From The RT System itself

A better fix is to avoid reentering it in the first place, by checking
for curcop == &compiling. Which is what I have done to the version of
your patch that has entered the repository.

For some obscure reasons I did test the %! auto-require stuff yesterday
and found that it doesn't work (in Perl 5.005_03 and 5.005_61). Well
actually it does work at runtime, just not at compile-time, exactly as the
comments indicate. But isn't this quite confusing​:

  print "$_\n" foreach keys %{'!'};

works (loads Errno.pm), but

  print "$_\n" foreach keys(%!);

doesn't. I would think this should either always work or it should be
disabled altogether. Or is this just waiting for the reentrant lexer,
which is just around the corner? :-)

BTW, I did send a perlbug report about this yesterday, but it hasn't
appeared on p5p at all. Maybe the perlbugtron is offline?

-Jan

-----------------------------------8<-----------------------------------
Change 1173 by gsar@​aatma on 1998/06/21 06​:51​:38

applied patch, modified logic to avoid reentering lexer at compile-time
Message-ID​: <19980619113104.S9711@​asic.sc.ti.com>
Date​: Fri, 19 Jun 1998 11​:31​:04 -0500
From​: Graham Barr <gbarr@​ti.com>
Subject​: Re​: [PATCH perl5.004_67] Add Errno in ext/

[snip]

==== //depot/perl/gv.c#28 (text) ====
Index​: perl/gv.c
--- perl/gv.c.1 Sun Jun 21 21​:30​:19 1998
+++ perl/gv.c Sun Jun 21 21​:30​:19 1998
@​@​ -711,9 +711,9 @​@​
goto magicalize;

case '\!'​:

- if(len > 1)
+ if (len > 1)
break;
- if(sv_type > SVt_PV) {
+ if (sv_type > SVt_PV && curcop != &compiling) {
HV* stash = gv_stashpvn("Errno",5,FALSE);
if(!stash || !(gv_fetchmethod(stash, "TIEHASH"))) {
dSP;

From @schwern

[RT_System - Mon Sep 20 05​:51​:22 1999]​:

For some obscure reasons I did test the %! auto-require stuff yesterday
and found that it doesn't work (in Perl 5.005_03 and 5.005_61). Well
actually it does work at runtime, just not at compile-time, exactly as the
comments indicate. But isn't this quite confusing​:

print "$\_\\n" foreach keys %\{'\!'\};

works (loads Errno.pm), but

print "$\_\\n" foreach keys\(%\!\);

doesn't.

This appears to be resolved in 5.8.6 and probably earlier.

The RT System itself - Status changed from 'stalled' to 'open'

@schwern - Status changed from 'open' to 'resolved'