Disambiguation of '[[':

 * In C++11, '[[' is ill-formed unless it starts an attribute-specifier. Reject
   array sizes and array indexes which begin with a lambda-expression. Recover by
   parsing the lambda as a lambda.
 * In Objective-C++11, either '[' could be the start of a message-send.
   Fully disambiguate this case: it turns out that the grammars of message-sends,
   lambdas and attributes do not actually overlap. Accept any occurrence of '[['
   where either '[' starts a message send, but reject a lambda in an array index
   just like in C++11 mode.

Implement a couple of changes to the attribute wording which occurred after our
attributes implementation landed:
 * In a function-declaration, the attributes go after the exception specification,
   not after the right paren.
 * A reference type can have attributes applied.
 * An 'identifier' in an attribute can also be a keyword. Support for alternative
   tokens (iso646 keywords) in attributes to follow.

And some bug fixes:
 * Parse attributes after declarator-ids, even if they are not simple identifiers.
 * Do not accept attributes after a parenthesized declarator.
 * Accept attributes after an array size in a new-type-id.
 * Partially disamiguate 'delete' followed by a lambda. More work is required
   here for the case where the lambda-introducer is '[]'.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@154369 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 13 insertions, 0 deletions

diff --git a/test/CXX/dcl.dcl/dcl.attr/dcl.attr.grammar/p6.cpp b/test/CXX/dcl.dcl/dcl.attr/dcl.attr.grammar/p6.cpp
new file mode 100644
index 0000000000..f9702ba7cc
--- /dev/null
+++ b/test/CXX/dcl.dcl/dcl.attr/dcl.attr.grammar/p6.cpp
@@ -0,0 +1,13 @@
+// RUN: %clang_cc1 -std=c++11 -verify %s
+
+namespace std_example {
+
+int p[10];
+void f() {
+  int x = 42, y[5];
+  // FIXME: Produce a better diagnostic for this case.
+  int(p[[x] { return x; }()]); // expected-error {{expected ']'}}
+  y[[] { return 2; }()] = 2; // expected-error {{consecutive left square brackets}}
+}
+
+}