MustCall (checker-framework 3.39.0-eisop1 API)

```
@Retention(RUNTIME)
@Target({TYPE_USE,TYPE_PARAMETER})
@SubtypeOf(MustCallUnknown.class)
@DefaultQualifierInHierarchy
@DefaultFor({EXCEPTION_PARAMETER,UPPER_BOUND})
public @interface MustCall
```
An expression of type @MustCall({"m1", "m2"}) may be obligated to call m1() and/or m2() before it is deallocated, but it is not obligated to call any other methods.
This annotation is enforced by the Object Construction Checker's -AcheckMustCall mode. It enforces that the methods m1() and m2() are called on the annotated expression before it is deallocated.
The subtyping relationship is:
```
@MustCall({"m1"}) <: @MustCall({"m1", "m2"})
```
See the Checker Framework Manual:
Must Call Checker

- Optional Element Summary
  
  Optional Elements
  Modifier and Type Optional Element Description
  
  java.lang.String[] value
  Methods that might need to be called on the expression whose type is annotated.

- Element Detail
  - value
```
java.lang.String[] value
```
    Methods that might need to be called on the expression whose type is annotated.
    
    Returns:
    
    methods that might need to be called
    
    Default:
    
    {}