When writing a function with a & prototype like this: 

sub foo(&@)
{
    my $code = shift;

    # whatever ...
}

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how come when using it, this works: 
foo {$_ =~ /foo/} $a, $b, $c;

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but this doesn't: 
foo({$_ =~ /foo/} $a, $b, $c);

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I found a few references searching Google but no explanation that satisfies me. After all, I can call built-ins either way, e.g., this works: 

my @x = grep({$_ =~ /foo/} @list);

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Nothing in the Camel book either unless I just can't find it. I need enlightenment.

In reply to & function prototypes and parens by steves

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