { \$lex } }
{ my $lex = 4; sub without_proto { \$lex } }

with_proto();
without_proto();

i  <#> gv[*with_proto] s         <---- Not constant
m  <#> gv[*without_proto] s      <---- Not constant
[download]

lvalue?

>type test.pl && perl -MO=Concise,-exec test.pl 2>&1 | find "proto"
sub with_proto()  :lvalue { my $lex }
sub without_proto :lvalue { my $lex }

with_proto();
without_proto();

4  <#> gv[*with_proto] s
8  <#> gv[*without_proto] s


>type test.pl && perl -MO=Concise,-exec test.pl 2>&1 | find "proto"
my $lex = 4;
sub with_proto()  :lvalue { $lex }
sub without_proto :lvalue { $lex }

with_proto();
without_proto();

8  <#> gv[*with_proto] s
c  <#> gv[*without_proto] s


>type test.pl && perl -MO=Concise,-exec test.pl 2>&1 | find "proto"
{ my $lex = 4; sub with_proto()  :lvalue { $lex } }
{ my $lex = 4; sub without_proto :lvalue { $lex } }

with_proto();
without_proto();

i  <#> gv[*with_proto] s
m  <#> gv[*without_proto] s
[download]

No more ideas.

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