Can anyone give an example of a compile time error (or warning) associated with this invocation technique

No, anonymous hash population is a run-time thing. The compiler doesn't count the elements used for the assignment. PBP is just wrong there. 

qwurx [shmem] ~ > perl -wce 'sub foo{} foo({one=>1,two=>})'
-e syntax OK

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In reply to Re: Named Subroutine Parameters: Compile-time errors vs. Run-time warnings by shmem
in thread Named Subroutine Parameters: Compile-time errors vs. Run-time warnings by AnomalousMonk

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