re PR c++/90173 (ICE: Segmentation fault (in strip_declarator_types))

/cp
2019-04-26  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/90173
	* decl.c (grokdeclarator): Set type to error_mark_node
	upon error about template placeholder type non followed
	by a simple declarator-id.

/testsuite
2019-04-26  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/90173
	* g++.dg/cpp1z/class-deduction66.C: New.

From-SVN: r270603

gcc/cp/ChangeLog

-2018-04-26  Paolo Carlini  <paolo.carlini@oracle.com>
+2019-04-26  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/90173
+	* decl.c (grokdeclarator): Set type to error_mark_node
+	upon error about template placeholder type non followed
+	by a simple declarator-id.
+
+2019-04-26  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	* decl.c (grokdeclarator): Fix value assigned to typespec_loc, use
 	min_location.

gcc/cp/decl.c

@@ -10973,6 +10973,7 @@ grokdeclarator (const cp_declarator *declarator,
       error_at (typespec_loc, "template placeholder type %qT must be followed "
 		"by a simple declarator-id", type);
       inform (DECL_SOURCE_LOCATION (tmpl), "%qD declared here", tmpl);
+      type = error_mark_node;
     }
 
   staticp = 0;

gcc/testsuite/ChangeLog

-2018-04-26  Paolo Carlini  <paolo.carlini@oracle.com>
+2019-04-26  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/90173
+	* g++.dg/cpp1z/class-deduction66.C: New.
+
+2019-04-26  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	* g++.dg/diagnostic/trailing1.C: New.
 

gcc/testsuite/g++.dg/cpp1z/class-deduction66.C

+// PR c++/90173
+// { dg-do run { target c++17 } }
+
+template <typename T> struct A { };
+
+A(int) -> A<int>;
+
+namespace decl {
+  A (*fp)() = 0;  // { dg-error "placeholder" }
+}