Type compatibility error in loop

[SaracenOne]

Godot version:
45d3b96

OS/device including version:
Windows 10

Issue description:
The error 'Parser bug (please report): Trying to check compatibility of unset value type' is printed when passing an i variable of a loop into the float function.

Steps to reproduce:
Launch attached project

Minimal reproduction project:
type_compatibility.zip

[nonunknown]

All these are related to these one: #45139 & #44375

I can confirm it when typing this on my script:

func project_ray() -> void:
	var cam:Camera3D = $Gizmo/Camera3D
	var from = cam.project_ray_origin(mouse_pos)
	var to = from + cam.project_ray_normal(mouse_pos) * 1000
	var result = get_world_3d().direct_space_state.intersect_ray(from
	,to, [self])

[Blackiris]

In the reproduction project, the i variable kind is still unresolved when analyzing the call.

The i variable type should in fact be guessed from the for i in rang(0,1): expression but it is currently not yet the case.
In GDScriptAnalyzer::resolve_for, there is even a TODO comment about this:

	// TODO: If list is a typed array, the variable should be an element.
	// Also applicable for constant range() (so variable is int or float).

[EDIT]
By replacing this comment by:

	GDScriptParser::DataType var_type = p_for->variable->get_datatype();
	var_type.kind = GDScriptParser::DataType::VARIANT;
	p_for->variable->set_datatype(var_type);

The error message disappears, but to be honest, I don't have any idea what datatype means...

[cdemirer]

Can't reproduce on current master.