Well I don't know anymore where I read the word "frame" in connection with foreach-loops.
The glossary of the docs is often far too fuzzy to justify a long discussion...
Anyway grepping through the docs produced
perldiag.pod: (P) The foreach iterator got called in a non-loop context frame.
(I didn't say "call frame")
But the C code is quite hard for me too understand without more conceptual basics... which are fuzzy ...
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