I'm using Devel::TraceUse with a script that uses the 'lib' module: 
use lib 'my-lib';
use Fcntl;

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Running perl -d:TraceUse script.pl results in: 

Modules used from ./script.pl:
  lib, line 2 (0.003514)
    Fcntl, line 1 (0.000265)
      Fcntl, line 1 (0.000531)
        Fcntl, line 1 (0.000847)
          Fcntl, line 1 (0.001094)
  Fcntl, line 8 (0.001204)
    XSLoader, line 1 (1.7e-05)
    XSLoader, line 1 (0.000449)
    XSLoader, line 1 (0.000715)
    XSLoader, line 1 (0.000965)
    XSLoader, line 61 (0.001219)

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If I add a for (@INC) { print "INC: $_\n" } after the use lib line, I get this output: 
INC: my-lib/5.8.8/i386-linux-thread-multi
INC: my-lib/5.8.8
INC: my-lib/5.8.6
INC: my-lib
INC: CODE(0x98f8e08)
INC: ...(lots of other directories omitted)...
...
Modules used from ./script.pl:
  lib, line 2 (0.003122)
    Fcntl, line 1 (0.000253)
      Fcntl, line 1 (0.000494)
        Fcntl, line 1 (0.000747)
          Fcntl, line 1 (0.000995)
  Fcntl, line 8 (0.001262)
    XSLoader, line 1 (0.0002)
    XSLoader, line 1 (0.000423)
    XSLoader, line 1 (0.000659)
    XSLoader, line 1 (0.000736)
    XSLoader, line 61 (0.001646)

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So it seems that when use lib adds multiple directories to @INC things go screwy for Devel::TraceUse.

I haven't run into this problem if use lib 'my-lib' only adds one directory to @INC.

Is there a way to fix this?

In reply to Devel::TraceUse bizarreness by perl5ever

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