pattern: handle matching non-List node against slice of fields

Author: dominikh

pattern/match.go

@@ -305,6 +305,13 @@ func matchNodeAST(m *Matcher, a Node, b interface{}) (interface{}, bool) {
 		// 'a' is not a List or we'd be using its Match
 		// implementation.
 
+		if len(b) != 1 {
+			return nil, false
+		}
+		return match(m, a, b[0])
+	case []*ast.Field:
+		// 'a' is not a List or we'd be using its Match
+		// implementation
 		if len(b) != 1 {
 			return nil, false
 		}