Which subroutine is never called? The one which is the last command in do block and which is thus stored in $code? It is called explicitly right after do block - (see $code->()) 

my $code = do {
    my $g;
    sub { $g = Scope::Guard->new( sub { warn "destroyed";  $x ; } ); }
};

$code->();

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In reply to Re^2: Reference to guard not released by roman
in thread Reference to guard not released by roman

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