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FABLE translates unsigned long integer ranges into infinite loops

See original GitHub issue

Description

The F# code [0UL..10UL] when translated via FABLE leads to an infinite loop

Repro code

Please provide the F# code to reproduce the problem. Ideally, it should be possible to easily turn this code into a unit test.

let main(argv[])=
    printfn "%A" [0UL..10UL]

Expected and actual results

Expected: list of 11 numbers Actual: loops forever

Related information

fable.io does this. Also FABLE 1.0.6

Fable version (dotnet fable --version):
Operating system: win 10 (translating to .Net Core 2.1.101)

Issue Analytics

State:
Created 5 years ago
Reactions:1
Comments:6 (6 by maintainers)

Top GitHub Comments

1reaction

alfonsogarciacarocommented, Sep 4, 2018

Sorry, I just noticed the range function didn’t deal with longs so I created a specialized one for them. Should be fixed in the next release 👍

0reactions

tomclcommented, Aug 31, 2018

@alfonsogarciacaro

The long range lock-up issue remains with 2.0.0-beta-003

A simple range of longs, anywhere in code, creates an infinite loop in the CLI and also REPL2

let y = [0L..10L]

The REPL2 code is: ofSeq(range( starting long, end long)
the start/end longs are correct.

I could probably PR this if I knew whether the compiler uses the same JS translation, and if so where ofSeq and range are located? I’m still not good at finding my way round the compiler internals!

It would be nice to deal with as many as possible of the integer corner cases…