# perl4 prints: {a}
# perl5 prints: 2
-=item * Perl guesses on C<map>, C<grep> followed by C<{> whether C<{> starts BLOCK or hash ref
+=item * Perl guesses on C<map>, C<grep> followed by C<{> if it starts BLOCK or hash ref
When perl sees C<map {> (or C<grep {>), it has to guess whether the C<{>
starts a BLOCK or a hash reference. If it guesses wrong, it will report
use Math::BigInt;
-=item * Assignment of return values from numeric equality tests doesn't works
+=item * Assignment of return values from numeric equality tests doesn't work
Assignment of return values from numeric equality tests
does not work in perl5 when the test evaluates to false (0).
=over 5
-=item * Barewords that used to look like strings look like subroutine calls if a subroutine by that name is defined
+=item * Barewords that used to look like strings look like subroutine calls
Barewords that used to look like strings to Perl will now look like subroutine
calls if a subroutine by that name is defined before the compiler sees them.
Note: perl5 DOES NOT error on the terminating @ in $bar
-=item * Arbitrary expressions are evaluated inside braces that occur within double quotes
+=item * Arbitrary expressions are evaluated inside braces within double quotes
Perl now sometimes evaluates arbitrary expressions inside braces that occur
within double quotes (usually when the opening brace is preceded by C<$>
# perl4 prints: this is XXXx (XXX is the current pid)
# perl5 prints: this is a reference
-=item * Creation of hashes on the fly with C<eval "EXPR"> requires protection of C<$>'s or both curlies
+=item * Creation of hashes on the fly with C<eval "EXPR"> requires protection
Creation of hashes on the fly with C<eval "EXPR"> now requires either both
C<$>'s to be protected in the specification of the hash name, or both curlies
=over 5
-=item * Perl5 must have been linked with the same dbm/ndbm as the default for C<dbmopen()> to function properly without C<tie>'ing
+=item * Perl5 must have been linked with same dbm/ndbm as the default for C<dbmopen()>
Existing dbm databases created under perl4 (or any other dbm/ndbm tool)
may cause the same script, run under perl5, to fail. The build of perl5
# perl5 prints: ok (IFF linked with -ldbm or -lndbm)
-=item * DBM exceeding the limit on the key/value size will cause perl5 to exit immediately
+=item * DBM exceeding limit on the key/value size will cause perl5 to exit immediately
Existing dbm databases created under perl4 (or any other dbm/ndbm tool)
may cause the same script, run under perl5, to fail. The error generated