* cp/decl.c (shadow_warning): New function.
	(pushdecl): Improve -Wshadow warnings.  Don't give both a warning
	and an error when a block scope decl shadows a parameter.

	* g++.dg/warn/Wshadow-1.C: New tests.
	* g++.old-deja/g++.mike/for3.C: Update.

From-SVN: r46852