On Fri, Jul 24, 2015 at 3:27 PM, Nathan Wilson <[email protected]> wrote: > > > On Fri, Jul 24, 2015 at 2:14 PM, Aaron Ballman <[email protected]> > wrote: >> >> On Fri, Jul 24, 2015 at 2:43 PM, Nathan Wilson <[email protected]> >> wrote: >> > nwilson created this revision. >> > nwilson added reviewers: rsmith, faisalv, fraggamuffin, >> > hubert.reinterpretcast. >> > nwilson added a subscriber: cfe-commits. >> > >> > Adding diagnostic for concepts declared as non template (function or >> > variable) >> > >> > http://reviews.llvm.org/D11490 >> >> > >> > Files: >> > include/clang/Basic/DiagnosticSemaKinds.td >> > lib/Sema/SemaDecl.cpp >> > test/SemaCXX/cxx-concept-declaration.cpp >> > >> > Index: test/SemaCXX/cxx-concept-declaration.cpp >> > =================================================================== >> > --- test/SemaCXX/cxx-concept-declaration.cpp >> > +++ test/SemaCXX/cxx-concept-declaration.cpp >> > @@ -15,3 +15,7 @@ >> > struct C { >> > template<typename T> static concept bool D3 = true; // expected-error >> > {{concept declarations may only appear in namespace scope}} >> > }; >> > + >> > +concept bool D4() { return true; } // expected-error {{concept can only >> > be applied to a function or variable template definition}} >> > + >> > +concept bool D5 = true; // expected-error {{concept can only be applied >> > to a function or variable template definition}} >> > Index: lib/Sema/SemaDecl.cpp >> > =================================================================== >> > --- lib/Sema/SemaDecl.cpp >> > +++ lib/Sema/SemaDecl.cpp >> > @@ -4865,6 +4865,12 @@ >> > // C++ Concepts TS [dcl.spec.concept]p1: The concept specifier >> > shall be >> > // applied only to the definition of a function template or >> > variable >> > // template, declared in namespace scope >> > + if (!TemplateParamLists.size()) { >> > + Diag(D.getDeclSpec().getConceptSpecLoc(), >> > + diag::err_concept_decl_non_template); >> > + return nullptr; >> > + } >> > + >> > if (!DC->getRedeclContext()->isFileContext()) { >> > Diag(D.getIdentifierLoc(), >> > diag::err_concept_decls_may_only_appear_in_namespace_scope); >> > Index: include/clang/Basic/DiagnosticSemaKinds.td >> > =================================================================== >> > --- include/clang/Basic/DiagnosticSemaKinds.td >> > +++ include/clang/Basic/DiagnosticSemaKinds.td >> > @@ -1966,6 +1966,8 @@ >> > "use __attribute__((visibility(\"hidden\"))) attribute instead">; >> > >> > // C++ Concepts TS >> > +def err_concept_decl_non_template : Error< >> > + "concept can only be applied to a function or variable template >> > definition">; >> >> Since we are using "concept" as a grammar term, I think we want to >> quote it. Similar diagnostics suggest phrasing like: >> >> "'concept' can only appear on a function template or variable template >> definition" >> >> This also reduces some ambiguity over how "function or variable template" >> binds. >> >> ~Aaron > > > May we apply both this suggestion and Hubert's? So it would be: > > "the 'concept' specifier may only be applied to the definition of a function > or variable template"
I don't have a strong preference, but I think "specifier may only be" is kind of wordy without adding much value. For comparison: def err_inline_non_function : Error< "'inline' can only appear on functions">; def err_noreturn_non_function : Error< "'_Noreturn' can only appear on functions">; def err_virtual_non_function : Error< "'virtual' can only appear on non-static member functions">; def err_explicit_non_function : Error< "'explicit' can only appear on non-static member functions">; ~Aaron > >> >> >> > def err_concept_decls_may_only_appear_in_namespace_scope : Error< >> > "concept declarations may only appear in namespace scope">; >> > def err_function_concept_not_defined : Error< >> > >> > >> > >> > _______________________________________________ >> > cfe-commits mailing list >> > [email protected] >> > http://lists.cs.uiuc.edu/mailman/listinfo/cfe-commits >> > > > _______________________________________________ cfe-commits mailing list [email protected] http://lists.cs.uiuc.edu/mailman/listinfo/cfe-commits
