G'day kikuchiyo,

This is intended mainly as a confirmation that the problem was fixed in v5.38. I put "BEGIN { say $^V }" near the top of the script but otherwise left your code as is. I tried with v5.36.0 and v5.38.0 (I don't have v5.36.1 available). 

v5.36.0
Global symbol "$undeclared_variable" requires explicit package name ..
+.
Type of arg 1 to List::Util::any must be block or sub {} (not referenc
+e constructor) ...

[download]
v5.38.0
Global symbol "$undeclared_variable" requires explicit package name ..
+.

[download]

After uncommenting the my declaration: 

v5.36.0
Printing inside foo()
Printing inside bar()

[download]
v5.38.0
Printing inside foo()
Printing inside bar()

[download]

— Ken

In reply to Re: Where does the spurious error message come from? by kcott
in thread Where does the spurious error message come from? by kikuchiyo

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