Not every module contributes to every runtime.

The core-runtime module defines each runtime:

- The target JVM for the runtime. Each runtime has its own JVM compatibility constraints.
- Some base services that are available to code hosted by the runtime. This varies by runtime.
- Additional constraints. For example, the CLI client runtimes limit the libraries that are available to the code in that runtime, for performance reasons. 

    private final String methodDescriptor;
    private final String containingType;

    /**
     * Was upgradedMethods originally, but got renamed to upgradedAccessors and then to replacedAccessors
     * can be removed once base version will be the one that also uses 'replacedAccessors'.
     */
    @SerializedName(value = "replacedAccessors", alternate = {"upgradedAccessors", "upgradedMethods"})
    private final List<ReplacedAccessor> replacedAccessors;

            against THE LATEST VERSION WHICH IS RELEASED FROM RELEASE BRANCH (from `released-version.json` on this branch)
            AND LOWER THAN CURRENT BASE VERSION (from `version.txt` on this branch).
            The difference must identically match <a href="${apiChangesJsonFile.asFile.path}">accepted-public-api-changes.json</a>, no more, no less - otherwise the task will fail.