Deprecation warnings are not suppressed in lambdas of deprecated methods

[Madjosz]

Transfer of Bug 562113

Problem

Adding @Deprecated to a method normally tells the compiler to ignore all deprecation warnings in that method. This fails for calls to deprecated methods in a lambda in the deprecated method.

Example

public class IamDeprecated {
  @Deprecated
  static void deprecatedMethod(Object o) {}
}

public class DeprecationWarning {
  @Deprecated
  void callDeprecated() {
    IamDeprecated.deprecatedMethod(null);                   // no warning
    List.of().forEach(IamDeprecated::deprecatedMethod);     // no warning
    List.of().forEach(o -> IamDeprecated.deprecatedMethod(o)); // warning
  }
}

Expected behaviour

javac -Xlint:deprecation shows no deprecation warnings in all 3 cases.

Additional: @SuppressWarnings("deprecation") will suppress all 3 warnings when callDeprecated() is not @Deprecated (and also when it is)

System information

Eclipse SDK
Version: 2023-12 (4.30)
Build id: I20230911-1800

openjdk version "20.0.2" 2023-07-18
OpenJDK Runtime Environment Temurin-20.0.2+9 (build 20.0.2+9)
OpenJDK 64-Bit Server VM Temurin-20.0.2+9 (build 20.0.2+9, mixed mode, sharing)

Microsoft Windows 10 Pro 10.0.19045

[srikanth-sankaran]

I'll take a look

[Madjosz]

Confirmed works in I20231004-0320.
Thank you for fixing this long lasting bug! 🚀