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Segfault when accessing an element of an array of float throught a polymorphic method. #4473

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vicuna opened this issue Jan 5, 2008 · 3 comments
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@vicuna
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vicuna commented Jan 5, 2008

Original bug ID: 4473
Reporter: sol
Status: closed (set by @garrigue on 2008-01-18T03:54:19Z)
Resolution: fixed
Priority: normal
Severity: crash
Version: 3.10.1
Fixed in version: 3.10+dev
Category: ~DO NOT USE (was: OCaml general)
Monitored by: @yakobowski

Bug description

Example:

class xyz =
object
method nth : 'a . int -> 'a array -> 'a = fun x a -> a.(x mod Array.length a)
end

Running this with an array of string, int or options... works fine. But an array of float causes a segfault.
Tested in versions: 3.09.3 on mac osx 10
and 3.10.0 on windows xp.

However the following works fine:

let nth : int -> 'a array -> 'a = fun x a -> a.(x mod Array.length a)

@vicuna
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vicuna commented Jan 7, 2008

Comment author: @xavierleroy

Confirmed in 3.10.1. The culprit is probably Typeopt.array_element_kind, which doesn't know about universally-quantified type variables.

@vicuna
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vicuna commented Jan 7, 2008

Comment author: sol

The following works as a workaround:
First create a function and assign it to a class method.

let nth : 'a array -> int -> 'a = fun a i -> a.(i mod Array.length a)

class c =
object
method nth : 'a . 'a array -> int -> 'a = nth
end

@vicuna
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vicuna commented Jan 18, 2008

Comment author: @garrigue

I commited the fix for Typeopt.array_element_kind in CVS.

@vicuna vicuna closed this as completed Jan 18, 2008
@vicuna vicuna added the bug label Mar 19, 2019
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