fix #369, No completion after UDA

src/server/autocomplete.d

@@ -1215,6 +1215,13 @@ T getExpression(T)(T beforeTokens)
 
 	expressionLoop: while (true)
 	{
+
+		if (i > 0 && beforeTokens[i].type == tok!"identifier" &&
+			beforeTokens[i-1].type == tok!"@" )
+		{
+			return beforeTokens[0 .. 0];
+		}
+
 		switch (beforeTokens[i].type)
 		{
 		case tok!"import":

tests/tc051/expected.txt

@@ -0,0 +1,3 @@
+identifiers
+Foo	s
+float	k

tests/tc051/file.d

@@ -0,0 +1 @@
+enum UDA; struct Foo{} @UDA F

tests/tc051/run.sh

@@ -0,0 +1,5 @@
+set -e
+set -u
+
+../../bin/dcd-client $1 file.d -c29 > actual.txt
+diff actual.txt expected.txt