2010-10-07  Robert Dewar  <dewar@adacore.com>

	* par-ch3.adb, par-ch6.adb, par-ch7.adb, par-ch9.adb, par-ch10.adb: Add
	Pexp to Pf_Rec constants
	(P_Subprogram): Expression is always enclosed in parentheses
	* par.adb (Pf_Rec): add Pexp flag for parametrized expression
	* sinfo.ads (N_Parametrized_Expression): Expression must be in parens

2010-10-07  Ed Schonberg  <schonberg@adacore.com>

	* sem_ch6.adb (Analyze_Subprogram_Specification): Implement Ada2012
	checks on functions that return an abstract type or have a controlling
	result whose designated type is an abstract type.
	(Check_Private_Overriding): Implement Ada2012 checks on functions
	declared in the private part, if an abstract type is involved.
	* sem_ch12.adb (Analyze_Generic_Subprogram_Declaration): In Ada2012,
	reject a generic function that returns an abstract type.
	* exp_ch5.adb (Expand_Simple_Function_Return): in Ada2012, if a
	function has a controlling access result, check that the tag of the
	return value matches the designated type of the return expression.

From-SVN: r165100