sentence: braces ( a.k.a curly brackets ) -lcb- ... -rcb- : curly bracket programming language : c , c++ , objective-c , go , java , javascript , ecmascript , c# , d , perl , php ( for & loop loops , or pass a block as argument ) , rust , scala , s-lang , swift , windows powershell , haskell ( in do-notation ) parentheses ( ... ) ocaml , standard ml brackets ( ... ) smalltalk ( blocks are first class objects .