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Unexported values can cause non-generalisable variables error #7070

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vicuna opened this issue Dec 1, 2015 · 4 comments

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commented Dec 1, 2015

Original bug ID: 7070
Reporter: @lpw25
Assigned to: @lpw25
Status: resolved (set by @Octachron on 2017-07-27T20:43:42Z)
Resolution: fixed
Priority: low
Severity: feature
Target version: undecided
Fixed in version: 4.06.0 +dev/beta1/beta2/rc1
Category: typing
Monitored by: @hcarty

Bug description

The following .ml file:

let r = ref []

let r = 0

gives the error message:

File "foo.ml", line 2, characters 8-14:
Error: The type of this expression, '_a list ref,
contains type variables that cannot be generalized

even though the offending value has been shadowed and so cannot cause any problems.

I think that check_nongen_scheme should probably be run on the simplified signature rather than the original signature.

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commented Feb 22, 2017

Comment author: @alainfrisch

Are there cases where the error you suggest to avoid is not actually related to a defect in the code (in your case, an unused declaration)?

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commented Feb 22, 2017

Comment author: @alainfrisch

Not sure this qualifies as a bug, so downgrading to "feature".

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commented Apr 6, 2017

Comment author: @lpw25

Pull request:

#1139

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commented Jul 27, 2017

Comment author: @Octachron

Fixed by merging the above PR.

@vicuna vicuna closed this Jul 27, 2017

@vicuna vicuna added the typing label Mar 14, 2019

@vicuna vicuna added the feature-wish label Mar 20, 2019

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