Note that DATA filehandle is unavailable during BEGIN {}

(this is the same change as commit 1d79a27f835368158fa27370bebb63728faf77b2, but as applied)

1 files changed, 4 insertions, 1 deletions

diff --git a/pod/perldata.pod b/pod/perldata.pod
index 0dbb92afa5..38d5e9380d 100644
--- a/pod/perldata.pod
+++ b/pod/perldata.pod
@@ -296,7 +296,10 @@ ignored, but may be read via a DATA filehandle: main::DATA for __END__,
 or PACKNAME::DATA (where PACKNAME is the current package) for __DATA__.
 The two control characters ^D and ^Z are synonyms for __END__ (or
 __DATA__ in a module).  See L<SelfLoader> for more description of
-__DATA__, and an example of its use.
+__DATA__, and an example of its use.  Note that you cannot read from the
+DATA filehandle in a BEGIN block: the BEGIN block is executed as soon as
+it is seen (during compilation), at which point the corresponding
+__DATA__ (or __END__) token has not yet been seen.
 
 A word that has no other interpretation in the grammar will
 be treated as if it were a quoted string.  These are known as