To be able to get a more detailed explanation of error messages one can either a priori use diagnostics for in-line expansion or a posteriori pipe an individual message through splain.¹

I'm thinking of adding a on-click interface for emacs cperl-mode to facilitate the latter (either by a tooltip or showing an extra pane). ( use diagnostics can easily make the output unreadable if too many messages are expanded )

Now I'm wondering if there are already any IDEs implementing this...

Searching didn't help much though this seems to be an obvious idea!(?)

¹) demonstration:

> echo "Can't locate function in @INC"|splain
Can't locate function in @INC (#1)
    (F) You said to do (or require, or use) a file that couldn't be
    found. Perl looks for the file in all the locations mentioned in @
+INC,
    unless the file name included the full path to the file.  Perhaps 
+you
    need to set the PERL5LIB or PERL5OPT environment variable to say w
+here
    the extra library is, or maybe the script needs to add the library
+ name
    to @INC.  Or maybe you just misspelled the name of the file.  See
    perlfunc/require and lib.
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