Refactor multiple if let bindings

Replaces nested `if let` statements with sequential `if let` bindings,
improving readability. This change is applied to `Dumper::log_bound`,
`LambdaCollector::visit_bound`, `Environment::call_object_method`, and
`Environment::call_lambda`.

src/ast/compiler/dumper.rs

@@ -39,8 +39,9 @@ impl Dumper {
             BoundKind::Constant(v) => {
                 self.log(&format!("Constant: {}", v), node);
                 // Introspect Closure AST if possible
-                if let Value::Object(obj) = v {
-                    if let Some(closure) = obj.as_any().downcast_ref::<Closure>() {
+                if let Value::Object(obj) = v 
+                    && let Some(closure) = obj.as_any().downcast_ref::<Closure>() 
+                {
                         self.indent += 1;
                         self.write_indent();
                         self.output.push_str("--- Specialized Body ---\n");
@@ -58,7 +59,6 @@ impl Dumper {
                             self.output.push('\n');
                         }
                         self.indent -= 1;
-                    }
                 }
             },
             BoundKind::Get { addr, name } => self.log(&format!("Get: {} ({:?})", name.name, addr), node),