'Illegal declaration of cycle' when struct member references sibling member size

[SaculRennorb]

Context

Please provide any relevant information about your setup. This is important in case the issue is not reproducible except for under certain conditions.

    Odin:    dev-2024-12-nightly:cf53404
    OS:      Windows 10 Enterprise N (version: 20H2), build 19042.1466   
    CPU:     Intel(R) Core(TM) i5-8400 CPU @ 2.80GHz
    RAM:     65470 MiB
    Backend: LLVM 18.1.8

Expected Behavior

This

package main

A :: struct {
	a : struct { // Illegal declaration cycle of `a`
		t : u32
	},
	b : [1024 - size_of(a)]u8, 
}

main :: proc() {  }

should compile as the size of a should already be known by the time it is used, but it doesn't.

a : u32;

A :: struct {
	b : [1024 - size_of(a)]u8, 
}

main :: proc() {  }

does compile without issues.

Current Behavior

The compiler errors with

Error: Illegal declaration cycle of a
a : struct { // Illegal declaration cycle of a

Failure Information (for bugs)

Steps to Reproduce

Please provide detailed steps for reproducing the issue.

1. copy the first snippet into a new file
2. run odin build on the file
3. error