provide_deprecation_message
Missing a deprecation message.
Description
#The analyzer produces this diagnostic when a deprecated annotation is
used instead of the Deprecated annotation.
Example
#The following code produces this diagnostic because the function f is
annotated with deprecated:
dart
@deprecated
void f() {}Common fixes
#Convert the code to use the longer form:
dart
@Deprecated('Use g instead. Will be removed in 4.0.0.')
void f() {}