Build stuck on Semantic (type declarations)

Help & Support
1

Hi,
I am stuck on code compilation phase: [4/13] Semantic (type declarations)
Crystal version is 1.8.2
I have this error after changing the following code:

abstract class Pipeable(T)
  property id : String?
  property in_channel : Channel(T)?

TO:

abstract class Pipeable(T)
  property id : String?
  property in_channel : Channel(PipeMessage(T))?

My system info:
System:
Kernel: 6.1.29-1-MANJARO arch: x86_64 bits: 64 compiler: gcc v: 12.2.1
parameters: BOOT_IMAGE=/boot/vmlinuz-6.1-x86_64
root=UUID=9c573c2e-069b-4273-aac2-a972294567e5 rw quiet splash apparmor=1
security=apparmor udev.log_priority=3
Desktop: GNOME v: 43.5 tk: GTK v: 3.24.37 wm: gnome-shell dm: GDM v: 44.0
Distro: Manjaro Linux base: Arch Linux
Machine:
Type: Laptop System: HP product: HP 250 G8 Notebook PC
v: Type1ProductConfigId serial: Chassis: type: 10
serial:
Mobo: HP model: 85F3 v: 40.38 serial: UEFI: Insyde
v: F.57 date: 09/19/2022
Battery:
ID-1: BAT1 charge: 8.2 Wh (21.3%) condition: 38.5/41.0 Wh (93.8%) volts: 10.9
min: 11.3 model: COMPAL PABAS0241231 type: Li-ion serial:
status: discharging
Memory:
System RAM: available: 15.41 GiB used: 4.22 GiB (27.4%)
RAM Report: permissions: Unable to run dmidecode. Root privileges required.
CPU:
Info: model: Intel Core i5-1035G1 bits: 64 type: MT MCP arch: Ice Lake
gen: core 10 level: v4 note: check built: 2019-21 process: Intel 10nm
family: 6 model-id: 0x7E (126) stepping: 5 microcode: 0xB8
Topology: cpus: 1x cores: 4 tpc: 2 threads: 8 smt: enabled cache:
L1: 320 KiB desc: d-4x48 KiB; i-4x32 KiB L2: 2 MiB desc: 4x512 KiB L3: 6 MiB
desc: 1x6 MiB
Speed (MHz): avg: 1192 high: 1200 min/max: 400/3600 scaling:
driver: intel_pstate governor: powersave cores: 1: 1200 2: 1200 3: 1143
4: 1200 5: 1200 6: 1200 7: 1200 8: 1200 bogomips: 19048

2

It seems like a bug, maybe it got stuck in a loop? Anyway, but it’s hard to tell from the small snippet. Do you think you can reduce the original program into something we can inspect?

3

Here few code snippets

class PipeMessage(T)
  property headers = Hash(String, String).new
  property body : T?
end

abstract class Pipeable(T)
  property in_channel : Channel(PipeMessage(T))?
  property out_channel : Channel(PipeMessage(T))?
  property prev_pipeable : Pipeable(PipeMessage(T))? #loop?
end

As you suggested probably there is a loop.
I think the loop is due to the following row: property prev_pipeable : Pipeable(PipeMessage(T))? infact if I remove the row, the build is successful

my fault is due to the fact that I put Pipeable(PipeMessage(T))? instead of Pipeable(T)? and this mistake accidentally discovered probably a bug during the build phase

let me know if the information above are enough

P.S.: if i change Pipeable(PipeMessage(T))? with Pipeable(T)? (that is what I want) the build is successful

Thanks

4

Reduced:

class PipeMessage(T)
  @body : T?
end

class Pipeable(T)
  @prev_pipeable : Pipeable(PipeMessage(T))?
end