%hash = EXPR;

[download]
does something like 
my @anon = LIST;
%hash = ();
while (@anon) {
   my $k = shift(@anon);
   my $v = shift(@anon);
   $hash{$k} = $v;
}

[download]

So if you have two values for the same key, the latter prevails.

(There's no actual @anon created; the stack is used.)

In reply to Re^2: Throw compilation error(or warning) if duplicate keys are present in hash by ikegami
in thread Throw compilation error(or warning) if duplicate keys are present in hash by I_love_perl

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