[PATCH] D14352: Add diagnostics which fall under [dcl.spec.concept]p5

[Nathan Wilson via cfe-commits]

nwilson created this revision.
nwilson added reviewers: rsmith, faisalv, hubert.reinterpretcast, aaron.ballman.
nwilson added a subscriber: cfe-commits.

Diagnose when a function concept declaration has parameter(s)

http://reviews.llvm.org/D14352

Files:
  include/clang/Basic/DiagnosticSemaKinds.td
  lib/Sema/SemaDecl.cpp
  test/CXX/concepts-ts/dcl.dcl/dcl.spec/dcl.spec.concept/p5.cpp

Index: test/CXX/concepts-ts/dcl.dcl/dcl.spec/dcl.spec.concept/p5.cpp
===================================================================
--- /dev/null
+++ test/CXX/concepts-ts/dcl.dcl/dcl.spec/dcl.spec.concept/p5.cpp
@@ -0,0 +1,7 @@
+// RUN:  %clang_cc1 -std=c++14 -fconcepts-ts -x c++ -verify %s
+
+template<typename T>
+concept bool fcpv(void) { return true; }
+
+template<typename T>
+concept bool fcpi(int i = 0) { return true; } // expected-error {{function concept cannot have any parameters}}
Index: lib/Sema/SemaDecl.cpp
===================================================================
--- lib/Sema/SemaDecl.cpp
+++ lib/Sema/SemaDecl.cpp
@@ -7569,6 +7569,13 @@
         } else {
           Context.adjustExceptionSpec(NewFD, EST_BasicNoexcept);
         }
+
+        // C++ Concepts TS [dcl.spec.concept]p5: A function concept has the
+        // following restrictions:
+        // — The declaration’s parameter list shall be equivalent to an empty
+        //   parameter list.
+        if (FPT->getNumParams() > 0)
+          Diag(NewFD->getLocation(), diag::err_function_concept_with_params);
       }
 
       // C++ Concepts TS [dcl.spec.concept]p2: Every concept definition is
Index: include/clang/Basic/DiagnosticSemaKinds.td
===================================================================
--- include/clang/Basic/DiagnosticSemaKinds.td
+++ include/clang/Basic/DiagnosticSemaKinds.td
@@ -1990,6 +1990,8 @@
 def err_concept_decl_invalid_specifiers : Error<
   "%select{variable|function}0 concept cannot be declared "
   "'%select{thread_local|inline|friend|constexpr}1'">;
+def err_function_concept_with_params : Error<
+  "function concept cannot have any parameters">;
 
 // C++11 char16_t/char32_t
 def warn_cxx98_compat_unicode_type : Warning<


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