22 lines
639 B
Text
22 lines
639 B
Text
/-
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Copyright (c) 2020 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Authors: Leonardo de Moura
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-/
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prelude
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import Init.LeanInit
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import Init.Data.Array.Basic
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import Init.Data.Array.Subarray
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namespace Array
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syntax:max term noWs "[" term ":" term "]" : term
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syntax:max term noWs "[" term ":" "]" : term
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syntax:max term noWs "[" ":" term "]" : term
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macro_rules
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| `($a[$start : $stop]) => `(Array.toSubarray $a $start $stop)
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| `($a[ : $stop]) => `(Array.toSubarray $a 0 $stop)
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| `($a[$start : ]) => `(let a := $a; Array.toSubarray a $start a.size)
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end Array
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