2018-07-31  Ed Schonberg  <schonberg@adacore.com>

gcc/ada/

	* sem_ch4.adb (Traverse_Homonyms): Consider generic actuals that
	may rename a matching class-wide operation only if the renaming
	declaration for that actual is in an enclosing scope (i.e.
	within the corrresponding instance).

From-SVN: r263090