Runtime error "attempt to call a table value" when using "CoreLibs/object" in an anonymous function

SDK Bug Reports
,
1

Setup

  1. MacOS 12.5
  2. PlayDate Simulator Version 1.12.2 (139389)
  3. pdc version 1.12.2

Project

I have a single source directory with 3 files in it:

source/my_class.lua

import "CoreLibs/object"

class("MyClass").extends()

function MyClass:init()
end

function MyClass:hello()
    print("Hello from MyClass!")
end

source/my_class2.lua

import "CoreLibs/object"

class("MyClass2").extends()

function MyClass2:init()
end

function MyClass2:hello()
    print("Hello from MyClass2!")
end

source/main.lua

import "CoreLibs/object"

import "my_class"
import "my_class2"

local my = MyClass()
local my2 = MyClass2()

(function()
    my:hello()
    my2:hello()
end)()

function playdate.update()
end

I can successfully compile the project using pdc source output.pdx.

Expected behaviour

Two hello messages in the console, printed once.

Actual behaviour

Error message when output.pdx is opened in the simulator:

main.lua:7: attempt to call a table value
stack traceback:
	main.lua:7: in main chunk
main.lua:7: attempt to call a table value
stack traceback:
	main.lua:7: in main chunk

Theory

The problem seems to be unrelated to the error message from the simulator. If I replace the anonymous init function with an proper function definition followed by a function call, the expected behaviour is observed.

function init()
    my:hello()
    my2:hello()
end

init()

Would appreciate any help uncovering this mystery!

2

It’s a shortcoming of the Lua parser. I think this Stack Overflow answer explains it better than I could.

3

Ah, it all makes sense now. Thanks!