Challenge 2: Diagnose the Missing 1; — Possible Solution
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One-sentence explanation:
A script trying to "use" or "require" this module fails with an error
like "Module.pm did not return a true value at script.pl line N",
because the module's LAST evaluated expression is the subroutine
DEFINITION itself (which is not a true/false value in the sense
Perl's loading mechanism checks), rather than an explicit true value.

Corrected final lines (given a module ending with a sub definition,
e.g.):

sub some_function {
    ...
}

1;   # added — the required trailing true value

WHY THIS WORKS AS AN ANSWER
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The explanation reuses the chapter's own warn-box almost exactly —
"Perl checks the file's last evaluated expression — if it isn't true,
loading fails with 'Utils.pm did not return a true value'" — applied
here to the specific scenario the challenge describes (a sub
definition as the final statement) rather than the chapter's own
generic Utils.pm example.

A sub NAME_HERE { ... } block, as a statement, doesn't itself evaluate
to a true or false value in the way Perl's module-loading check
requires — it's a declaration, not an expression with a meaningful
boolean result — so without something explicit after it, the module
loading fails exactly as described.

The fix reuses the chapter's own solution precisely: adding 1; as a
new, separate final statement after every other line in the file,
including after the last sub definition — this gives the file a
genuine, unambiguous true value as its last evaluated expression,
satisfying Perl's requirement and allowing use/require to succeed.