[PATCH] D46446: [c++17] Fix assertion on synthesizing deduction guides after a fatal error.
Volodymyr Sapsai via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Mon May 14 15:53:41 PDT 2018
This revision was automatically updated to reflect the committed changes.
Closed by commit rL332307: [c++17] Fix assertion on synthesizing deduction guides after a fatal error. (authored by vsapsai, committed by ).
Herald added a subscriber: llvm-commits.
Changed prior to commit:
https://reviews.llvm.org/D46446?vs=145251&id=146713#toc
Repository:
rL LLVM
https://reviews.llvm.org/D46446
Files:
cfe/trunk/lib/Sema/SemaTemplate.cpp
cfe/trunk/test/SemaTemplate/instantiate-after-fatal-cxx17.cpp
Index: cfe/trunk/lib/Sema/SemaTemplate.cpp
===================================================================
--- cfe/trunk/lib/Sema/SemaTemplate.cpp
+++ cfe/trunk/lib/Sema/SemaTemplate.cpp
@@ -1976,6 +1976,8 @@
// FIXME: Add a kind for this to give more meaningful diagnostics. But can
// this substitution process actually fail?
InstantiatingTemplate BuildingDeductionGuides(*this, Loc, Template);
+ if (BuildingDeductionGuides.isInvalid())
+ return;
// Convert declared constructors into deduction guide templates.
// FIXME: Skip constructors for which deduction must necessarily fail (those
Index: cfe/trunk/test/SemaTemplate/instantiate-after-fatal-cxx17.cpp
===================================================================
--- cfe/trunk/test/SemaTemplate/instantiate-after-fatal-cxx17.cpp
+++ cfe/trunk/test/SemaTemplate/instantiate-after-fatal-cxx17.cpp
@@ -0,0 +1,16 @@
+// RUN: not %clang_cc1 -std=c++17 -fsyntax-only -ferror-limit 1 %s 2>&1 | FileCheck %s
+
+#error Error 1
+#error Error 2
+// CHECK: fatal error: too many errors emitted, stopping now
+
+namespace rdar39051732 {
+
+ template<class T> struct A {
+ template <class U> A(T&, ...);
+ };
+ // Deduction guide triggers constructor instantiation.
+ template<class T> A(const T&, const T&) -> A<T&>;
+
+}
+
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