[CONCEPTS] Parsing of concept keyword

Summary: This change adds parsing for the concept keyword in a
declaration and tracks the location. Diagnostic testing added for
invalid use of concept keyword.

Reviewers: faisalv, fraggamuffin, rsmith, hubert.reinterpretcast

Reviewed By: rsmith, hubert.reinterpretcast

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D10528

Patch by Nathan Wilson!

llvm-svn: 241060

1 files changed, 30 insertions, 0 deletions

diff --git a/clang/test/Parser/cxx-concept-declaration.cpp b/clang/test/Parser/cxx-concept-declaration.cpp
new file mode 100644
index 00000000000..591629ca285
--- /dev/null
+++ b/clang/test/Parser/cxx-concept-declaration.cpp
@@ -0,0 +1,30 @@
+
+// Support parsing of function concepts and variable concepts
+
+// RUN:  %clang_cc1 -std=c++14 -fconcepts-ts -x c++ -verify %s
+
+template<typename T> concept bool C1 = true;
+
+template<typename T> concept bool C2() { return true; }
+
+template<typename T>
+struct A { typedef bool Boolean; };
+
+template<int N>
+A<void>::Boolean concept C3(!0);
+
+template<typename T, int = 0>
+concept auto C4(void) -> bool { return true; }
+
+constexpr int One = 1;
+
+template <typename>
+static concept decltype(!0) C5 { bool(One) };
+
+template<typename T> concept concept bool C6 = true; // expected-warning {{duplicate 'concept' declaration specifier}}
+
+template<typename T> concept concept bool C7() { return true; } // expected-warning {{duplicate 'concept' declaration specifier}}
+
+concept D1 = true; // expected-error {{C++ requires a type specifier for all declarations}}
+
+template<concept T> concept bool D2 = true; // expected-error {{unknown type name 'T'}}