tilde.diff

diff --git a/mcs/mcs/cs-parser.jay b/mcs/mcs/cs-parser.jay
index b718931..70051f1 100644
--- a/mcs/mcs/cs-parser.jay
+++ b/mcs/mcs/cs-parser.jay
@@ -2705,6 +2705,22 @@ delegate_declaration
 	  }
 	;
 
+opt_enumerable_or_nullable
+	: opt_enumerable
+	| opt_nullable
+	;
+
+opt_enumerable
+	: /* empty */
+	  {
+		$$ = null;
+	  }
+	| TILDE
+	  {	  
+	  	$$ = ComposedTypeSpecifier.CreateIEnumerable (GetLocation ($1));
+	  }
+	;
+
 opt_nullable
 	: /* empty */
 	  {
@@ -2962,7 +2978,7 @@ type_expression_or_array
 	;
 	
 type_expression
-	: namespace_or_type_name opt_nullable
+	: namespace_or_type_name opt_enumerable_or_nullable
 	  {
 		MemberName name = (MemberName) $1;
 
@@ -2975,7 +2991,7 @@ type_expression
 				$$ = name.GetTypeExpression ();
 		}
 	  }
-	| builtin_types opt_nullable
+	| builtin_types opt_enumerable_or_nullable
 	  {
 		if ($2 != null)
 			$$ = new ComposedCast ((FullNamedExpression) $1, (ComposedTypeSpecifier) $2);
@@ -3594,8 +3610,8 @@ opt_rank_specifier
 	;
 
 opt_rank_specifier_or_nullable
-	: opt_nullable
-	| opt_nullable rank_specifiers
+	: opt_enumerable_or_nullable
+	| opt_enumerable_or_nullable rank_specifiers
 	  {
 		if ($1 != null) {
 			((ComposedTypeSpecifier) $1).Next = (ComposedTypeSpecifier) $2;
diff --git a/mcs/mcs/cs-tokenizer.cs b/mcs/mcs/cs-tokenizer.cs
index 253b1be..dd9c7bc 100644
--- a/mcs/mcs/cs-tokenizer.cs
+++ b/mcs/mcs/cs-tokenizer.cs
@@ -928,6 +928,7 @@ namespace Mono.CSharp
 					continue;
 
 				case Token.INTERR_NULLABLE:
+				case Token.TILDE:
 				case Token.STAR:
 					if (bracket_level == 0)
 						is_type = true;
@@ -1003,7 +1004,7 @@ namespace Mono.CSharp
 				return true;
 			else if (the_token == Token.COMMA || the_token == Token.DOT || the_token == Token.DOUBLE_COLON)
 				goto start;
-			else if (the_token == Token.INTERR_NULLABLE || the_token == Token.STAR)
+			else if (the_token == Token.INTERR_NULLABLE || the_token == Token.STAR || the_token == Token.TILDE)
 				goto again;
 			else if (the_token == Token.OP_GENERICS_LT) {
 				if (!parse_less_than ())
diff --git a/mcs/mcs/expression.cs b/mcs/mcs/expression.cs
index aeb1cba..6a16fd4 100644
--- a/mcs/mcs/expression.cs
+++ b/mcs/mcs/expression.cs
@@ -8412,6 +8412,12 @@ namespace Mono.CSharp {
 			}
 		}
 
+		public bool IsIEnumerable {
+			get {
+				return Dimension == -3;
+			}
+		}
+
 		public ComposedTypeSpecifier Next { get; set; }
 
 		#endregion
@@ -8431,6 +8437,11 @@ namespace Mono.CSharp {
 			return new ComposedTypeSpecifier (-2, loc);
 		}
 
+		public static ComposedTypeSpecifier CreateIEnumerable (Location loc)
+		{
+			return new ComposedTypeSpecifier (-3, loc);
+		}
+
 		public string GetSignatureForError ()
 		{
 			string s =
@@ -8490,6 +8501,9 @@ namespace Mono.CSharp {
 
 				type = PointerContainer.MakeType (type);
 				single_spec = single_spec.Next;
+			} else if (single_spec.IsIEnumerable) {
+				type = TypeManager.generic_ienumerable_type.MakeGenericType (new [] { type });
+				single_spec = single_spec.Next;
 			}
 
 			if (single_spec != null && single_spec.Dimension > 0) {

Just a few lines of code and such a magnificent result.
Just beautiful.