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Aliased result type of GADT constructor results in assertion failure #6930

vicuna opened this issue Jul 14, 2015 · 1 comment


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commented Jul 14, 2015

Original bug ID: 6930
Reporter: jmcarthur
Assigned to: @garrigue
Status: closed (set by @xavierleroy on 2017-02-16T14:14:56Z)
Resolution: fixed
Priority: normal
Severity: minor
Version: 4.02.1
Fixed in version: 4.02.3+dev
Category: typing
Monitored by: @gasche

Bug description

Using an alias as the result type of a GADT constructor seems to be crash the compiler as soon as you try to use the constructor. See "steps to reproduce."

Steps to reproduce

Try to compile the following program:

type t = T : (t as 't) -> 't
let f t = T t

Additional information

My example doesn't break if I define the type like this instead:

type t = T : 't -> (t as 't)

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commented Jul 15, 2015

Comment author: @garrigue

Fixed in branch 4.02 at revision 16205.

@vicuna vicuna closed this Feb 16, 2017

@vicuna vicuna added the typing label Mar 14, 2019

@vicuna vicuna added the bug label Mar 20, 2019

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