Initializing a const vec2[] in a shader's global scope gives error Expected initialization of constant

[ErnestoBorio]

Godot version

3.2.3.stable

System information

MacOS 10.15.7 build 19H1217, AMD Radeon Pro 5300M, GLES3

Issue description

When I try to declare a global const array in a shader whose elements are vec2 or vec3, I get the error Expected initialization of constant.
It does work inside of a function, though. But not globally.

The Docs don't say anything about global const vec2[] or other types not being supported.

Steps to reproduce

Create a shader with the following content:

shader_type canvas_item; 
const vec2 a[] = {
    vec2(-1, 0),
    vec2(1, 0)
};

Minimal reproduction project

No need of a project, just using that code in a shader will do.

[Calinou]

cc @Chaosus

[Chaosus]

Yeah, #32751 should be ported to 3.x.

[akien-mga]

Fixed by #50889.