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New function ‘tryInvokeRestart()’ to invoke a specified restart if one is available and return without signaling an error if no such restart is found. Contributed by Lionel Henry in PR#17598.
New make target ‘distcheck’ checks that: R can be rebuilt from the tarball created by ‘dist’; the tarball build passes ‘check-all’; the build installs and uninstalls ; and the source files are properly cleaned by ‘distclean’.