std::comptime: add the Mutable method to the comptimeTypeInfo

std/comptime/type.jule

@@ -92,6 +92,9 @@ impl comptimeTypeInfo {
 
     // Reports whether kind supports comparable constrait as constant expression.
     fn Comparable(self): bool
+
+    // Reports whether kind is mutable as constant expression.
+    fn Mutable(self): bool
 }
 
 */

std/jule/sema/comptime.jule

@@ -505,6 +505,17 @@ impl comptimeType {
         }
     }
 
+    fn _Mutable(&self): &Data {
+        let mut constant = Const.NewBool(self.base.Mutable())
+        ret &Data{
+            Kind: &TypeKind{
+                Kind: buildPrimType(PrimKind.Bool),
+            },
+            Constant: constant,
+            Model: constant,
+        }
+    }
+
     fn subIdent(mut &self, ident: str): &Data {
         match ident {
         | "Str":
@@ -584,6 +595,13 @@ impl comptimeType {
                 },
             }
             ret buildAsComptimeMethodData(method)
+        | "Mutable":
+            let mut method = &FnIns{
+                caller: fn(mut &e: &Eval, mut &fc: &ast::FnCallExpr, mut &_: &Data): &Data {
+                    ret self._Mutable()
+                },
+            }
+            ret buildAsComptimeMethodData(method)
         | "Kind":
             let mut method = &FnIns{
                 caller: fn(mut &e: &Eval, mut &fc: &ast::FnCallExpr, mut &_: &Data): &Data {