Ensure that t/io/{print,read,say}.t load Errno at BEGIN time.

If Errno is loaded after the compiler has parsed the C<exists &Errno::EBADF>
later in the script, then the intent of that test is subverted - &Errno::EBADF
does not exist, at least as far as the typeglob bound to that op is concerned,
and the test for $! is skipped. I suspect that these have been skipping since
the implementation of Errno was changed in 42607a60df6df19b in May 2010 to
reduce its memory footprint by 55%.

3 files changed, 8 insertions, 7 deletions

diff --git a/t/io/print.t b/t/io/print.t
index d29036b11d..321eb1e85b 100644
--- a/t/io/print.t
+++ b/t/io/print.t
@@ -3,11 +3,12 @@
 BEGIN {
     chdir 't' if -d 't';
     @INC = '../lib';
+    require './test.pl';
+    eval 'use Errno';
+    die $@ if $@ and !is_miniperl();
 }
 
 use strict 'vars';
-eval 'use Errno';
-die $@ if $@ and !$ENV{PERL_CORE_MINITEST};
 
 print "1..21\n";
 
diff --git a/t/io/read.t b/t/io/read.t
index 57e671d27c..8cc1640b59 100644
--- a/t/io/read.t
+++ b/t/io/read.t
@@ -4,11 +4,11 @@ BEGIN {
     chdir 't' if -d 't';
     @INC = '../lib';
     require './test.pl';
+    eval 'use Errno';
+    die $@ if $@ and !is_miniperl();
 }
 
 use strict;
-eval 'use Errno';
-die $@ if $@ and !$ENV{PERL_CORE_MINITEST};
 
 plan tests => 2;
 
diff --git a/t/io/say.t b/t/io/say.t
index 1da7a18d8f..ead4d0bbc9 100644
--- a/t/io/say.t
+++ b/t/io/say.t
@@ -3,6 +3,9 @@
 BEGIN {
     chdir 't' if -d 't';
     @INC = '../lib';
+    require './test.pl';
+    eval 'use Errno';
+    die $@ if $@ and !is_miniperl();
 }
 
 # Just a few very basic tests cribbed from t/io/print.t,
@@ -11,9 +14,6 @@ BEGIN {
 # the same way as print in any case.
 
 use strict 'vars';
-eval 'use Errno';
-die $@ if $@ and !$ENV{PERL_CORE_MINITEST};
-
 use feature "say";
 
 say "1..12";