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NestedArray.cr
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| alias Type = Int32 | String | Array(Type) | |
| foo = Array(Type).new | |
| foo.push(1) | |
| foo.push("foo") | |
| foo.push([ 1, 2, "foo" ] of Type) | |
| foo.push([ 1, 2, [ 3, 4, "foo" ] of Type] of Type) | |
| p foo | |
| # => [1, "foo", [1, 2, "foo"]] |
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