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fatal error during flambda pass #7291

vicuna opened this issue Jul 18, 2016 · 4 comments

fatal error during flambda pass #7291

vicuna opened this issue Jul 18, 2016 · 4 comments


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@vicuna vicuna commented Jul 18, 2016

Original bug ID: 7291
Reporter: @c-cube
Assigned to: @mshinwell
Status: closed (set by @damiendoligez on 2016-10-26T14:26:19Z)
Resolution: fixed
Priority: normal
Severity: crash
Platform: all?
OS: archlinux 64 bits
Version: 4.03.0
Target version: 4.04.0 +dev / +beta1 / +beta2
Fixed in version: 4.04.0 +dev / +beta1 / +beta2
Category: middle end (typedtree to clambda)

Bug description

A project of mine compiles fine on 4.03.0, but fails in 4.03.0+flambda with the following error:

>> Fatal error: When simplifying [Project_var], the closure ID subst/3626 in the approximation of the set of closures did not match the closure ID subst_partial_fun/3548 in the [Project_var] term.  Approximation: { descr=(closure:
subst/3626 from { descr=(set_of_closures:
subst/3626 invariant_params={ (param/3627 { }) } freshening={ vars_within_closure 
{ (id/3573 id/3625) }, closure_id { (subst/3574 subst/3626) } }) var=subst_set_of_closures/3632 symbol=<no symbol> }) var=subst/3636 symbol=<no symbol> }
 Var-within-closure being projected: subst_1967/3549

Fatal error: exception Misc.Fatal_error

Steps to reproduce

$ opam sw 4.03.0+flambda
$ opam pin add -k git nunchaku

it should fail during compilation of nunchaku itself. Sorry, the compilation is a bit long.

Additional information

Opam files are attached (colored output enabled, use less -R).

File attachments

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@vicuna vicuna commented Jul 28, 2016

Comment author: @mshinwell

I am going to look at this.

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@vicuna vicuna commented Jul 29, 2016

Comment author: @mshinwell

I have made progress on this today, and hope we can get a fix early next week.

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@vicuna vicuna commented Aug 1, 2016

Comment author: @mshinwell


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@vicuna vicuna commented Oct 26, 2016

Comment author: @damiendoligez

This bug is fixed by #780, which supersedes #731.


@vicuna vicuna closed this Oct 26, 2016
@vicuna vicuna added the middle-end label Mar 14, 2019
@vicuna vicuna added this to the 4.04.0 milestone Mar 14, 2019
@vicuna vicuna added the bug label Mar 20, 2019
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