feat: add as type casting

src/middle/builder.rs

@@ -385,6 +385,20 @@ impl FuncBuilder {
 
                 rval_op
             }
+            TypedExprKind::Cast {
+                expr: inner,
+                ty: target_ty,
+            } => {
+                let inner_op = self.lower_expr(inner);
+                let temp = self.new_temp(target_ty.clone());
+
+                self.emit_stmt(Statement {
+                    kind: StatementKind::Assign(temp, Rvalue::Cast(target_ty.clone(), inner_op)),
+                    span: expr.span,
+                });
+
+                Operand::Copy(temp)
+            }
         }
     }
 }