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| author | Jarkko Hietaniemi <jhi@iki.fi> | 1999-07-27 12:42:43 +0000 |
|---|---|---|
| committer | Jarkko Hietaniemi <jhi@iki.fi> | 1999-07-27 12:42:43 +0000 |
| commit | 252aa0820e6bce274b33bd342cfc65e18a59a165 (patch) | |
| tree | 1806e58de44b0a99806e6393ef563649f1e42438 /pod/perllexwarn.pod | |
| parent | 2cc242586845107754f99fa3e09637c9a344d545 (diff) | |
| download | perl-252aa0820e6bce274b33bd342cfc65e18a59a165.tar.gz | |
Integer constants (0x, 0[0-7], 0b) now overflow fatally,
they used to be just optional lexical warnings.
Also, with warnings turned on, constants > 2**32-1
trigger a non-portability warning.
p4raw-id: //depot/cfgperl@3798
Diffstat (limited to 'pod/perllexwarn.pod')
| -rw-r--r-- | pod/perllexwarn.pod | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/pod/perllexwarn.pod b/pod/perllexwarn.pod index 11947550c5..484e211000 100644 --- a/pod/perllexwarn.pod +++ b/pod/perllexwarn.pod @@ -50,11 +50,12 @@ warnings: mandatory and optional. As its name suggests, if your code tripped a mandatory warning, you would get a warning whether you wanted it or not. -For example, the code below would always produce an C<"integer overflow"> -warning. +For example, the code below would always produce an C<"isn't numeric"> +warning about the "2:". - my $a = oct "777777777777777777777777777777777777" ; + my $a = "2:" + 3; +though the result will be 5. With the introduction of lexical warnings, mandatory warnings now become I<default> warnings. The difference is that although the previously @@ -63,9 +64,9 @@ subsequently enabled or disabled with the lexical warning pragma. For example, in the code below, an C<"integer overflow"> warning will only be reported for the C<$a> variable. - my $a = oct "777777777777777777777777777777777777" ; + my $a = "2:" + 3; no warning ; - my $b = oct "777777777777777777777777777777777777" ; + my $b = "2:" + 3; Note that neither the B<-w> flag or the C<$^W> can be used to disable/enable default warnings. They are still mandatory in this case. @@ -206,7 +207,7 @@ to change. =head2 Category Hierarchy -A tentative hierarchy of "categories" have been defined to allow groups +A B<tentative> hierarchy of "categories" have been defined to allow groups of warnings to be enabled/disabled in isolation. The current hierarchy is: @@ -312,6 +313,9 @@ The experimental features need bottomed out. around the limitations of C<$^W>. Now that those limitations are gone, the module should be revisited. + octal + 'octal' controls illegal octal characters warning but 'unsafe' + illegal hexadecimal and binary characters warning. =head1 SEE ALSO |