* c-typeck.c (enum impl_conv): New.
	(convert_for_assignment): Use it.  Take tree for function called
	instead of its name.  Handle ObjC selectors for diagnostics at
	start of function.  Select diagnostic text within the function
	using full sentences for diagnsotics.  Use %qE to name functions
	in diagnostics.
	(convert_arguments, build_modify_expr,
	c_convert_parm_for_inlining, digest_init, c_finish_return): Update
	callers to convert_for_assignment.
	(warn_for_assignment): Remove.

testsuite:
	* gcc.dg/assign-warn-1.c, gcc.dg/assign-warn-2.c: New tests.
	* gcc.dg/warn-1.c, gcc.dg/noncompile/20020213-1.c,
	objc.dg/method-9.m: Update expected diagnostics.

From-SVN: r88741