public <T> void seed(Class<T> clazz, Provider<T> value) {
            provided.put(Key.get(clazz), new CachingProvider<>(value));
        }

        @SuppressWarnings("unchecked")
        public <T> Provider<T> scope(Key<T> key, Provider<T> unscoped) {
            Provider<?> provider = provided.computeIfAbsent(key, k -> new CachingProvider<>(unscoped));
            return (Provider<T>) provider;

     *
     * @param systemProperties The system properties, may be {@code null}.
     * @return This context, never {@code null}.
     */
    @SuppressWarnings("unchecked")
    public DefaultProfileActivationContext setSystemProperties(Properties systemProperties) {
        return setSystemProperties(toMap(systemProperties));
    }

    /**

            }

            @Nullable
            @Override
            @SuppressWarnings("unchecked")
            public <T> T get(@Nonnull Key<T> key) {
                return (T) data.get(key);
            }

            @Nullable
            @Override
            @SuppressWarnings("unchecked")
            public <T> T computeIfAbsent(@Nonnull Key<T> key, @Nonnull Supplier<T> supplier) {

            props.putAll(System.getProperties());
            request.setSystemProperties(props);
        }

        return request;
    }

    @SuppressWarnings("unchecked")
    private List<ArtifactRepository> normalizeToArtifactRepositories(
            List<?> repositories, ProjectBuildingRequest request) throws ProjectBuildingException {
        /*

                } catch (ModelInterpolationException e) {
                    return e;
                }
            }

            return null;
        }

        @SuppressWarnings({"unchecked", "checkstyle:methodlength"})
        private void traverseObjectWithParents(Class<?> cls, Object target) throws ModelInterpolationException {
            if (cls == null) {
                return;
            }

                } else {
                    return null;
                }
            }
        }
        return null;
    }

    @SuppressWarnings("unchecked")
    private ConcurrentMap<Key, PluginVersionResult> getCache(PluginVersionRequest request) {
        SessionData data = request.getRepositorySession().getData();
        return (ConcurrentMap<Key, PluginVersionResult>)

                    <showWarnings>true</showWarnings>
                    <debug>true</debug>
                    <fork>true</fork>
                    <compilerArgs>
                        <arg>-Xlint:unchecked</arg>
                    </compilerArgs>
                    <maxmem>128m</maxmem>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>

    }

    @Override
    @SuppressWarnings({"unchecked"})
    public <T> T computeIfAbsent(String groupId, String artifactId, String version, String tag, Supplier<T> data) {
        return (T) computeIfAbsent(new GavCacheKey(groupId, artifactId, version, tag), data);
    }

    @Override
    @SuppressWarnings({"unchecked"})
    public <T> T computeIfAbsent(Source path, String tag, Supplier<T> data) {

                    }
                    List<Supplier<Object>> list =
                            res3.stream().map(this::compile).collect(Collectors.toList());
                    //noinspection unchecked
                    return () -> (Q) list(list);
                }
                if (key.getRawType() == Map.class) {
                    Key<?> k = key.getTypeParameter(0);

    private final Lookup lookup;

    @Inject
    PropertyContributorExtender(Lookup lookup) {
        this.lookup = lookup;
    }

    @SuppressWarnings({"rawtypes", "unchecked"})
    @Override
    public void extend(MavenExecutionRequest mavenExecutionRequest) {
        Map<String, PropertyContributor> effectivePropertyContributors = lookup.lookupMap(PropertyContributor.class);