Fix a crash-on-invalid when parsing a reference to an invalid auto declaration

  auto x((unknown));
  int& y = x;

would crash because we were not flagging 'x' as an invalid declaration here.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@165675 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 7 insertions, 2 deletions

diff --git a/lib/Parse/ParseDecl.cpp b/lib/Parse/ParseDecl.cpp
index 52bd4166bb..3ef4f38ad0 100644
--- a/lib/Parse/ParseDecl.cpp
+++ b/lib/Parse/ParseDecl.cpp
@@ -1680,6 +1680,7 @@ Decl *Parser::ParseDeclarationAfterDeclaratorAndAttributes(Declarator &D,
     }
 
     if (ParseExpressionList(Exprs, CommaLocs)) {
+      Actions.ActOnInitializerError(ThisDecl);
       SkipUntil(tok::r_paren);
 
       if (getLangOpts().CPlusPlus && D.getCXXScopeSpec().isSet()) {
diff --git a/test/CXX/dcl.dcl/dcl.spec/dcl.type/dcl.spec.auto/p3.cpp b/test/CXX/dcl.dcl/dcl.spec/dcl.type/dcl.spec.auto/p3.cpp
index f732255a8a..e91cacf104 100644
--- a/test/CXX/dcl.dcl/dcl.spec/dcl.type/dcl.spec.auto/p3.cpp
+++ b/test/CXX/dcl.dcl/dcl.spec/dcl.type/dcl.spec.auto/p3.cpp
@@ -86,3 +86,6 @@ namespace PR13293 {
   template void h<double>();
 }
 #endif
+
+auto fail((unknown)); // expected-error{{use of undeclared identifier 'unknown'}}
+int& crash = fail;
diff --git a/test/SemaCXX/warn-unused-variables.cpp b/test/SemaCXX/warn-unused-variables.cpp
index 582701957e..8bf2560417 100644
--- a/test/SemaCXX/warn-unused-variables.cpp
+++ b/test/SemaCXX/warn-unused-variables.cpp
@@ -42,10 +42,11 @@ void test_dependent_init(T *p) {
 }
 
 namespace PR6948 {
-  template<typename T> class X;
+  template<typename T> class X; // expected-note{{template is declared here}}
   
   void f() {
-    X<char> str (read_from_file()); // expected-error{{use of undeclared identifier 'read_from_file'}}
+    X<char> str (read_from_file()); // expected-error{{use of undeclared identifier 'read_from_file'}} \
+                                       expected-error{{implicit instantiation of undefined template 'PR6948::X<char>'}}
   }
 }