[Committed] PR fortran/38351 -- Improved error message

[Committed] PR fortran/38351 -- Improved error message

[Steve Kargl]

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I've committed the attached patch.  It provides a better error
message (IMO) when a derived-type entity is used in a binary
intrinsic numeric operator.

2018-06-09  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/38351
	* resolve.c (resolve_operator): Provide better error message for
	derived type entity used in an binary intrinsic numeric operator.


2018-06-09  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/38351
	* gfortran.dg/pr38351.f90: New test.
	* gfortran.dg/typebound_operator_4.f03: Adjust for new error message.

-- 
Steve

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Index: gcc/fortran/resolve.c
===================================================================
--- gcc/fortran/resolve.c	(revision 261361)
+++ gcc/fortran/resolve.c	(working copy)
@@ -3878,7 +3878,13 @@ resolve_operator (gfc_expr *e)
 	  break;
 	}
 
-      sprintf (msg,
+      if (op1->ts.type == BT_DERIVED || op2->ts.type == BT_DERIVED)
+	sprintf (msg,
+	       _("Unexpected derived-type entities in binary intrinsic "
+		 "numeric operator %%<%s%%> at %%L"),
+	       gfc_op2string (e->value.op.op));
+      else
+      	sprintf (msg,
 	       _("Operands of binary numeric operator %%<%s%%> at %%L are %s/%s"),
 	       gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
 	       gfc_typename (&op2->ts));
Index: gcc/testsuite/gfortran.dg/pr38351.f90
===================================================================
--- gcc/testsuite/gfortran.dg/pr38351.f90	(nonexistent)
+++ gcc/testsuite/gfortran.dg/pr38351.f90	(working copy)
@@ -0,0 +1,21 @@
+! { dg-do compile }
+module m1
+   type t1
+      integer :: i
+   end type t1
+   interface operator(+)
+      module procedure add
+   end interface
+   contains
+      type(t1) function add(a,b)
+         type(t1), intent(in) :: a,b
+      end function
+end module m1
+
+program foo
+   use m1
+   type(t1), dimension(2,2) :: a = t1(1), b = t1(2)
+   type(t1) :: c=t1(1), d=t1(2)
+   c = c + d
+   a = a + b   ! { dg-error "Unexpected derived-type entities" }
+end program foo
Index: gcc/testsuite/gfortran.dg/typebound_operator_4.f03
===================================================================
--- gcc/testsuite/gfortran.dg/typebound_operator_4.f03	(revision 261361)
+++ gcc/testsuite/gfortran.dg/typebound_operator_4.f03	(working copy)
@@ -84,6 +84,6 @@ PROGRAM main
   TYPE(myint) :: x
 
   x = 0 ! { dg-error "Can't convert" }
-  x = x + 42 ! { dg-error "Operands of" }
+  x = x + 42 ! { dg-error "binary intrinsic numeric operator" }
   x = x .PLUS. 5 ! { dg-error "Unknown operator" }
 END PROGRAM main