Small fixes (upgrade Vala)

src/latex-struct/DocIfaces.vala

@@ -54,8 +54,11 @@ namespace LAview {
 		public virtual IDoc copy () {
 			var clone = create_default_instance ();
 
-			foreach (T dociface in this)
-				clone.add ((dociface as IDoc).copy ());
+			foreach (T dociface in this) {
+				var doc = dociface as IDoc;
+				assert (doc != null);
+				clone.add (doc.copy ());
+			}
 
 			return clone;
 		}
@@ -66,8 +69,11 @@ namespace LAview {
 		public virtual string generate () {
 			var result = new StringBuilder ();
 
-			foreach (T dociface in this)
-				result.append ((dociface as IDoc).generate ());
+			foreach (T dociface in this) {
+				var doc = dociface as IDoc;
+				assert (doc != null);
+				result.append (doc.generate ());
+			}
 
 			return result.str;
 		}

src/latex-struct/Parser.vala

@@ -82,7 +82,7 @@ namespace LAview {
 			/* back-slash counter for one-line comments */
 			protected uint back_slash_counter = 0;
 
-			public Parser (Array<Link> links) {
+			protected Parser (Array<Link> links) {
 
 				/* initializing scanner links */
 				this.links = links;

src/latex-struct/Subtable.vala

@@ -228,7 +228,7 @@ namespace LAview {
 			 * @param line_style {@link Row.OpLineStyle} of the operation.
 			 */
 			public new Row remove_at (int index, Row.OpLineStyle line_style = Row.OpLineStyle.BORDER_DBLLINES) {
-				if (size > 1 && 0 != line_style & Row.OpLineStyle.HBORDER) {
+				if (size > 1 && 0 != (line_style & Row.OpLineStyle.HBORDER)) {
 					if (index == 0)
 						process_border_lines (this[1], this[index], true);
 					else if (index == size - 1)

src/latex-struct/TableParser.vala

@@ -19,7 +19,7 @@ namespace LAview {
 
 			protected bool in_caption = false;
 
-			public TableParser (Array<Link> links) {
+			protected TableParser (Array<Link> links) {
 				base (links);
 
 				group.append_val (new Link ({}, {}));

test/parse-test/ParseTest.vala

@@ -64,10 +64,15 @@ public class Main : Object {
 
 			    unowned Table.Subtable subtable = null;
 
-				if (subdoc is Table.Tabular)
-					subtable = (subdoc as Table.Tabular).table;
-				else
-					subtable = (subdoc as Table.Longtable).table;
+				if (subdoc is Table.Tabular) {
+					var t = subdoc as Table.Tabular;
+					assert (t != null);
+					subtable = t.table;
+				} else {
+					var t = subdoc as Table.Longtable;
+					assert (t != null);
+					subtable = t.table;
+				}
 
 				foreach (var row in subtable) {
 					foreach (var cell in row) {