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This patch adds an RM reference for the rule that in a generic body a type extension cannot have ancestors that are generic formal types. The patch also extends the check to interface progenitors that may appear in a derived type declaration or private extension declaration. 2019-08-13 Ed Schonberg <schonberg@adacore.com> gcc/ada/ * sem_ch3.adb (Check_Generic_Ancestor): New subprogram, aubsidiary to Build_Derived_Record_Type. to enforce the rule that a type extension declared in a generic body cznnot have an ancestor that is a generic formal (RM 3.9.1 (4/2)). The rule applies to all ancestors of the type, including interface progenitors. gcc/testsuite/ * gnat.dg/tagged4.adb: New testcase. From-SVN: r274358
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