LanguageFeatures/nnbd/flow-analysis/reachability_A07_t10.dart

// Copyright (c) 2020, 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 If N is an expression of the form E1.m1(E2), then:
///
///  Let before(E1) = before(N)
///  Let before(E2) = after(E2)
///  Let T be the static return type of the invocation
///  If T <: Never then:
///    Let null(N) = unreachable(before(N)).
///    Let notNull(N) = unreachable(before(N)).
///  Otherwise if T <: Null then:
///    Let null(N) = before(N).
///    Let notNull(N) = unreachable(before(N)).
///  Otherwise if T is non-nullable then:
///    Let null(N) = before(N).
///    Let notNull(N) = unreachable(before(N)).
///  Otherwise:
///    Let null(N) = promote(x, Null, before(N))
///    Let notNull(N) = promoteToNonNull(x, before(N))
///
/// @description Checks reachability after method call. Test static method and
/// non-nullable return type
///
/// @author sgrekhov@unipro.ru
/// @issue 41985


class C {
  static String m1() => "Lily was here";
}

main() {
  int i;
  if (C.m1() != null) {
    i = 42;   // `i` is not definitely assigned because in a weak mode the
              // condition may be false
  }
  i; // It is an error to read a local non-nullable variable which is not definitely assigned
//^
// [analyzer] unspecified
// [cfe] unspecified
}