```
CMake Warning (dev) at /usr/share/cmake/Modules/UseJava.cmake:716 (cmake_parse_arguments):
The OUTPUT_DIR keyword was followed by an empty string or no value at all.
Policy CMP0174 is not set, so cmake_parse_arguments() will unset the
_add_jar_OUTPUT_DIR variable rather than setting it to an empty string.
Call Stack (most recent call first):
cmake/modules/CreateSourceJar.cmake:29:EVAL:1 (add_jar)
cmake/modules/CreateSourceJar.cmake:29 (cmake_language)
wpiannotations/CMakeLists.txt:29 (add_source_jar)
This warning is for project developers. Use -Wno-dev to suppress it.
CMake Warning (dev) at /usr/share/cmake/Modules/UseJava.cmake:716 (cmake_parse_arguments):
The OUTPUT_DIR keyword was followed by an empty string or no value at all.
Policy CMP0174 is not set, so cmake_parse_arguments() will unset the
_add_jar_OUTPUT_DIR variable rather than setting it to an empty string.
Call Stack (most recent call first):
cmake/modules/CreateSourceJar.cmake:29:EVAL:1 (add_jar)
cmake/modules/CreateSourceJar.cmake:29 (cmake_language)
wpiunits/CMakeLists.txt:25 (add_source_jar)
This warning is for project developers. Use -Wno-dev to suppress it.
```
Adds a `@NoDiscard` annotation that can be placed on methods to guarantee their return values are used and on types to guarantee that any method returning that type uses the return value.
Methods that call `@NoDiscard`-annotated functions can add a `@SuppressWarnings("NoDiscard")` or `@SuppressWarnings("all")` annotation (or annotation on the class declaring that method) to silence the compiler error warnings.
