• Code blocks (bare, labled, if(){}, while(){}, do{}, foreach(){}, for(){}, sub{}, map{}, etc.)
• Anonymous hash constructors
• Hash subscripting (and hash slice subscripting)
• Dereferencing
• Quantification (Regexen)
• Extended regexp patterns, ie (??{...})

I'll bet I missed something completely obvious.

...not to mention the fact that you can legitimately use {} in quote-like constructs such as:

• s{}[]
• tr{}{}
• q{}, qq{}, qr{}, qx{}, etc.
• m{}

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