Fixed bad error message when no return value + compound inferred type

examples/push_struct.core

@@ -1,15 +1,23 @@
-#import "Arena.core"
+MA :: #import "Arena.core"
 
-// @todo:
-// Add new special type #Type_Size
+/*
+PushStruct :: (a: *MA.Arena, $Type): *Type
+	size := size_of(Type)
+	result := PushSize(a, size)
+	return result
+*/
 
-PushStruct :: (a: *Arena, type: Type /*#Type_Size*/): *void
+Color :: struct ;; r: F32; g: F32; b: F32; a: F32
+AlmostLinearToSRGB :: (a: Color): Color;; return {asd(a.r), asd(a.g), asd(a.b), a.a}
+
+PushStruct :: (a: *MA.Arena, type: Type): *void
 	ti := GetTypeInfo(type)
-	result := PushSize(a, ti.size->Base.SizeU)
+	result := MA.PushSize(a, ti.size->U64)
 	return result
 
 main :: (argc: int, argv: **char): int
-	arena: Arena
+	arena: MA.Arena
 	a: *int = PushStruct(&arena, int)
+	Assert(arena.len == SizeOf(int))
 
 	return 0