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sub xxx { 'yyy' } if the function doesn't take any parameters, please use the empty prototype.
example "sub foo() { ... }"
sub xxx { an non-optional argument must not follow an optional argument
my ($o_xxx, $yyy) = @_;
($o_xxx, $yyy);
}
sub xxx { an array must be the last variable in a prototype
my (@xxx, $yyy) = @_;
@xxx, $yyy;
}
bad() unknown function bad
sub f0() {} too many parameters
f0('yyy')
sub f2 { my ($x, $_y) = @_; $x } not enough parameters
f2('yyy')
N("xxx %s yyy") not enough parameters
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