P0217R3: Parsing support and framework for AST representation of C++1z

decomposition declarations.

There are a couple of things in the wording that seem strange here:
decomposition declarations are permitted at namespace scope (which we partially
support here) and they are permitted as the declaration in a template (which we
reject).

llvm-svn: 276492

1 files changed, 8 insertions, 1 deletions

diff --git a/clang/lib/Parse/ParseTentative.cpp b/clang/lib/Parse/ParseTentative.cpp
index 7703c33..556fbf3 100644
--- a/clang/lib/Parse/ParseTentative.cpp
+++ b/clang/lib/Parse/ParseTentative.cpp
@@ -74,11 +74,18 @@ bool Parser::isCXXDeclarationStatement() {
 ///
 /// simple-declaration:
 ///   decl-specifier-seq init-declarator-list[opt] ';'
+///   decl-specifier-seq ref-qualifier[opt] '[' identifier-list ']'
+///                      brace-or-equal-initializer ';'    [C++17]
 ///
 /// (if AllowForRangeDecl specified)
 /// for ( for-range-declaration : for-range-initializer ) statement
+///
 /// for-range-declaration: 
-///    attribute-specifier-seqopt type-specifier-seq declarator
+///    decl-specifier-seq declarator
+///    decl-specifier-seq ref-qualifier[opt] '[' identifier-list ']'
+/// 
+/// In any of the above cases there can be a preceding attribute-specifier-seq,
+/// but the caller is expected to handle that.
 bool Parser::isCXXSimpleDeclaration(bool AllowForRangeDecl) {
   // C++ 6.8p1:
   // There is an ambiguity in the grammar involving expression-statements and