f g EXPR, EXPR

[download]

is the same as 

f(g(EXPR, EXPR))

[download]

my is very special in the sense that it won't gobble arguments that wouldn't be valid for it, which is why adding the quotes help.

This resolves the ambiguity: 

open my ($file), $filename

[download]

This is probably what you actually want: 

open my $file, '<', $filename

[download]

In reply to Re: Parentheses missing around "my" list by ikegami
in thread Parentheses missing around "my" list by rastoboy

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