Go patch committed: Traverse types of call expression

[Ian Lance Taylor <iant@golang.org>]

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GCC PR 67968 provides a test case that causes a gccgo crash.  The
crash is because the compiler failed to build the hash and equality
functions required for a type descriptor.  The descriptor is for an
unnamed type that is being returned by a function imported from a
different package.  The unnamed type is being implicitly converted to
an interface type by a return statement.  The fix is to ensure that
the type of a call expression is always traversed.  Bootstrapped and
ran Go testsuite on x86_64-pc-linux-gnu.  Committed to mainline and 5
branch.

Test case sent out for the master testsuite as https://golang.org/cl/16532 .

Ian

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Index: gcc/go/gofrontend/MERGE
===================================================================
--- gcc/go/gofrontend/MERGE	(revision 229636)
+++ gcc/go/gofrontend/MERGE	(working copy)
@@ -1,4 +1,4 @@
-1c1f226662a6c84eae83f8aaec3d4503e70be843
+65ff1d5fb581717229e5c02796d719671a1e8628
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.
Index: gcc/go/gofrontend/expressions.cc
===================================================================
--- gcc/go/gofrontend/expressions.cc	(revision 229541)
+++ gcc/go/gofrontend/expressions.cc	(working copy)
@@ -8608,6 +8608,16 @@ Builtin_call_expression::do_export(Expor
 int
 Call_expression::do_traverse(Traverse* traverse)
 {
+  // If we are calling a function in a different package that returns
+  // an unnamed type, this may be the only chance we get to traverse
+  // that type.  We don't traverse this->type_ because it may be a
+  // Call_multiple_result_type that will just lead back here.
+  if (this->type_ != NULL && !this->type_->is_error_type())
+    {
+      Function_type *fntype = this->get_function_type();
+      if (fntype != NULL && Type::traverse(fntype, traverse) == TRAVERSE_EXIT)
+	return TRAVERSE_EXIT;
+    }
   if (Expression::traverse(&this->fn_, traverse) == TRAVERSE_EXIT)
     return TRAVERSE_EXIT;
   if (this->args_ != NULL)