v8/test/mjsunit/regress/regress-smi-only-concat.js

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// Flags: --allow-natives-syntax

// This tests that concatenating a fast smi-only array and a fast object array
// results in a fast object array.

var fast_array = ['a', 'b'];
var array = fast_array.concat(fast_array);

assertTrue(%HasFastObjectElements(fast_array));
assertTrue(%HasFastObjectElements(array));