Aha, you're right. The thing was that 
print "C:";
for (qq{ab cd}) {
    print /(\S+)/g or die; # prints "C:abcd", list context again
}
print "\n";

[download]
was evaluated just like 
print "C:";
for (qq{ab cd}) {
    print(/(\S+)/g) or die;
}
print "\n";

[download]
It can be fixed like this: 
print "D:";
for (qq{ab cd}) {
    print /(\S+)/g || die;
}
print "\n";

[download]
However seems "or" not always enforces scalar context: 
my @a = (1,2,3);
print "X:";
print (0 || @a);
print "\n";
print "Y:";
print (@a || 0);
print "\n";

[download]
prints 
X:123
Y:3

[download]

In reply to Re^3: map BLOCK evaluation context by vsespb
in thread map BLOCK evaluation context by vsespb

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