[PATCH] D49868: [Sema] Fix a crash by completing a type before using it

[Erik Pilkington via Phabricator via cfe-commits]

erik.pilkington created this revision.
erik.pilkington added reviewers: rsmith, rjmccall.
Herald added a subscriber: dexonsmith.

Only apply this exception on a type that we're able to check.

Thanks!
Erik


Repository:
  rC Clang

https://reviews.llvm.org/D49868

Files:
  clang/lib/Sema/SemaInit.cpp
  clang/test/SemaCXX/cxx1z-class-template-argument-deduction.cpp


Index: clang/test/SemaCXX/cxx1z-class-template-argument-deduction.cpp
===================================================================
--- clang/test/SemaCXX/cxx1z-class-template-argument-deduction.cpp
+++ clang/test/SemaCXX/cxx1z-class-template-argument-deduction.cpp
@@ -348,6 +348,20 @@
   };
 }
 
+namespace rdar41903969 {
+template <class T> struct A {};
+template <class T> struct B;
+template <class T> struct C {
+  C(A<T>&);
+  C(B<T>&);
+};
+
+void foo(A<int> &a, B<int> &b) {
+  (void)C{b};
+  (void)C{a};
+}
+}
+
 #else
 
 // expected-no-diagnostics
Index: clang/lib/Sema/SemaInit.cpp
===================================================================
--- clang/lib/Sema/SemaInit.cpp
+++ clang/lib/Sema/SemaInit.cpp
@@ -9130,6 +9130,7 @@
       Expr *E = ListInit->getInit(0);
       auto *RD = E->getType()->getAsCXXRecordDecl();
       if (!isa<InitListExpr>(E) && RD &&
+          isCompleteType(Kind.getLocation(), E->getType()) &&
           isOrIsDerivedFromSpecializationOf(RD, Template))
         TryListConstructors = false;
     }


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