thread_t::raise_error() incorrect line number

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thread_t::raise_error() will raise an error using the next PC rather then the PC that generated the error. This can cause the reported line number to be incorrect.

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In this test case test.length doesnt exist but the error will be reported on line end.

function main()
  var test[3] = 1, 2, 3
  test.length = 1234
end