PR fortran/15586
	* arith.c (gfc_arith_error): Change message to include locus.
	(check_result, eval_intrinsic, gfc_int2int, gfc_real2real,
	gfc_real2complex, gfc_complex2real, gfc_complex2complex): Use
	the new gfc_arith_error.
	(arith_error): Rewrite full error messages instead of building
	them from pieces.
	* check.c (must_be): Removed.
	(type_check, numeric_check, int_or_real_check, real_or_complex_check,
	kind_check, double_check, logical_array_check, array_check,
	scalar_check, same_type_check, rank_check, kind_value_check,
	variable_check, gfc_check_allocated, gfc_check_associated,
	gfc_check_cmplx, gfc_check_dcmplx, gfc_check_dot_product,
	gfc_check_index, gfc_check_kind, gfc_check_matmul, gfc_check_null,
	gfc_check_pack, gfc_check_precision, gfc_check_present,
	gfc_check_spread): Rewrite full error messages instead of
	building them from pieces.
	* decl.c (gfc_match_entry): Rewrite full error messages instead
	of building them from pieces.
	* parse.c (gfc_state_name): Remove.
	* parse.h: Remove prototype for gfc_state_name.

From-SVN: r105844