Sync in a loop can suspend forever if its first block doesn't suspend

General Issues and Bug Reporting
, ,
1

Summary

Here’s the repro

using { /Fortnite.com/Devices }
using { /Verse.org/Simulation }
test_device := class(creative_device):

    FakeSuspends()<suspends>:void=
        Print("FakeSuspends")

    OnBegin<override><final>()<suspends>:void=
        Print("BEFORE")
        loop:
            Print("A")
            sync:
                FakeSuspends()
                Sleep(0.0)
            Print("B")
        Print("AFTER")
        # Will print BEFORE / A / FakeSuspends / B / A / FakeSuspends and then nothing anymore

Here the script is supposed to Print in a loop but it stops after the 2nd iteration (no crash, it just suspends forever)

Swapping the two statements makes it work as intended

using { /Fortnite.com/Devices }
using { /Verse.org/Simulation }
test_device := class(creative_device):

    FakeSuspends()<suspends>:void=
        Print("FakeSuspends")

    OnBegin<override><final>()<suspends>:void=
        Print("BEFORE")
        loop:
            Print("A")
            sync:
                Sleep(0.0) # Swapped
                FakeSuspends() # Swapped
            Print("B")
        Print("AFTER")
        # Will print BEFORE / (A / FakeSuspends / B) * infinite (as intended)

Please select what you are reporting on:

Verse

What Type of Bug are you experiencing?

Verse

Steps to Reproduce

See the repro above

Expected Result

See the repro

Observed Result

See the repro

Platform(s)

PC

2

We’ll get someone to take a look.

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3

The status of FORT-805504 incident has been moved from ‘Needs Triage’ to ‘To Do’.

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