10
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When I open mathematica, there will pop-up some messages

enter image description here

where

<< package`

is in the following file

FindFile["init.m"]

(*
    C:\Users\HyperGroups\AppData\Roaming\Mathematica\Kernel\init.m
*)

package content in the package file:

BeginPackage["Test1`"]

Test1::usage = "";

Begin["`Private`"];

Nearest[{1, 2, 3, 5, 8, 5}, 5]

End[]

EndPackage[]

I've tried * Mathematica * 10.1@Windows and 10.0[without this problem]

Seems the problem is related with some special functions, like Nearest

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3
  • $\begingroup$ Problem confirmed in 10.1.0 under Windows 7 x64. $\endgroup$
    – Mr.Wizard
    May 27, 2015 at 14:45
  • 1
    $\begingroup$ should this be tagged as a bug? $\endgroup$
    – P. Fonseca
    May 28, 2015 at 5:38
  • 2
    $\begingroup$ Certainly it is one, but a fix would be (very) non-trivial. I tend to view it as more of a limitation. $\endgroup$
    – ilian
    May 28, 2015 at 14:18

1 Answer 1

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17
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Update

This has been fixed in a general way as of version 11.2.0. For more details, see this answer.

This is a known issue. It is not about package loading (or Nearest) but about Catch/Throw not working correctly when used during kernel initialization. For example, just putting the following in init.m

Catch[Throw[1]]

will result in similar behavior. See also Arnoud Buzing's post here.

The workaround I've been using is to run any init code depending on Catch/Throw as a scheduled task, e.g.

task := Get["package`"];
RunScheduledTask[task, {1}]
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2
  • 1
    $\begingroup$ I must be missing something... nowhere in the OP's code is there a call to Catch or Throw. Should I understand that there are calls to these functions inside Nearest? $\endgroup$
    – QuantumDot
    May 25, 2016 at 9:01
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    $\begingroup$ @QuantumDot Yes, see e.g. TracePrint[Nearest[{1, 2, 4, 8, 16, 32}, 20], _Catch, TraceInternal -> True] $\endgroup$
    – ilian
    May 25, 2016 at 15:19

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