sema: fix type analysis of the new checked structure declaration instances

Author: mertcandav

std/jule/sema/sema.jule

@@ -2534,6 +2534,7 @@ impl sema {
 		if s.Bind {
 			ret
 		}
+		s.checked = true
 
 		if len(s.Generics) == 0 && len(s.Instances) == 0 {
 			mut ins := s.instance()

std/jule/sema/struct.jule

@@ -53,6 +53,8 @@ struct Struct {
 	// Structure instances for each unique type combination of structure.
 	// Nil if structure is never used.
 	Instances: []&StructIns
+
+	checked: bool
 }
 
 impl Struct {

std/jule/sema/type.jule

@@ -1165,7 +1165,7 @@ impl typeChecker {
 				// Disable gstruct collection.
 				self.s.meta.gstructs = self.s.meta.gstructs[:0]
 				self.s.meta.flags &= ^semametaGstruct
-			} else {
+			} else if ins.Decl.checked {
 				// gstruct collection is not enable and semas are same.
 				// So this structure is instantiated in the it's own package.
 				// Check it immediately, otherwise some defines may remain unchecked.