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B::Lint(3)
NAME
  B::Lint - Perl lint

SYNOPSIS
  perl -MO=Lint[,OPTIONS] foo.pl

DESCRIPTION
  The B::Lint module is equivalent to an extended version of the -w option of
  perl. It is named after the program lint which carries out a similar
  process for C programs.

OPTIONS AND LINT CHECKS
  Option words are separated by commas (not whitespace) and follow the usual
  conventions of compiler backend options. Following any options (indicated
  by a leading -) come lint check arguments. Each such argument (apart from
  the special all and none options) is a word representing one possible lint
  check (turning on that check) or is no-foo (turning off that check). Before
  processing the check arguments, a standard list of checks is turned on.
  Later options override earlier ones. Available options are:

  context Produces a warning whenever an array is used in an implicit scalar
	  context. For example, both of the lines

	      $foo = length(@bar);
	      $foo = @bar;

	  will elicit a warning. Using an explicit scalar() silences the
	  warning. For example,

	      $foo = scalar(@bar);

  implicit-read and implicit-write
	  These options produce a warning whenever an operation implicitly
	  reads or (respectively) writes to one of Perl's special variables.
	  For example, implicit-read will warn about these:

	      /foo/;

	  and implicit-write will warn about these:

	      s/foo/bar/;

	  Both implicit-read and implicit-write warn about this:

	      for (@a) { ... }

  bare-subs
	  This option warns whenever a bareword is implicitly quoted, but is
	  also the name of a subroutine in the current package. Typical
	  mistakes that it will trap are:

	      use constant foo => 'bar';
	      @a = ( foo => 1 );
	      $b{foo} = 2;

	  Neither of these will do what a naive user would expect.

  dollar-underscore
	  This option warns whenever $_ is used either explicitly anywhere or
	  as the implicit argument of a print statement.

  private-names
	  This option warns on each use of any variable, subroutine or method
	  name that lives in a non-current package but begins with an
	  underscore ("_"). Warnings aren't issued for the special case of
	  the single character name "_" by itself (e.g. $_ and @_).

  undefined-subs
	  This option warns whenever an undefined subroutine is invoked.
	  This option will only catch explicitly invoked subroutines such as
	  "foo()" and not indirect invocations such as "&$subref()" or
	  "$obj->meth()". Note that some programs or modules delay definition
	  of subs until runtime by means of the AUTOLOAD mechanism.

  regexp-variables
	  This option warns whenever one of the regexp variables $`, $& or $'
	  is used. Any occurrence of any of these variables in your program
	  can slow your whole program down. See perlre for details.

  all	  Turn all warnings on.

  none	  Turn all warnings off.

NON LINT-CHECK OPTIONS
  -u Package
	  Normally, Lint only checks the main code of the program together
	  with all subs defined in package main. The -u option lets you
	  include other package names whose subs are then checked by Lint.

BUGS
  This is only a very preliminary version.

  This module doesn't work correctly on thread-enabled perls.

AUTHOR
  Malcolm Beattie, mbeattie@sable.ox.ac.uk.

Index for Section 3

Alphabetical listing for B

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