Add syntax support for attributes on expressions and all syntax

nodes in statement position.

Extended #[cfg] folder to allow removal of statements, and
of expressions in optional positions like expression lists and trailing
block expressions.

Extended lint checker to recognize lint levels on expressions and
locals.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/libsyntax/parse/token.rs b/src/libsyntax/parse/token.rs
index 5e4449af604..17b7d8dbaec 100644
--- a/src/libsyntax/parse/token.rs
+++ b/src/libsyntax/parse/token.rs
@@ -202,6 +202,7 @@ impl Token {
             Interpolated(NtIdent(..))   => true,
             Interpolated(NtBlock(..))   => true,
             Interpolated(NtPath(..))    => true,
+            Pound                       => true, // for expression attributes
             _                           => false,
         }
     }