third_party/v8/test/mjsunit/regress/regress-815.js

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// 815 describes a situation in which the ARM code generator could
// end up in a spilled scope in code that only worked in a register
// allocated scope.  Test that this no longer happens.
//
// The code generated for unary + assumes that we are not in a spilled
// scope.

var o = new Object();

// The code for the iterated-over object in for-in used to be emitted
// in a spilled scope:
for (x in +o) { }

// Emitting code for the left hand side of a for-in.
for (a[+o] in o) {}

// The receiver in an obj[index](1, 2, 3) call:
try {
  o[+o](1,2,3)
} catch(e) {
  // It's OK as long as it does not hit an assert.
}