That's because it should be tcl_defs, not tclDefs: 

my %my_tcldefs = %{$cliParms->{'tcl_defs'}};

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EDIT: for the benefit of later readers and to avoid confusion, when I wrote this reply, the original question (since edited, apparently) indeed said tcl_defs.

In reply to Re^3: help on reference to hash by AppleFritter
in thread help on reference to hash by skyworld_chen

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