In-Game: [Windows] Function declaration is broken in object inheritance starting in runtime 2024.1300.0.762

[gm-bug-reporter]

Description

We are observing a regression of #8129 starting in runtime 2024.1300.0.762. The sample's test case worked in pre-762 runtimes but started failing in 762.

Steps To Reproduce

1. Run the sample in Windows VM under the dev configuration
2. See that the child object grc_o_helper_blank_child calls the parent object's init_instance_variables() instead of its own.

Which version of GameMaker are you reporting this issue for?

IDE v2024.1300.0.758 Runtime v2024.1300.0.768

Which operating system(s) are you seeing the problem on?

Windows 10.0.26100.0

Which platform(s) are you seeing the problem on?

Windows

79a2798a-c019-41b8-b691-ca0745ebf91f

[rwkay]

This is not a bug, but it was a change in the 2024.11 runtime / compiler - within an object the compiler will choose the quickest method for calling a function, in this case the init_instance_variables function is declared (as a named function) within the event since you are using the direct syntax the compiler does not know that you are intending this to be overridden and it should use the method variables and not the direct call. If you change the code within the grc_o_helper_blank to be explicit that you want to use a instance method variable rather than a direct call so self.init_instance_variables() OR you declared the functions as init_instance_variables = function() { ..... } rather than a named function (then the compiler would default to the instance method)