| // Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| /// @assertion To infer the type of element: |
| /// ... |
| /// If element is a mapEntry ek: ev: |
| /// ... |
| /// If P is Map<Pk, Pv> then the inferred key type of element is the inferred |
| /// type of ek in context Pk and the inferred value type of element is the |
| /// inferred type of ev in context Pv. |
| /// |
| /// @description Checks that if P is Map<Pk, Pv> then the inferred key type of |
| /// element is the inferred type of ek in context Pk and the inferred value type |
| /// of element is the inferred type of ev in context Pv. |
| /// |
| /// See Issue 43139 evaluation: With null safety, doing 1 + x in a double context |
| /// will figure out that the only way int + something is going to be a double is |
| /// if the something is a double, so it will give x a context type of double. |
| /// Then double x = 1 + 1; will convert the latter 1 to a double literal, and the |
| /// result becomes a double. So, there is not compile error here with nnbd, and |
| /// it's a compile error without nnbd. |
| /// @Issue 43139 |
| /// @author sgrekhov@unipro.ru |
| |
| main() { |
| Map<double, double> x1 = {1 + 1: 1.0}; |
| Map<double, double> x2 = {1.0: 1 + 1}; |
| } |